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  • Articles  (20)
  • resistivity  (10)
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  • 1
    Electronic Resource
    Electronic Resource
    Electron tunneling into high-T c cuprates: The case of Y1−x Pr x Ba2Cu3O7−δ (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 345-348 
    Details
    ISSN: 1572-9605
    Keywords: Tunneling ; Y1−xPrxBa2Cu3O7−δ ; resistivity ; energy gap
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Many different forms of superconducting tunneling have been attempted with the high-T c cuprates. For these studies to be convincing, it is important to assure that elastic tunneling is the dominant conduction mechanism in the structures considered. Some simple criteria to determine whether this is the case are reviewed, and then our results (which satisfy the criteria) on the system Y1−xPrxBa2Cu3O7−δ are discussed. In this study we show that with increasing Pr concentration, the material becomes more gapless.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724566
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature dependence of the infrared optical properties of YBa2Cu3O7: A plasmon damping model (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 481-483 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconductors ; YBa2Cu3O7 ; infrared ; plasmon ; resistivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The temperature dependence observed in the mid- and near-infrared optical properties of YBa2Cu3O7 is explained in terms of the Drude model for free charge carriers. In the Drude model, the linear temperature dependence of the dc resistivity arises from the free charge carriers having a temperature-dependent mean free path. This temperature dependence results in the plasmon contribution to the dielectric constant having a damping coefficient which also varies linearly with temperature. We find that the temperature dependence which is observed in the absorption and reflection spectra of YBa2Cu3O7 is consistent with this simple model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724594
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  • 3
    Electronic Resource
    Electronic Resource
    Anisotropic uniaxial pressure effects in YBa2Cu3O7−δ (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 159-164 
    Details
    ISSN: 1572-9605
    Keywords: Uniaxial pressure dependence ; YBa2Cu3O7−δ ; resistivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We present measurements of the uniaxial pressure dependence ofT c of untwinned YBa2Cu3O7−δ crystals with various oxygen stoichiometries. For all samples investigated,T c decreases for pressure alonga, increases for pressure alongb, and, in oxygen deficient samples, increases strongly for pressure alongc. These results are compared to the behavior found in the La2−x Sr x CuO4 and YBa2Cu4O8 systems. Neither the model of pressure-induced charge transfer nor coupling to orthorhombic distortions can explain all the data. However, the presence of singularities in the electronic density of states close to the Fermi energy is a possible origin of the observed behavior. Our preliminary data on the pressure dependence of thec-axis and in-plane resistivities in twinned crystals are consistent with this view.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730387
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  • 4
    Electronic Resource
    Electronic Resource
    Electronic specific heat of Tl2Ba2CuO6+δ from 2 K to 300 K for 0≤δ≤0.1 (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 261-264 
    Details
    ISSN: 1572-9605
    Keywords: Overdoped Tl2Ba2CuO6+δ ; electronic heat capacity ; resistivity ; pair breaking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Using a high-precision differential technique with a resolution of 1∶104, we have measured the heat capacity of Tl2Ba2CuO6+δ over a temperature range 2–300 K for 0≤δ≤0.1. Anomalies atT c are seen for all superconducting compositions measured, and the results are consistent with a temperature- andδ-independent normal-state electronic termγ n∼0.6 mJ/g-at. K2. The samples with the largerT c 's exhibit strong fluctuations in their specific heat, typical of a highly anisotropic 2D superconductor, but there is some evidence that these fluctuations become weaker atT c falls-consistent with an increase in the coherence length on hole doping. At temperatures below 5 K an upturn in the data is observed which appears to increase in magnitude asT c falls, correlating with the increase in the Curie term of published susceptibility data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730408
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  • 5
    Electronic Resource
    Electronic Resource
    BCS temperature-dependent superconducting energy gap in domain boundaries of melt-textured YBa2Cu3O7 (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 409-414 
    Details
    ISSN: 1572-9605
    Keywords: Ultrasonic attenuation ; weak links ; energy gap ; mixed state
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Attenuation and velocity measurements in low magnetic fields in the superconducting state of a melt-textured sample of YBa2Cu3O7 are reported. Changes in both attenuationα and relative velocitydv/v are observed at the penetration fieldH′ c1 of its domain boundaries. The change indv/v atH′ c1 appears to be proportional to the repulsive force between vortices. The change inα atH′ c1 may be produced by a relaxation process involving superconducting quasiparticles in the vicinity of the normal core of the vortices. Analysis of the relaxation time associated with this process yields a temperature-dependent energy gap which follows the BCS dependence. The relaxation time associated with the process is about 10−11 sec.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724578
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  • 6
    Electronic Resource
    Electronic Resource
    Lattice and spin bipolarons in metal oxides and doped fullerenes (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 599-605 
    Details
    ISSN: 1572-9605
    Keywords: Bipolarous ; spin ; NMR ; Hall effect ; resistivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We extrapolate the BCS theory to the strong electron-phonon and (or) electron-spin fluctuation interaction and show that in the strong-coupling limit the ground state is a charged Bose liquid of lattice and (or) spin bipolarons. Kinetic and thermodynamic properties of charged bosons on a lattice in the normal and superconducting states are discussed, and some evidence for the model is given from NMR, neutron scattering, near-infrared absorption, Hall effect, resistivity, thermal conductivity, isotope effect, heat capacity, and critical magnetic fields of high-T c oxides. The maximum attainableT c is estimated to be in the region of the transition from the Fermi liquid to a charged Bose liquid (polaronic superconductivity). The proposed theory is not restricted by low dimensionality and might be applied to cubic oxides such as the “old” BaPbBiO and to alkali-doped C60 as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00728467
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  • 7
    Electronic Resource
    Electronic Resource
    Low-field behavior of magnetic and transport properties of laser irradiated Nd-Ba-Cu-O ceramic superconductors (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 841-847 
    Details
    ISSN: 1572-9605
    Keywords: Flux pinning ; weak links ; laser-induced defects ; transport critical current density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The low-field behavior of magnetic and transport properties of high-power laser-irradiated (Q-switched ruby laser, 694 nm, 30 ns) Nd-Ba-Cu-O (NBCO) ceramic superconductors prepared by the coprecipitation technique have been investigated. Laser-irradiated NBCO samples contribute significantly to the flux pinning for low applied magnetic fields. A well-defined field valueH′ c was observed for different laser-irradiated samples which is characteristic of a cross-over between regions dominated by the inter- and intragranular effects. The value ofH′ c for a laser-irradiated sample is increased with increasing number of laser pulses. Thermal modeling of laser heating reveals that on irradiation the surface melts up to a depth of 1μm and laser-induced evaporation occurs at energy density 2.5 J/cm2. SEM studies showed grain growth due to laser-induced surface sintering which improves the interconnectivity among the superconducting grain structure and thus attributed to physical densification and consequent reduction in the total number of weak links. The increase of flux trapping and transport critical current density after laser irradiation is determined by the rigidity of the flux line lattice which may be due to the presence of additional pinning centers caused by the creation of laser-induced mobile defects and their clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320880
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on magnetization and microwave properties of gamma-ray-irradiated Sm-Ba-Cu-O superconductors (1993)
    Springer
    Journal of superconductivity 6 (1993), S. 81-85 
    Details
    ISSN: 1572-9605
    Keywords: Gamma-ray irradiation ; transport and magnetic critical current density ; weak links
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Studies on the effect of gamma-ray irradiation on critical transition temperature, transport and magnetic critical current density (at 4.2 K), high-field magnetization (at 4.2 K), and microwave-induced d.c. voltage (inverse a.c. Josephson effect) have been performed on SmBa2Cu3O7−δ ceramic superconducting samples prepared by the coprecipitation technique. Gamma-ray irradiation of the samples was carried out using a60Co source of 103 Ci strength for several hundreds of hours; the dose received by the samples was 80 K rad/h.γ-Ray irradiation was found to have no effect on its structural modification and on the critical transition temperature. However, transport and magnetic critical current density are increased. Irradiation also caused a significant increase in the high-field magnetic hysteresis, which is presumably connected with the creation of radiation-induced mobile defects. An appreciable decrease in the microwave-induced d.c. voltage at 77 K was also observed after irradiation, which suggests that the mobile defects are clustered at the major defect region and thus reduce the total number of weak links. Enhancement of transport and magnetic critical current density may be due to the stronger pinning of flux lines at theγ-ray-induced defect site in SBCO ceramic superconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617805
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  • 9
    Electronic Resource
    Electronic Resource
    Low-field behavior of critical current in Sm1−x −Ba2−Cu3+x −O7−δ ceramic superconductor (1993)
    Springer
    Journal of superconductivity 6 (1993), S. 87-91 
    Details
    ISSN: 1572-9605
    Keywords: Transport critical current ; weak links ; magnetic hysteresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The transport critical currentI c carried by ceramic Sm1−x Ba2−Cu3+x −O7−δ (SBCO) superconducting samples (prepared by the coprecipitation technique using organic carbonate in the presence of stable polymer) in low magnetic fields (0–100 Oe) have been investigated at different temperatures close to the critical transition temperatureT c . A significant reduction of the transport current-carrying capacity has been observed for magnetic fields smaller than the lower critical fieldH cl . A semilog plot of the field dependence of the transport critical current densityJ ct reveals a well-defined field valueH′ c characteristic of a crossover between regions dominated by the inter- and intragranular effects. Microwave measurements show evidence of a reduction in the total number of weak links between the network of the superconducting grain structure for Cu-rich SBCO samples. The enhancement ofJ tc for Cu-rich SBCO samples is due to the increase in hole concentration caused by partial replacement of Sm by Cu which caused physical densification between the network of superconducting grain structure in SBCO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617806
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  • 10
    Electronic Resource
    Electronic Resource
    Resistivity and magnetic susceptibility studies of TlmCan−1Ba2CunOy before and after doping with LiF (1993)
    Springer
    Journal of superconductivity 6 (1993), S. 111-118 
    Details
    ISSN: 1572-9605
    Keywords: LiF-doped TlCaBaCuO ; resistivity ; susceptibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Measurements of the superconducting resistance as a function of temperature were performed using the conventional four-probe method. The transition to complete superconductivity was recorded for samples of (Tl2Ca2Ba2Cu3O10)100−xLiF x (2223) mixed with different LiF ratiosx=0, 2, 4, 5, 6, 8, 10, and 12 wt.%. It was found that the transition temperatureT c was increased up to 5 wt.% of LiF. Further addition of LiF decreasesT c . Therefore, 5 wt.% LiF is the optimum concentration giving a transition temperature of 130 K. Measurements of the superconducting resistance of all the samples except the (1111) compound show that the addition of 5 wt.% LiF increasesT c and decreases the metastable phases. The real part of the a.c. magnetic susceptibilityϰ a.c. is studied using a zero-field cooled mechanism. The temperature dependence ofϰ a.c. for the prepared TlBaCaCuO having stoichiometric composition of (1111), (2223), (2234), and (3245) and that after doping with 5 wt.% LiF showed a broad feature. The transition to the complete diamagnetic state takes place in a broad transition region containing many transition steps, indicating the presence of metastable phases. The addition of LiF decreases the fluctuation in the transition region and its effect in reducing the number of multiphases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617810
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  • 11
    Electronic Resource
    Electronic Resource
    Phase-slip resistivity in high-temperature superconductors: a manifestation of intrinsic nano-granularity (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 67-74 
    Details
    ISSN: 1572-9605
    Keywords: Flux flow ; phase slip ; Josephson junctions ; resistivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Several critical experiments have shown that the so-called “background” magnetoresistance which occurs with no Lorentz force activation is isotropic in thea-b plane. This isotropic resistivity is linked to paradoxical behavior of vortices which cannot be changed by pinning, a result which may imply intrinsic pinning. Nevertheless, a number of flux-flow observations indicate that vortices may also behave as if they were unpinned. An explanation is proposed which states that this behavior arises as a consequence of defects in oxygen ordering in the Cu-O planes of HTSC crystals; this explanation involves segmentation of the Cu-O planes, and Josephson coupling between adjacent segments. The effective junction areas are seen to be very small, with dimensions characteristic of the size of the unit cell. Thermal motion of nano-scale weak links resolves the pinning paradox by inducing phase-slip resistive dissipation. The resulting phase-slip resistivity is shown to have axial symmetry, that is, the resistivity is independent of the angle between the current and the applied field, with both in thea-b plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617998
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  • 12
    Electronic Resource
    Electronic Resource
    Magnetic and microwave properties of Sm1−xBa2Cu3+xO7−δ superconductors at 4.2 K prepared by an organic carbonate coprecipitation route (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 245-250 
    Details
    ISSN: 1572-9605
    Keywords: Magnetic hysteresis ; pinning potentials ; critical current density ; flux creep ; weak links
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Samples of Sm1Ba2Cu3O7−δ and Sm0.95Ba2Cu3.05O7−δ are prepared by a coprecipitation technique using organic carbonates in the presence of stable polymers. The electrical, magnetic, and microwave measurements have been carried out to characterize the materials. Both normal (Sm1Ba2Cu3O7−δ ) and copper-rich (Sm0.95Ba2Cu3.05O7−δ ) samples showed sharp superconducting transitions at 94 K. Lower and upper critical fields of the samples are estimated from magnetization measurements. The critical magnetization current density (J mc ) and pinning force density (F p ) of the samples are obtained from the magnetization hysteresis loop at 4.2 K for fields up to 5T. Superconducting parameters (H c (O),K GL,λ,ξ) are obtained by using the values of lower and upper critical magnetic fields. Microwave-induced d.c. voltage measurements indicated a smaller number of weak links for copper-rich samples. The enhancement of critical current density and the reduction of total number of weak links for copper-rich samples may be due to the increase in hole concentration caused by the partial replacement of Sm by Cu.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617624
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  • 13
    Electronic Resource
    Electronic Resource
    High-field magnetic and transport critical current density of Sm-Ba-Cu-O: Agx superconductors at low temperature (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 471-475 
    Details
    ISSN: 1572-9605
    Keywords: Magnetic critical current density ; transport critical current density ; weak links ; pinning force
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Variation of magnetic critical current density (J mc) and transport critical current density (J tc) in high magnetic fields at liquid helium temperature were investigated on Sm-Ba-Cu-O: Ag x (x=0.0, 0.2, 0.4, and 0.6) superconducting samples prepared by the coprecipitation technique.T c and crystallographic parameters remain unaffected by Ag addition. However, bothJ mc andJ tc were found to increase on Ag addition. The volume pinning force (F p) also increased with increase in Ag concentration, resulting in stronger flux line sheer. Microwave-induced d.c. voltage measurement shows a significant reduction of the total number of weak links between the superconducting grains with increasing concentration of Ag, which creates stronger pinning potentials between the boundary of the superconducting intergrains. Hence, the volume pinning force is greatly enhanced by Ag addition, leading to flux line lattice movement which is responsible for highJ mc andJ tc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620506
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  • 14
    Electronic Resource
    Electronic Resource
    Low-temperature magnetic and electromagnetic studies of Y-Ba-Cu-O: Agx Ceramic superconductor (1991)
    Springer
    Journal of superconductivity 4 (1991), S. 485-488 
    Details
    ISSN: 1572-9605
    Keywords: Magnetic hysteresis ; remanent magnetization ; flux creep ; pinning potentials ; weak links
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Magnetization and magnetic relaxation measurements have been studied at 4.2 K on YBa2Cu3O7−δ:Ag x (x=0 to 1.2) superconducting samples prepared by a coprecipritation technique. Remanent magnetization and hysteresis loops were found to be increased on Ag addition. Transport current density (J c) was enhanced with the addition of Ag concentration. Flux creep rate was also increased with increase in Ag addition resulting in stronger pinning potential. Microwave-induced d.c. voltage measurements show a reduction of weak links with increase in Ag concentration. The enhancement of transportT c is attributed to the stronger Josephson current paths due to the reduction of the total number of weak links after Ag addition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635869
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  • 15
    Electronic Resource
    Electronic Resource
    On dislocation-induced reentrant-like behavior in deoxygenated high-T c superconductors (1991)
    Springer
    Journal of superconductivity 4 (1991), S. 431-435 
    Details
    ISSN: 1572-9605
    Keywords: Dislocation density ; twin boundary ; weak links ; critical current density ; oxygen deficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A possible scenario for dislocation-induced intragrain weak-link generation is proposed. The theory predicts a reentrant-like behavior of the critical current density vs. magnetic field due to the sample deoxygenation. A qualitative agreement with high-T c single crystal anomalies is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635861
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  • 16
    Electronic Resource
    Electronic Resource
    On the characteristic voltage of high-T c superconductors (1991)
    Springer
    Journal of superconductivity 4 (1991), S. 243-245 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconductor ; critical current ; weak links
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The critical currents and normal resistances of the small bridges from yttrium-based high-T c superconducting ceramics have been measured. The characteristic voltage of these bridges was found to be approximately 20 μV. This effect can be explained if, between the ceramic grains, there are contacts of an order of one crystalline cell in size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620793
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  • 17
    Electronic Resource
    Electronic Resource
    Thermoelectric effects in superconductors: The role of fluctuations and weak links (1990)
    Springer
    Journal of superconductivity 3 (1990), S. 417-418 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; thermoelectric effects ; fluctuations ; weak links
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A possible explanation of the well-known discrepancy between the observed and calculated enhancement of a thermal flux induced inside a superconducting loop is presented. The key point, as supposed, is the strong fluctuations nearT c . An excess thermal flux due to weak links is discussed as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617468
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  • 18
    Electronic Resource
    Electronic Resource
    High-temperature properties of the Bi-Sr-Ca-Cu-O system: Simultaneous occurrence of melting, oxygen desorption, and a metal-insulator transition (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 407-415 
    Details
    ISSN: 1572-9605
    Keywords: high-T c superconductivity ; resistivity ; melting ; oxygen desorption ; metal-insulator transition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We have investigated the temperature dependence of the electrical transport and the thermogravimetric properties, from -200°C to +1000Ć, of the Bi-Sr-Ca-Cu-O high-temperature superconductor. We conclude that this system has a cooperative, simultaneous-melting/oxygen desorption/metal-insulator transition that occurs near 900°C. We speculate on its nature and on its relationship to phenomena found in other high-T c superconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618597
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  • 19
    Electronic Resource
    Electronic Resource
    Thermoelectric power measurements of YBa2Cu3O7−δ up to 950°C and their application to test the band structure near EF (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 53-61 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3O7−δ ; resistivity ; thermoelectric power
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Four-probe resistivity (ρ) and thermoelectric power (TEP) measurements were carried out on samples of YBa2Cu3O7−δ up to 950°C, in air and in flowing oxygen at 1 bar. Below 700 K the TEP is small and increases rapidly above it, reaching, at 1200 K, +140μV/K in air and +120μV/K in oxygen. At the changeover temperature (700 K) the slope of logρ vs.T changes abruptly. These results are interpreted in terms of a model of transport of carriers in a narrow band, which is full forδ = 1 and half-filled forδ = 0. Possible origins for such a narrow band are discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617951
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  • 20
    Electronic Resource
    Electronic Resource
    Comparison of Y-Ba-Cu-O compounds prepared from BaCuO2 and Ba2Cu3O5+δ (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 451-461 
    Details
    ISSN: 1572-9605
    Keywords: Y-Ba-Cu-O ; BaCuO2 ; Ba2Cu3O5+δ ; resistivity ; superconducting phases ; baseline hysteresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Series of Y-Ba-Cu-O compositions were prepared from barium cuprates and Y2O3, using a two-step synthesis route. It has been shown that Ba2Cu3O5+δ is essential in formation of the YBa2Cu3O7−δ superconducting phase while BaCuO2 is not an appropriate starting material. A wide composition range fromx=2 to 17 was prepared from Ba2Cu3O5+δ in the YBa x Cu1.5x O z series without disappearance of macroscopic superconductivity atT c〉77 K. Resistivity measurements hint at the existence of two superconducting phases. ESR investigations revealed a baseline hysteresis, depending on the actual value ofx.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618601
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