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  • Articles  (17)
  • resistivity  (10)
  • YBa2Cu3O7−δ  (9)
  • Springer  (17)
  • 1990-1994  (12)
  • 1985-1989  (5)
  • 1960-1964
  • 1950-1954
  • Electrical Engineering, Measurement and Control Technology  (17)
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  • Articles  (17)
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  • Springer  (17)
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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
    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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  • 6
    Electronic Resource
    Electronic Resource
    Origins of conductive losses at microwave frequencies in YBa2Cu3O7−δ/LaAlO3/YBa2Cu3O7−δ trilayers deposited by pulsed laser deposition (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 965-969 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3O7−δ ; pulsed laser deposition ; LaAlO3 ; microwave surface resistance ; thin film microstructure ; TEM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Oriented YBa2Cu3O7−δ/LaAlO3/YBa2Cu3O7−δ trilayers were deposited by pulsed laser deposition (PLD) onto 〈100〉 MgO and LaAlO3. Film thicknesses varied from 2000–5000 Å/ layer. A comparision of structure and transport data for the bottom and top superconducting layers indicated a slight decrease in film quality for the top superconducting layer. The critical temperature was lower for the top superconducting layer (90.5 vs. ∼90 K) and the microwave surface resistance was higher (increasing from ∼2 to 18 mω at 36 GHz, 20 K). The resistivity of the dielectric was estimated to be 106 ω cm, and the loss tangent of the dielectric film at microwave frequencies had an upper limit of 0.01. Cross-sectional TEM analysis of the trilayer structure showed a high density of threading dislocations in the dielectric layer that appeared to nucleate at steps in the underlying superconducting layer. The threading dislocations may serve as conduction paths in the LaAlO3 layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00732280
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  • 7
    Electronic Resource
    Electronic Resource
    The origin of melt-texture crystal growth process in a simple tube furnace (1993)
    Springer
    Journal of superconductivity 6 (1993), S. 247-254 
    Details
    ISSN: 1572-9605
    Keywords: Melt-texture growth ; YBa2Cu3O7−δ
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The melt-texture growth (MTG) method has been shown to be effective in fabricating high-T csuperconducting bulk samples with highly oriented layers of single crystals. The critical current densityJ cof the typical samples are enhanced significantly. Furthermore, making use of the nonzero spatial temperature gradient at certain locations of a common tube furnace, we fabricated Y-123 bulk samples with various dopants allowingJ cup to ≈3.0×104 A cm−2 in our recent investigations. We followed up our project by analyzing the relations among the crucial parameters involved in the modified version of the MTG process. These parameters include the temperature gradient, the time rate of change of temperature, the “growth front” of the crystal, etc. Our study indicates that some of the empty space regions that appear between layers are only shallow “gap lines.” True layers of single crystals do exist, and we present an explanation for the growth of crystal layers along special directions as observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626265
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  • 8
    Electronic Resource
    Electronic Resource
    On crystal alignment in polycrystalline YBCO materials based on TEM observation (1993)
    Springer
    Journal of superconductivity 6 (1993), S. 327-334 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3O7−δ ; transmission electron microscope ; grain alignment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Previously, we have observed that parallel lattice fringes show up regularly in MTG samples, indicative of good alignment of unit cells in strips of size ∼ 100 nm × a few times 100 nm. We have prepared films (∼ 80 nm) for TEM observation using YBCO material fabricated by the conventional solid-state reaction method in order to study the crystal texture in a length scale from a few 100 nm down to ∼3 Å. Parallel lattice fringes are observed to stretch across a cross-section ∼0.3×0.5 μm2. Cross lattice fringes intersecting at 90° and 45° are observed as rare events. This result suggests that the degree of alignment in the crystal texture is higher than expected inside a grain of size ∼ a few μm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617480
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  • 9
    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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  • 10
    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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  • 11
    Electronic Resource
    Electronic Resource
    Survey of microwave surface impedance data of high-T c superconductors—Evidence for nonpairing charge carriers (1990)
    Springer
    Journal of superconductivity 3 (1990), S. 235-242 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3O7−δ ; microwave ; surface resistance ; penetration depth ; two-fluid model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The microwave surface impedance of the high-T c oxide superconductors has been measured at many laboratories around the world. A survey of their data between 100 MHz and 150 GHz for polycrystalline as well as single crystalline samples is given, focusing on YBa2Cu3O7−δ . In comparison to the classical superconductors, these results reveal a very similar temperature dependence of the surface impedance close toT c but an anomalous high residual surface resistance at lower temperatures. Both features can be explained by the assumption that oxide superconductors contain a significant number of nonpairing charge carriers. Within the framework of a properly extended two-fluid model, this is shown by analysis of our best thin-film data. Moreover, the enhanced losses in polycrystalline material especially for superposed magnetostatic fields result, to a large extent, from the deeper penetration depth. The possible origin of the nonpairing charge carriers and their impact on the applicability of the oxide superconductors is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00625263
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  • 12
    Electronic Resource
    Electronic Resource
    Consequences of the formation of Cooper-pairs near oxygen-deficient sites (1990)
    Springer
    Journal of superconductivity 3 (1990), S. 395-403 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconductivity ; oxygen deiects ; electron-phonon interaction ; YBa2Cu3O7−δ
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In this investigation we consider the formation of Cooper pairs near the oxygen-deficient sites in Y-Ba-Cu-O ceramic superconductors which would give rise to an energy-dependent potential as seen by conduction charge carriers. It is shown that Cooper pairs could be formed under such conditions, resulting in a supercurrent. We use the Bogoliubov transformation technique to calculate the energy gap, the energy difference, and the transition temperature of the model superconductor using certain data obtained from previous experiments. Numerical analysis shows that the superconducting current can be explained by the presence of such oscillating Cooper pairs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617465
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  • 13
    Electronic Resource
    Electronic Resource
    Structural commonalities of high-temperature superconductors (1989)
    Springer
    Journal of superconductivity 2 (1989), S. 369-386 
    Details
    ISSN: 1572-9605
    Keywords: Structure ; Ba(Pb1−x Bi x )O3 ; YBa2Cu3O7−δ ; possible new superconductors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract It is shown that all of the presently known high-temperature superconductors belong to one structural type with a basic cell of approximate 4/mmm,D 4h symmetry in tetragonal compounds andmmm,D 2h symmetry in orthorhombic compounds. In the Ba(Pb1−xBi x )O3 and YBa2Cu3O7−δ compounds the basic cell is the unit cell and in the (La1−x Sr x )2CuO4, BiSrCaCuO and TIBaCaCuO compounds it is half the unit cell. The features of more than one copper oxide layer per basic cell, oxygen-free cation layers (e.g., Ca, Y) between CuO2 layers, and slightly puckered CuO2 planes seem to favor higher transition temperatures. The feasibility of several proposed or potentially superconducting structures are analyzed by this scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618524
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  • 14
    Electronic Resource
    Electronic Resource
    Atomic structure of grain boundaries and surfaces in YBa2Cu3O7−δ and LaBaCaCu3O7−δ (1989)
    Springer
    Journal of superconductivity 2 (1989), S. 337-349 
    Details
    ISSN: 1572-9605
    Keywords: Grain boundaries ; electron microscopy ; YBa2Cu3O7−δ ; LaBaCaCu3O7−δ
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract High-resolution electron microscopy (HREM) studies of grain boundaries and fractured surfaces in both the tetragonal and orthorhombic phases of dense (〉90%) YBa2Cu3O7−δ and tetragonal LaBaCaCu3O7−δ have been conducted. Grain boundaries in polycrystalline YBa2Cu3O7−δ are found to be frequently parallel to a (001) plane of one of the adjacent grains, with a structure similar to that of the (001) surface of fractured YBa2Cu3O7-gd. Matching of experimental and calculated images shows that the outermost surface layer in this compound is a deformed BaO layer. Both grain boundaries and fractured surfaces in LaBaCaCu3O7−δ show no such tendency for preferential orientation of the interface plane. Results indicate that the low critical currents observed in sintered materials are caused by textured grain growth in combination with the atomic structure of the grain boundary plane, and the intercalation of off-stoichiometric species near the grain boundary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618521
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  • 15
    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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  • 16
    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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  • 17
    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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