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  • Articles  (72)
  • superconductivity  (72)
  • Electrical Engineering, Measurement and Control Technology  (72)
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  • Books
  • Journals
  • Articles  (72)
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  • 1
    Electronic Resource
    Electronic Resource
    Electronic and Phonon Contributions to the Pairing in the Cuprates (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 89-94 
    Details
    ISSN: 1572-9605
    Keywords: Pairing interaction ; superconductivity ; cuprates ; phonon mechanism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Thermal Difference Reflectance (TDR) Spectroscopy has been used to determinethe superconducting gap parameter for several of the superconducting cupratesover a wide range of energies, ω extending from the infrared (0.3 eV)to the ultraviolet (5.3 eV). A contribution to the pairing is found in eachcase from the phonons, and from an electronic excitation with energy thatranges from 1.6 eV and 2.3 eV for the different compounds attributed to thed 9−d 10 L charge-transfer excitation between Cu and O. In every case thereflectance ratio between the superconducting and normal state, Rs/Rnplotted as a function of photon energy can be well described using theEliashberg theory. The theory also predicted a characteristic shape for thelow energy part of such spectra due to the phonons. We report theobservation of this feature in measurements on films of Tl2Ba2CaCu2O8. Wediscuss the significance of the success of the Eliashberg theory inexplaining these results and successfully predicting new effects in thelight of the correlations that had been thought to invalidate such atheoretical approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007733922570
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  • 2
    Electronic Resource
    Electronic Resource
    Anisotropy and Superconductivity in the DMET-TSeF System (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 531-534 
    Details
    ISSN: 1572-9605
    Keywords: Organic superconductor ; superconductivity ; anisotropy ; Fermi surface
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The electronic states have been studied in the quasi-one-dimensional DMET-TSeF system, which includes several superconductors and nonsuperconductors. The origin of the different ground states has been examined by using the tight-binding band calculation. The type of the superconductivity has been discussed, considering the electronic wave functions that constitute the Fermi surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007788319187
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  • 3
    Electronic Resource
    Electronic Resource
    Growth and characterization of evaporated thin films of Y1Ba2Cu3Ox (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 303-311 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3Ox ; evaporation ; films ; superconductivity ; elastic backscattering spectroscopy (EBS)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We have prepared thin films of Y-Ba-Cu-O by coevaporation in the presence of oxygen onto room-temperature substrates, followed by postannealing in oxygen. Films have been grown on (100) SrTiO3, (100) MgO, and LiNbO3. The films have been characterized by electrical resistivity, X-ray diffraction, and elastic backscattering (EBS) measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617719
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  • 4
    Electronic Resource
    Electronic Resource
    The interminable adolescence of superconductivity (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 339-348 
    Details
    ISSN: 1572-9605
    Keywords: superconductivity ; magnetic separation ; magnetic levitation ; supercritical helium ; magneplane ; maglev ; technology crisis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Seventy-seven years after its discovery, superconductivity has failed to mature into a practical technology because we in America have lacked the curiosity to understand it, the imagination to appreciate it, and the spirit of enterprise to develop it. We are about to miss our last chance to regain technical leadership and economic security if we continue to pretend that higher-T c materials alone will change the situation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618592
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  • 5
    Electronic Resource
    Electronic Resource
    Oxygen Configuration in the Superconductor (Hg0.7Mo0.3)Sr2(Ca1−xRx)Cu2Oz (R = Nd and Pr) (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 111-119 
    Details
    ISSN: 1572-9605
    Keywords: superconductivity ; Hg-based cuprate ; Hg-1212 (Hg,Mo)Sr2(Ca,R)Cu2O z ; neutron diffraction ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Two series of Hg-based oxides (Hg0.7Mo0.3)Sr2(Ca1−x R x )Cu2O z (R = Nd and Pr, 0.2 ≤ x ≤ 0.7) have been synthesized. Electrical-resistivity measurements show that these compounds are superconductors with maximum onset T c of 107 and 102 K for Nd- and Pr-containing samples, respectively. The neutron powder diffraction experiments on both as-prepared and O2-annealed samples of R = Nd revealed that the O(3) site at the HgOδ sheets are fully occupied and shifted towards the Hg/Mo site to form Mo–O bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007738528912
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  • 6
    Electronic Resource
    Electronic Resource
    Role of Calcium in the Evolution of Superconductivity in a (La2−xRx)Ba2(CayCu4+y)Oz (R = Y, Er, Gd) System (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 37-40 
    Details
    ISSN: 1572-9605
    Keywords: LaBaCuO ; calcium ; superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract It has been reported that, by adding equal amounts of CaO and CuO to non superconducting La3Ba3Cu6O z (La-336), a series of superconductors with nominal compositions La3Ca y Ba3Cu6+y O z were prepared with maximum Ton c ∼ 80K. Similar studies on addition of CaO and CuO in nonsuperconducting LaBaCu2O z (La-112) resulted into superconducting LaCaBaCu3O z (La-1113). To date no attempt has been made to synthesize La2CaBa2Cu5O z (La-2125) superconducting phase by addition of CaO and CuO to non superconducting La2Ba2Cu4O z (La-224) system. Also no reports are published to study the effect of replacing larger La3+-ions (1.01Å) by smaller rare earth ions viz Y3+(0.89Å), Er3+(0.91Å), Gd3+(0.91Å) on the structural and superconducting properties of (La2−x R x )Ba2(Ca y Cu4+y )O z (LRBCaC); 0.0 ≤ x ≤ 0.5; y=2x system. In this paper, we report the method of synthesis, structural and superconducting property characterization using X-ray diffraction, oxygen content measurements using iodometry, resistivity measurements using d.c. four probe technique and a.c. susceptibility measurements in the temperature range RT to 15K. Also a comparative study, on the evolution of superconducting phase with Ca-concentration for different rare earth substitutions for LRBCaC system in the context of hole doping mechanism, is carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007765907530
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  • 7
    Electronic Resource
    Electronic Resource
    Pressure Dependence of Tc in High Temperature Superconductors: Role of Interlayer Interactions (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 61-68 
    Details
    ISSN: 1572-9605
    Keywords: superconductivity ; pressure dependence ; interlayer interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We have studied the role of interlayer interactions (W) in the pressure dependence of T c of layered superconductors. The expressions for dT c /dP are obtained by including the effects of layered structure within the framework of two different proposed models, namely the negative-U Hubbard model and the Hirsch model. We observe that the inclusion of interlayer interaction provides better explanation of pressure dependence of T c . Our numerical results show that the systems having one CuO2 layer per unit cell may be well described by small values of W while the larger values of W accounts for the systems having two or more superconducting layers in a unit cell. The calculated values of dT c /dP vs. W are found to be in good agreement with those of experimental results obtained for various high T c superconductors of cuprate family.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007722125277
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  • 8
    Electronic Resource
    Electronic Resource
    Lattice and Polarizability Effects on Singlet and Triplet States in an Effective Hamiltonian for High-Tc Cuprates (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 491-496 
    Details
    ISSN: 1572-9605
    Keywords: electron-phonon injection ; superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract From various theoretical approaches it seems to be rather well established that the Zhang–Rice (ZR) singlet state should play an important role in doped high-temperature superconducting (HTSC) oxides. Yet the conclusion that a one-band model is capable of describing many of the unusual physics observed in HTSC compounds has been questioned because the p z states of the oxygen atoms in the planes as well as those of the apical oxygen atoms hybridize with the Cu d3z2-r2 orbitals and induce a mixing of the in-plane states with the out-of-plane bands. It is shown that electron–lattice coupling and polarizability effects modify the electronic structure of the effective Hamiltonian considered here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007727714453
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  • 9
    Electronic Resource
    Electronic Resource
    Pairing, Stripes, Lattice Distortions, and Superconductivity in Cuprate Oxides (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 913-916 
    Details
    ISSN: 1572-9605
    Keywords: superconductivity ; Luttinger liquids ; D-wave pairs ; lattice distortions ; xy models.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We propose a model for a spatially modulated collective state of superconducting cuprates in which the electronic properties vary locally in space. In this model, the regions of higher hole density (called stripes) are described as Luttinger liquids and the regions of lower density (antiferromagnetic ladders) as an interacting bosonic gas of $${\text{d}}_{x^2 - y^2 } $$ hole pairs. We show that the transition to the superconducting state is topologic and driven by decay processes among these elementary excitations in the presence of vibrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026433704326
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  • 10
    Electronic Resource
    Electronic Resource
    Mobile Bipolaron—Strong Coupling Approach (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 999-1003 
    Details
    ISSN: 1572-9605
    Keywords: bipolaron ; polaron ; electron-phonon coupling ; superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We explore the properties of the bipolaron in a 1D Holstein–Hubbard model with dynamical quantum phonons. We apply strong coupling theory to investigate the intersite bipolaron. We investigate the influence of the Hubbard interaction on the bipolaron binding energy, effective mass, and phase diagram. We compare our analytic results to recent numerical calculations [1]. In the intermediate and strong coupling regimes, a bipolaron is stable beyond the naive stability limit U 0 = 2ωg 2. The intersite bipolaron has a significantly reduced mass compared to the single site bipolaron, and is stable in the strong coupling regime up toU c ∼ 4ωg 2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026466711595
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