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AbstractAbstract
[en] Tunneling spectroscopy was performed on in-plane oriented (100)-Y1-XCaXBa2Cu3O7-Y/In tunnel junctions. For underdoped Y1Ba2Cu3O7-Y a zero-bias conductance peak (ZBCP) was observed which did not split down to 4.2K. For optimally doped YBCO a splitting of the ZBCP at zero magnetic field was observed below 6K and a large anisotropy of the splitting was observed as a function of field orientation. The splitting of the ZBCP is strong if the magnetic field is applied parallel to the (001) direction and weak if the field is parallel to the (010) or (100) direction. The splitting shows a large magnetic hysteresis if the magnetic field is parallel to the (001) direction. For Ca-doped TBCO no ZBCP was observed. Instead a sub-gap appeared below 10K, which widened if a magnetic field is applied. The data suggests an order parameter with a complex symmetry that depends on temperature, doping level and magnetic field
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International Conference on Physics and Chemistry of Molecular and Oxide Superconductors, MOS'99; Stockholm (Sweden); 28 Jul - 2 Aug 1999
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[en] Temperature dependence of Hall constant RH and longitudinal resistivity ρxx have been measured in Ca-doped YBCO thin films with varying oxygen contents, with emphasis on the overdoped regime. RH vs. T data present a peak near Tc whose height reduces with doping and disappears at optimal doping. Unexpectedly, the peak reappears above optimal doping with a height that increases with doping. A similar behavior was observed in the parameters that fit cot(θH) vs. T to a parabola. They decrease smoothly with increasing doping in the underdoped region and present a peculiar peak in the overdoped region. This behavior might indicate the crossover to a new regime of transport properties in strongly overdoped HTSC. We discuss the possible origin and implications of these results
Source
LT23: 23. international conference on low temperature physics; Hiroshima (Japan); 20-27 Aug 2002; S0921453402024905; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
[en] The application of the Ginzburg criterion yields for the new high T/sub c/ oxides a broad critical region, with a width of order unity. This width could be reduced in the event of large strong coupling corrections
Source
Wolf, S.A.; Kresin, V.Z. (eds.); p. 293-294; 1987; p. 293-294; Plenum Press; New York, NY (USA); International workshop on novel mechanisms of superconductivity; Berkeley, CA (USA); 22-26 Jun 1987
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AbstractAbstract
No abstract available
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Phys. Rev., B; v. 7(7); p. 3393-3394
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Kresin, V.Z.; Deutscher, G.; Wolf, S.A.
Lawrence Berkeley Lab., CA (USA)1988
Lawrence Berkeley Lab., CA (USA)1988
AbstractAbstract
[en] A key feature of the high T/sub c/ oxides is a very small value of the Fermi energy. This feature leads to peculiar thermodynamic and transport properties in the normal and superconductive state. 24 refs., 1 fig
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May 1988; 9 p; Latin-American conference on high-temperature superconductivity; Rio de Janeiro (Brazil); 5-6 May 1988; CONF-880522--2; Available from NTIS, PC A02/MF A01; 1 as DE88016243; Portions of this document are illegible in microfiche products.
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No abstract available
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Timmerhaus, K.D. (ed.); p. 603-606; 1974; Plenum Publishing Corp; New York; 13. international conference on low temperature physics; Boulder, Colorado, USA; 21 Aug 1972
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AbstractAbstract
[en] Ultrathin films of Indium, Aluminum and Gold, in intimate contact with Germanium, show interesting electrical properties. Due to good wetting properties, continuity is reached at very small thickness. Au films (8-24A) have been found to be superconducting (T/sub c/ similarly ordered 1K) with relatively high critical current density and high critical fields, and to have a reduced number of carriers with a high effective mass. The interplay between disorder and superconductivity is observed as a function of the Au film thickness
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Wolf, S.A.; Kresin, V.Z. (eds.); p. 23-28; 1987; p. 23-28; Plenum Press; New York, NY (USA); International workshop on novel mechanisms of superconductivity; Berkeley, CA (USA); 22-26 Jun 1987
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Conference; Numerical Data
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AbstractAbstract
[en] It is shown that, as in the case of electric motors and generating sets, beyond a certain size it will be more economic for computers to be superconducting. The achieve this a memory element that is both faster and dissipates less power than present semiconductor ones is required. The technological difficulties of building such a memory element based on the principle of superconducting Josephson tunnelling through thin oxide barriers or other weak links are discussed. The alternative possibility of using granular superconductors to provide a memory element consisting of a weak link or bridge linking two superconductors is considered. Such a memory appears to have the basic quality of the tunnelling Josephson junction of high switching speed and is also rugged. Granular superconductors could make the superconducting computer a practical reality. (U.K.)
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New Scientist (London); v. 69(990); p. 491-493
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[en] Andreev reflections have been studied at the interface between a gold tip and La2-xSrxCuO4 (x=0.11, 0.12) single crystals, along the (110) direction. The shape of the I(V) characteristic has been analyzed within the framework of the theory of Tanaka and Kashiwaya, allowing for an anisotropic order parameter. The data cannot be fitted either to a pure isotropic s-wave or pure d-wave symmetry. The best fit is obtained for an anisotropic gap, with Δmax = 15 meV and Δmin = 5 meV
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3. international conference on physics and chemistry of molecular and oxide superconductors; Karlsruhe (Germany); 2-6 Aug 1996; CONF-960808--
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Deutscher, G.
Proceedings of the International Conference on Transport Properties of Superconductors1990
Proceedings of the International Conference on Transport Properties of Superconductors1990
AbstractAbstract
[en] Published in summary form only
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Universidade Federal, Rio de Janeiro, RJ (Brazil). Inst. de Fisica; 82 p; 1990; p. 13; International Conference on Transport Properties of Superconductors; Rio de Janeiro, RJ (Brazil); 29 Apr - 4 May 1990; Available from the Library of Comissao Nacional de Energia Nuclear, RJ, Brazil
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