Low field magnetic response of the granular superconductor La1.8Sr0.2CuO4

被引:0
|
作者
L. Leylekian
M. Ocio
L. A. Gurevich
M. V. Feigel’man
机构
[1] Service de Physique de l’Etat Condensé,
[2] CEA,undefined
[3] CE Saclay,undefined
[4] L. D. Landau Institute for Theoretical Physics,undefined
[5] Institute of Solid State Physics,undefined
[6] Delft University of Technology,undefined
来源
Journal of Experimental and Theoretical Physics | 1997年 / 85卷
关键词
Spectroscopy; Magnetic Field; State Physics; Field Theory; Elementary Particle;
D O I
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中图分类号
学科分类号
摘要
The properties of the low excitation field magnetic response of the granular high-temperature (HTc) superconductor La1.8Sr0.2CuO4 have been analyzed at low temperatures. The response of the Josephson currents has been derived from the data. It is shown that intergrain current response is fully irreversible, producing a shielding response, but that it does not carry Meissner magnetization. Analysis of the data shows that the system of Josephson currents freezes into a glassy state even in the absence of external magnetic field, which is argued to be a consequence of the d-wave nature of superconductivity in La1.8Sr0.2CuO4. The macroscopic diamagnetic response to very weak variations of the magnetic field is shown to be strongly irreversible, but still qualitatively different from any previously known kind of critical-state behavior in superconductors. A phenomenological description of these data is given in terms of a newly proposed fractal model of irreversibility in superconductors.
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页码:1138 / 1156
页数:18
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