Thermal boundary between normal conductivity and fluctuation superconductivity in YBa2Cu3O7-δ

被引：0
|
作者：
Vladimirova, NM [1 ]
Drobin, VM
Vuong, NV
机构：
[1] Joint Inst Nucl Res, Dubna 141980, Russia
[2] Inst Phys & Tech Problems, Dubna 141980, Russia
来源：
SUPERLATTICES AND MICROSTRUCTURES | 1998年 / 23卷 / 05期
关键词：
fluctuation superconductivity; YBa2Cu3O7-delta; temperature T-f;
D O I：
10.1006/spmi.1996.0482
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The absence of a linear behaviour of the dependence of the resistance R(T) over a temperature interval 77-300 K was observed for ceramic superconductors YBa2CU3O7-delta and thick polycrystalline films of the same composition with the addition of silver. A comparative analysis of the excess conductivity for HTSC and metal samples, characterizing the deviation R(T) from a linear dependence, allows one to determine the onset temperature of fluctuation superconductivity: within 105-110 K. The analysis of fluctuation superconductivity is performed using the Aslamazov-Larkin model. A smooth transition from the one-dimensional to the two-and three-dimensional nature of superconducting fluctuations in the order parameter was observed for ceramic samples as the temperature decreased. (C) 1998 Academic Press Limited.
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页码：1143 / 1147
页数：5
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