Excess conductivity in Y1-2xCaxTbxBa2Cu3O7-delta

被引：33

作者：

Han, SH ^{[1
]}

Lundqvist, P ^{[1
]}

Rapp, O ^{[1
]}

机构：

[1] ROYAL INST TECHNOL,DEPT SOLID STATE PHYS,S-10044 STOCKHOLM,SWEDEN

来源：

PHYSICA C | 1997年 / 282卷

关键词：

D O I：

10.1016/S0921-4534(97)00937-4

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Superconducting fluctuations have been studied in zero magnetic field in sintered samples of Y1-2xCaxTbxBa2Cu3O7-delta by electrical resistivity measurements for x=0, 0.025, and 0.05. The excess conductivity Delta sigma was analysed as a function of reduced temperature epsilon=ln(T/T-C) in the range -5 < In epsilon < -1.5. With decreasing temperature, characteristic cross-overs were found in all samples from 2D to 3D behavior, and at a lower temperature to a critical regime, with characteristic exponents in Delta sigma proportional to epsilon(alpha) Of alpha(i)=-1, alpha(2)=-0.5 and alpha(3) approximate to -0.4 respectively.

引用

页码：1571 / 1572

页数：2