Thermal Fluctuations of (Tl0.5Pb0.5)Sr2(Ca0.9Gd0.1)Cu2Oz Bulk Superconductor

被引：3

作者：

Woch, W. M. ^{[1
]}

Chrobak, M. ^{[1
]}

Kolodziejczyk, A. ^{[1
]}

Gritzner, G. ^{[2
]}

机构：

[1] AGH Univ Sci & Technol, Dept Solid State Phys, Fac Phys & Appl Comp Sci, PL-30059 Krakow, Poland

[2] Johannes Kepler Univ Linz, Inst Chem Technol Inorgan Mat, A-4040 Linz, Austria

来源：

ACTA PHYSICA POLONICA A | 2012年 / 121卷 / 5-6期

关键词：

CONDUCTIVITY; YBA2CU3O7-DELTA; BEHAVIOR;

D O I：

10.12693/APhysPolA.121.1059

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the critical fluctuations from the magnetoresistance measurements in polycrystalline (Tl0.5Pb0.5)Sr-2(Ca0.9Gd0.1)Cu2Oz superconductor. The critical exponents have been calculated above the critical temperature T-c as well as in the temperatures interval close to the zero resistance critical temperature. Above T-c only Gaussian fluctuations have been observed in a three-dimensional fluctuating system. Additionally, far above T-c the applied magnetic field induces the crossover from 3D to 2D fluctuating system. At the temperatures range close to the zero critical temperature the properties of the weak links are dominating and the fluctuating phase in each grain becomes long-range ordered as a consequence of the activation of weak links between grains.

引用

页码：1059 / 1062

页数：4

共 18 条

[1] Superconducting fluctuation behavior and infrared absorption properties of Tl1-xCuxSr1.6Yb0.4CaCu2O7-δ and Tl0.5Pb0.5Sr2-yMgyCa0.8Yb0.2Cu2O7-δ ceramics [J].