ANISOTROPY ENHANCEMENT BY PR SUBSTITUTION IN Y1-XPRXBA2CU3O7-DELTA SINGLE-CRYSTALS

被引：8

作者：

CHIEN, TR ^{[1
]}

DATARS, WR ^{[1
]}

LIU, JZ ^{[1
]}

LAN, MD ^{[1
]}

SHELTON, RN ^{[1
]}

机构：

[1] UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616

来源：

PHYSICA C | 1994年 / 221卷 / 3-4期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

D O I：

10.1016/0921-4534(94)90249-6

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The coherence length anisotropy ratio gamma of Y1-xPrxBa2Cu3O7-delta superconducting single crystals (x less-than-or-equal-to 0.45) has been measured by the equilibrium torque magnetometry method. The experiments were performed in 1.5 to 2 T fields at temperatures several K below the onset T(c) of superconductivity. The anisotropy gamma value of Y1-xPrxBa2Cu3O7-delta increases with increasing Pr concentration to gamma = 21.5 +/- 1.5 for x = 0.45 from gamma = 9.3 +/- 0.3 for x = 0. The Y1-xPrxBa2Cu3O7-delta system is isostructural with YBa2Cu3O7-delta, and the suppression of T(c) is generally believed to be due to pair breaking and hole localization by the Pr+3 4f-orbital on the CuO2 valence band. The anisotropy increase in Y1-xPrxBa2Cu3O7-delta is compared with the anisotropy increase in the YBa2Cu3-xFexO7-delta system where hole filling in the CuO2 planes is likely involved. The fundamental reason for the anisotropy enhancement is not clear at the present time.

引用

页码：428 / 434

页数：7

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