ENHANCED CRITICAL CURRENT-DENSITY IN CA-DOPED Y1BA2CU4O8

被引：7

作者：

NARWANKAR, PK

CHANDRACHOOD, MR

MORRIS, DE

SINHA, APB

机构：

来源：

APPLIED PHYSICS LETTERS | 1991年 / 58卷 / 06期

关键词：

D O I：

10.1063/1.104558

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The J(c) of Ca0.1Y0.9Ba2Cu4O8 (Ca-1:2:4) synthesized in elevated oxygen pressure is found to be > 10(6) A/cm2 at low temperatures and fields, two orders of magnitude greater than the J(c) of undoped Y1Ba2Cu4O8 (1:2:4). The J(c) (determined by magnetic hysteresis measurements) remains high (5 X 10(5) A/cm2) up to B = 4 T at 5 K, and is still > 10(4) A/cm2 at 40 K and 4 T indicating strong flux pinning. At 77 K, J(c) drops to 10(3) A/cm2 at B = 1 T. Ca-1:2:4 was partially converted to 1:2:3 + CuO by brief thermal treatment to generate additional flux pinning centers, but J(c) did not improve further.

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页码：651 / 653

页数：3

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