UPPER CRITICAL-FIELD AND CRITICAL CURRENT-DENSITY IN CERAMIC SAMPLES OF PB2SR2Y0.5CA0.5CU3O8+DELTA

被引：11
|
作者：
KOIKE, Y
MASUZAWA, M
SUNAGAWA, H
NOJI, T
KAWABE, H
KOBAYASHI, N
SAITO, Y
机构：
[1] TATSUTA ELECT WIRE & CABLE CO LTD, HIGASHI, OSAKA 578, JAPAN
[2] TOHOKU UNIV, INST MAT RES, SENDAI, MIYAGI 980, JAPAN
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 1990年 / 29卷 / 03期
关键词：
Critical current density; Electrical resistance; High- T[!sub]c[!/sub] oxide superconductor; Pb[!sub]2[!/sub]Sr[!sub]2[!/sub] Y[!sub]0.5[!/sub]Ca[!sub]0.5[!/sub]Cu[!sub]3[!/sub]0[!sub]8+δ[!/sub; Pb[!sub]2[!/sub]Sr[!sub]2[!/sub]ACu[!sub]3[!/sub]0[!sub]8+δ[!/sub]Pb-Sr-Y -Ca-Cu-0; Superconducting fluctuation; Superconducting transition temperature; Thermally activated resistance; Upper critical field;
D O I：
10.1143/JJAP.29.L408
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The electrical resistance of ceramic samples Pb2Sr2Y0.5Ca0.5Cu3O8+δ with zero resistance at 75 K has been measured in magnetic fields up to 21 T. The superconducting transition curve becomes as broad in the field longitudinal to the current direction as in the transverse field. The value of -dHc2/dT is estimated as 1.7–1.8 T/K. The resistive tail in the lower portion of the transition curve is well expressed as ρ=ρ0 exp (-U0/kBT). The critical current density Jc shows hysteresis with respect to the magnetic field sweep, and is as low as 0.1 A ·cm-2 at 4.2 K in magnetic fields between 1 T and 13 T. © 1990 The Japan Society of Applied Physics.
引用
收藏
页码：L408 / L411
页数：4
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