ENHANCEMENT OF TC TO 60-K IN (PB, CA)SR2(CA, Y)CU2O7-DELTA BY HIGH-PRESSURE OXYGEN TREATMENT AND QUENCHING

被引：16

作者：

LIU, HB

MORRIS, DE

SINHA, APB

CAO, XW

HO, JC

机构：

[1] UNIV CALIF BERKELEY,DEPT MAT SCI,BERKELEY,CA 94704

[2] WICHITA STATE UNIV,NATL INST AVIAT RES,DEPT PHYS,WICHITA,KS 67208

[3] WICHITA STATE UNIV,NATL INST AVIAT RES,DEPT CHEM,WICHITA,KS 67208

来源：

PHYSICA C | 1992年 / 197卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(92)90242-5

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

(Pb, Ca)Sr2(Ca, Y)Cu2Oy which is a 1:2:1:2 compound with a (Pb, Ca)O mixed monolayer has been made superconducting by careful control of heating and annealing procedures at elevated oxygen pressure. There are two essential steps for getting the highest T(c) (T(c) > 60 K): (1) heating at 900-950-degrees-C under high P(O2) approximately 100 bar and (2) fast quenching to room temperature. In a sample so prepared the oxygen content has the stoichiometric value of 7.0, Pb is in the Pb4+ state and T(c) = 60 K. If the sample is slowly cooled under high oxygen pressure it picks up more oxygen, and this excess oxygen reduces T(c) and finally destroys the superconductivity. This behavior is similar to that of the compound (Pb, Cu)Sr2(Ca, Y)Cu2Oy.

引用

页码：101 / 105

页数：5

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