SPECIFIC-HEAT AND PENETRATION DEPTHS OF YBA2CU4O8 AND YBA1.8CA0.2CU4O8 NEAR TC

被引：6

作者：

SCHILLING, A

OTT, HR

GUO, JD

RUSIECKI, S

KARPINSKI, J

KALDIS, E

机构：

[1] Laboratorium für Festkörperphysik, ETH Hönggerberg

来源：

PHYSICA C | 1991年 / 185卷

关键词：

D O I：

10.1016/0921-4534(91)91003-M

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Specific-heat data around the critical temperature T(c) = 90 K of polycrystalline YBa1.8Ca0.2Cu4O8 show a discontinuity DELTA-C(p)/T(c) almost-equal-to 22 mJ/mol K2. In undoped YBa2Cu4O8 and in YBa2Cu3O7, the corresponding anomalies are 15 mJ/mol K2 and 55 mJ/mol K2. The in-plane London penetration depth of the Ca-doped sample, as deduced from isothermal magnetization data, is lambda-ab(0) almost-equal-to 1700 angstrom, compared to lambda-ab(0) almost-equal-to 2000 angstrom in undoped YBa2Cu4O8, and 1400 angstrom in YBa2Cu3O7.

引用

页码：1755 / 1756

页数：2

共 18 条

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