EVIDENCE FOR BULK OXYGEN IN LA2CUO4+DELTA - SPECIFIC-HEAT STUDIES

被引：9

作者：

ANDRAKA, B ^{[1
]}

AHLHEIM, U ^{[1
]}

KIM, JS ^{[1
]}

FRAUNBERGER, G ^{[1
]}

STEWART, GR ^{[1
]}

MOROSIN, B ^{[1
]}

VENTURINI, EL ^{[1
]}

GINLEY, DS ^{[1
]}

SCHIRBER, JE ^{[1
]}

机构：

[1] SANDIA NATL LABS,ALBUQUERQUE,NM 87185

来源：

PHYSICAL REVIEW B | 1990年 / 42卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.42.10016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Specific-heat measurements of a powder sample of La2CuO4 with 0.13 indicate the presence of bulk oxygen, as determined by transitions at 24, 43.7, and 54.5 K as found in solid O2. A large difference in the cubic specific-heat temperature coefficients of a high-pressure-oxygenated superconducting sample and an ambient-pressure-oxygenated nonsuperconducting sample of La2CuO4 can be attributed to the unbound oxygen. Electronic specific-heat coefficients of the two samples are 2.40.3 and 00.3 mJ/K2 mol, respectively. Effects of bulk oxygen on measured thermodynamic properties of high-temperature superconductors are discussed. © 1990 The American Physical Society.

引用

页码：10016 / 10019

页数：4

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