THERMAL HISTORY-DEPENDENT SUPERCONDUCTIVITY AND LOCAL-STRUCTURE IN LA2CUO4+DELTA

被引：25

作者：

AHRENS, ET ^{[1
]}

REYES, AP ^{[1
]}

HAMMEL, PC ^{[1
]}

THOMPSON, JD ^{[1
]}

CANFIELD, PC ^{[1
]}

FISK, Z ^{[1
]}

SCHIRBER, JE ^{[1
]}

机构：

[1] SANDIA NATL LABS,ALBUQUERQUE,NM 87185

来源：

PHYSICA C | 1993年 / 212卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(93)90595-H

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

DC magnetic susceptibility measurements reveal a dependence of the superconducting critical temperature (T(c)) on the cooling rate (R) in super-oxygenated La2CuO4+delta. Bulk T(c)'s vary by approximately 4 K depending on whether the sample is ''quenched'' or slow cooled through a narrow temperature range around 195 +/- 10 K. La-139 nuclear quadrupole resonance spectroscopy (NQR) shows the appearance of a feature indicating a distribution of local structures in the metallic phase below approximately 195 K, the same temperature regime where R is critical for T(c). The spectral weight associated with the metallic phase appears to increase for rapid cooling.

引用

页码：317 / 322

页数：6

共 22 条

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