CALORIMETRIC AND RESISTOMETRIC STUDIES OF LA2CUO4+DELTA SINGLE-CRYSTALS - DISPLASIVE CHARACTER OF PHASE-TRANSITIONS IN 190-310-K

被引：9

作者：

ITOH, M ^{[1
]}

OGUNI, M ^{[1
]}

KYOMEN, T ^{[1
]}

TAMURA, H ^{[1
]}

YU, JD ^{[1
]}

YANAGIDA, Y ^{[1
]}

INAGUMA, Y ^{[1
]}

NAKAMURA, T ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,FAC SCI,DEPT CHEM,MEGURO KU,TOKYO 152,JAPAN

来源：

SOLID STATE COMMUNICATIONS | 1994年 / 90卷 / 12期

关键词：

D O I：

10.1016/0038-1098(94)90243-7

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Measurements of heat capacity, resistivity, and magnetic susceptibility for the La2CuO4+delta single crystals in the range 0.001 less-than-or-equal-to delta less-than-or-equal-to 0.035 revealed that following four kinds of phase transitions appear between 10 and 320 K: superconducting transition around 33 K, a transition around 200 K with small heat anomaly, martensitic transition around at 250-270 K, and a second order transition at 295 K. These transition temperatures strongly depended on the amount of excess oxygen content. The heat capacity anomalies for the sample with delta=0.035 in the range of 190 to 310 K were interpreted as connected with cooperative displacements of ions involving no diffusion process of oxygen ion.

引用

页码：787 / 790

页数：4

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