Isomorphic Structural Transition in the β-Pyrochlore Oxide Superconductor KOs2O6

被引：11

作者：

Yamaura, Jun-ichi ^{[1
]}

Takigawa, Masashi ^{[1
]}

Yamamuro, Osamu ^{[1
]}

Hiroi, Zenji ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2010年 / 79卷 / 04期

关键词：

pyrochlore oxide; rattling; structural transition; heat capacity; X-ray diffraction; NMR; CRYSTAL-STRUCTURE;

D O I：

10.1143/JPSJ.79.043601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A phase transition observed at T-p = 7.65 K in the beta-pyrochlore oxide superconductor KOs2O6 is studied by means of heat capacity, K-39-NMR, and X-ray diffraction measurements using high-quality single crystals. We find evidence of an isomorphic structural transition at T-p without the off-center freezing of the K ion even below T-p. It is possibly related to the rattling motion of the K ion in an oversized atomic cage.

引用

页数：4

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