Ca2RuO4: New Mott insulators of layered ruthenate

被引：221

作者：

Nakatsuji, S

Ikeda, SI

Maeno, Y

机构：

[1] Department of Physics, Kyoto University

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1997年 / 66卷 / 07期

关键词：

Ca2RuO4; Sr2RuO4; Mott insulator; band width control; layered perovskite; ruthenate;

D O I：

10.1143/JPSJ.66.1868

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Noncuprate layered perovskite Sr2RuO4 is a highly correlated metal and exhibits superconductivity below T-c approximate to 1.35 K. We have newly synthesized related layered ruthenates Ca2RuO4 in two distinct structural phases with substantially different aspect ratios c/a. Electrical and magnetic measurements show that the two phases are insulating antiferromagnets. We argue that both phases or Ca2RuO4 are Mott insulators. The decrease of the 4d band width in comparison with that of Sr2RuO4, caused by distortions in the RuO2 planes, leads to a Mott-Hubbard-type gap.

引用

页码：1868 / 1871

页数：4

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