Metallic ferromagnet with square-lattice CoO2 sheets

被引：110

作者：

Matsuno, J ^{[1
]}

Okimoto, Y

Fang, Z

Yu, XZ

Matsui, Y

Nagaosa, N

Kawasaki, M

Tokura, Y

机构：

[1] Natl Inst Adv Ind Sci & Technol, CERC, Tsukuba, Ibaraki 3058562, Japan

[2] AIST, Japan Sci & Technol Corp, ERATO, Spin SuperStruct Project, Tsukuba, Ibaraki 3058562, Japan

[3] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China

[4] Natl Inst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan

[5] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

[6] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.93.167202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A single-crystalline film of Sr2CoO4 with square-lattice CoO2 sheets (K2NiF4-type structure) was synthesized, and its electronic properties were characterized. The compound exhibited both ferromagnetic and metallic behaviors, with a fairly high Curie temperature T-C of similar to250 K, in contrast to the superconductivity recently found in a triangular-lattice CoO2-sheet compound. The film's large magnetoresistance with current perpendicular to the CoO2 plane showed field-hysteretic behavior analogous to tunneling magnetoresistance. The electronic structure of Sr2CoO4 was also investigated to characterize the quasi-two-dimensional ferromagnetic metal state in terms of optical spectroscopy and first-principles calculation.

引用

页码：167202 / 1

页数：4

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