Two-Dimensional Spin Dynamics in the Itinerant Ferromagnet LaCoPO Revealed by Magnetization and 31P-NMR Measurements

被引：15

作者：

Sugawara, Hitoshi ^{[1
]}

Ishida, Kenji ^{[1
,2
]}

Nakai, Yusuke ^{[1
,2
]}

Yanagi, Hiroshi ^{[3
]}

Kamiya, Toshio ^{[3
,4
]}

Kamihara, Yoichi ^{[2
]}

Hirano, Masahiro ^{[4
,5
]}

Hosono, Hideo ^{[3
,4
,5
]}

机构：

[1] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan

[2] JST, TRIP, Tokyo 1020075, Japan

[3] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan

[4] Japan Sci & Technol Agcy JST, ERATO SORST, Yokohama, Kanagawa 2268503, Japan

[5] Tokyo Inst Technol, Frontier Res Ctr, Yokohama, Kanagawa 2268503, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2009年 / 78卷 / 11期

基金：

日本学术振兴会;

关键词：

cobalt pnictide; ferromagnetism; two dimensional; ferromagnetic fluctuations; CRYSTAL-STRUCTURE; SUPERCONDUCTIVITY; FLUCTUATIONS;

D O I：

10.1143/JPSJ.78.113705

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have performed magnetization and P-31-NMR measurements on the itinerant ferromagnet LaCoPO (Curie temperature T-Curie similar to 44 K) with it layered structure in order to investigate spin dynamics in the paramagnetic state. The linear scaling between the Knight shift K at the P site and the bulk susceptibility chi above T-Curie indicates that the P-31 nucleus is suitable for investigating magnetic properties. The temperature and magnetic field dependences of the nuclear spin-lattice relaxation rate divided by the temperature 1/T1T at the P site show characteristic features of itinerant ferromagnets, such as ZrZn2 and Y(Co1-xAlx)(2). In addition, the relationship between 1/T1T and chi above T-Curie suggests that ferromagnetic fluctuations possess a two-dimensional (2D) characteristic. The present data show that LaCoPO is a unique ferromagnet, where the 2D fluctuations anticipated from the crystal structure are predominant down to almost T-Curie.

引用

页数：4

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