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J. Phys. Soc. Jpn. 78 (2009) 113705 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Two-Dimensional Spin Dynamics in the Itinerant Ferromagnet LaCoPO Revealed by Magnetization and 31P-NMR Measurements

Hitoshi Sugawara1, Kenji Ishida1,2, Yusuke Nakai1,2, Hiroshi Yanagi3, Toshio Kamiya3,4, Yoichi Kamihara2, Masahiro Hirano4,5, and Hideo Hosono3,4,5

1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502
2TRIP, JST Sanban-cho Building, 5 Sanbancho, Chiyoda, Tokyo 102-0075
3Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503
4ERATO-SORST, Japan Science and Technology Agency (JST), Yokohama 226-8503
5Frontier Research Center, Tokyo Institute of Technology, Yokohama 226-8503

(Received July 28, 2009; Accepted September 7, 2009; Published November 10, 2009)

We have performed magnetization and 31P-NMR measurements on the itinerant ferromagnet LaCoPO (Curie temperature TCurie∼44 K) with a 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 χ above TCurie indicates that the 31P 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 χ above TCurie 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 TCurie. ©2009 The Physical Society of Japan

KEYWORDS: cobalt pnictide, ferromagnetism, two dimensional, ferromagnetic fluctuations
URL: http://jpsj.ipap.jp/link?JPSJ/78/113705/
DOI: 10.1143/JPSJ.78.113705


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