Two-Dimensional Spin Dynamics in the Itinerant Ferromagnet LaCoPO Revealed by Magnetization and 31P-NMR Measurements
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概要
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We have performed magnetization and 31P-NMR measurements on the itinerant ferromagnet LaCoPO (Curie temperature $T_{\text{Curie}}\sim 44$ 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 $\chi$ above $T_{\text{Curie}}$ 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 $1/T_{1}T$ at the P site show characteristic features of itinerant ferromagnets, such as ZrZn2 and Y(Co1-xAlx)2. In addition, the relationship between $1/T_{1}T$ and $\chi$ above $T_{\text{Curie}}$ 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 $T_{\text{Curie}}$.
- 2009-11-15
著者
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Hirano Masahiro
Erato-sorst Japan Science And Technology Agency (jst) In Frontier Research Center Tokyo Institute Of
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Hosono Hideo
Materials And Structures Laboratory Tokyo Institute Of Technology
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Kamiya Toshio
Materials And Structures Laboratory Tokyo Institute Of Technology
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Nakai Yusuke
Department Of Materials Science And Engineering Graduate School Of Engineering Nagoya Institute Of T
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Yanagi Hiroshi
Materials And Structures Laboratory Tokyo Institute Of Technology
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Ishida Kenji
Department Of Chemical Science And Engineering Graduate School Of Engineering Kobe University
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SUGAWARA Hitoshi
Department of Mathematical and Natural Sciences, Faculty of Integrated Arts and Sciences, The University of Tokushima
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Yanagi Hiroshi
Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503
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Kamihara Yoichi
TRIP, JST Sanban-cho Building, 5 Sanbancho, Chiyoda, Tokyo 102-0075
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Kamiya Toshio
Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503
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Hosono Hideo
Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503
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Hirano Masahiro
ERATO-SORST, Japan Science and Technology Agency (JST), Yokohama 226-8503
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Sugawara Hitoshi
Department of General Internal Medicine, Omiya Medical Center, Jichi Medical University
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Ishida Kenji
Department of Applied Chemistry, Ibaraki University
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