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J. Phys. Soc. Jpn. 77 (2008) 044706 (6 pages)  |Previous Article| |Next Article|  |Table of Contents|
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1/3 Magnetization Anomaly in Triangular Spin Prism

Yugo Oshima1,3, Hiroyuki Nojiri1,3, Keisuke Fukaya2,3, and Toshihiro Yamase2

1Institute for Materials Research, Tohoku University, Sendai 980-8577
2Chemical Resources Laboratory, Tokyo Institute of Technology, Yokohama 226-8503
3CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012

(Received May 28, 2007; Accepted January 28, 2008; Published April 10, 2008)

A high-field magnetization process for the triangular spin prism Na17[Mn6(H2O)2(AsW9O34)2(AsW6O26)]·38H2O, which consists of six Mn2+ ions (S=5/2), has been investigated. The magnetization at low temperature shows a 1/3 plateau around 5.5 T. It is examined by theoretical calculations using exact diagonalization. The experimental results can be reproduced, but only in a restricted parameter range. It implies that the plateau originates from a delicate balance of exchange couplings. We propose that the plateau is stabilized by some external perturbations, such as thermal/quantum fluctuations. ©2008 The Physical Society of Japan

KEYWORDS: spin cluster, triangular prism, 1/3 magnetization plateau, thermal/quantum fluctuations, magnetic anisotropy
URL: http://jpsj.ipap.jp/link?JPSJ/77/044706/
DOI: 10.1143/JPSJ.77.044706


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