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J. Phys. Soc. Jpn. 77 (2008) 013701 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Magnetic-Field Induced Bose–Einstein Condensation of Magnons and Critical Behavior in Interacting Spin Dimer System TlCuCl3

Fumiko Yamada, Toshio Ono, Hidekazu Tanaka, Grégoire Misguich1, Masaki Oshikawa2, and Toshiro Sakakibara2

Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551
1Service de Physique Théorique, CEA-Saclay, 91191 Gif-sur-Yvette Cédex, France
2Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581

(Received October 30, 2007; Accepted November 9, 2007; Published December 25, 2007)

Magnetization measurements were performed to investigate the critical behavior of the field-induced magnetic ordering in gapped spin system TlCuCl3. The critical density of the magnons was obtained as a function of temperature and the magnon-magnon interaction constant was evaluated. The experimental phase boundary for T < 5 K agrees almost perfectly with the magnon Bose–Einstein condensation (BEC) theory based on the Hartree–Fock approximation with realistic dispersion relations. The phase boundary can be described by the power law [HN(T)-Hc] ∝Tφ. With decreasing fitting temperature range, the critical exponent φ decreases and converges at φBEC = 3/2 predicted by the magnon BEC theory. ©2008 The Physical Society of Japan

KEYWORDS: TlCuCl3, spin dimer system, magnons, quantum phase transition, Bose–Einstein condensation, critical behavior
URL: http://jpsj.ipap.jp/link?JPSJ/77/013701/
DOI: 10.1143/JPSJ.77.013701


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