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J. Phys. Soc. Jpn. 73 (2004) pp. 2642-2645  |Next Article|  |Table of Contents|
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Localization of Spin Triplets in Tl1-xKxCuCl3

Yosuke Shindo and Hidekazu Tanaka1

Department of Physics, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8551
1Research Center for Low Temperature Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551

(Received April 20, 2004)

The effect of exchange randomness on field-induced magnetic ordering was investigated through specific heat measurements in Tl1-xKxCuCl3 with x≤0.22. The isostructural parent compounds TlCuCl3 and KCuCl3 are coupled spin dimer systems with a gapped ground state and their field-induced antiferromagnetic ordering is described by the Bose–Einstein condensation (BEC) of spin triplets. Well-defined field-induced phase transitions were observed in Tl1-xKxCuCl3. The critical exponent φ of the phase boundary defined by T(H) ∝(H-Hc)1/φ is reevaluated in TlCuCl3 as φ=1.67 ±0.07, which is close to φBEC =3/2 derived from the magnon BEC theory. For x≠0, the exponent φ decreases systematically with x. The phase boundary observed below 2 K for x>0.1 approximates a linear function of temperature T. In the low-field region for H<Hc, no magnetic ordering is observed despite finite susceptibility. These properties are discussed in connection with the Bose glass phase argued by Fisher et al. [Phys. Rev. B 40 (1989) 546]. ©2004 The Physical Society of Japan

KEYWORDS: TlCuCl3, KCuCl3, Tl1-xKxCuCl3, spin gap, field-induced magnetic ordering, spin triplet, magnon, magnon, Bose–Einstein condensation, randomness, localization, Bose glass
URL: http://jpsj.ipap.jp/link?JPSJ/73/2642/
DOI: 10.1143/JPSJ.73.2642


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