Magnetoelastic Coupling in the Spin-Dimer System TlCuCl3

N. Johannsen, A. Vasiliev, A. Oosawa, H. Tanaka, and T. Lorenz
Phys. Rev. Lett. 95, 017205 – Published 30 June 2005

Abstract

Based on high-resolution measurements of the thermal expansion and the magnetostriction we analyze the magnetoelastic coupling of TlCuCl3. We find that the phase boundary between the low-field spin liquid phase and the magnetic-field-induced Néel phase is extremely sensitive to pressure and would change by about ±185%/GPa depending on the direction of uniaxial pressure. This drastic effect can unambiguously be traced back to the pressure dependencies of the intradimer coupling, whereas changes of the interdimer couplings under pressure play a minor role. The observed strong decrease of the interdimer coupling, when Tl is substituted by K, is therefore not a consequence of chemical pressure.

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  • Received 15 December 2004

DOI:https://doi.org/10.1103/PhysRevLett.95.017205

©2005 American Physical Society

Authors & Affiliations

N. Johannsen1, A. Vasiliev2, A. Oosawa3, H. Tanaka4, and T. Lorenz1,*

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
  • 2Department of Low Temperature Physics, Moscow State University, Moscow 119992, Russia
  • 3Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
  • 4Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan

  • *Electronic address: lorenz@ph2.uni-koeln.de

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Issue

Vol. 95, Iss. 1 — 1 July 2005

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