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Magnetoelastic coupling in the spin-dimer system TlCuCl3.

N Johannsen1, A Vasiliev, A Oosawa

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany.

Physical Review Letters
|August 11, 2005
PubMed
Summary

The magnetoelastic coupling in TlCuCl3 is highly sensitive to pressure, with phase boundaries shifting dramatically under uniaxial stress. This sensitivity is primarily due to changes in intradimer coupling, not interdimer interactions.

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Area of Science:

  • Condensed matter physics
  • Magnetism
  • Materials science

Background:

  • TlCuCl3 exhibits complex magnetic phases, including a low-field spin liquid and a magnetic-field-induced Néel phase.
  • Understanding magnetoelastic coupling is crucial for predicting material behavior under external stimuli.

Purpose of the Study:

  • To investigate the magnetoelastic coupling in TlCuCl3.
  • To quantify the effect of pressure on the phase boundary between the spin liquid and Néel phases.

Main Methods:

  • High-resolution measurements of thermal expansion.
  • High-resolution measurements of magnetostriction.
  • Analysis of magnetoelastic coupling under varying pressure conditions.

Main Results:

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  • The phase boundary is extremely sensitive to pressure, with changes up to +/-185%/GPa under uniaxial stress.
  • This sensitivity is predominantly linked to pressure-dependent intradimer coupling.
  • Interdimer couplings show a minor role in this pressure-induced phase transition.

Conclusions:

  • The drastic pressure dependence of the phase boundary in TlCuCl3 is primarily driven by intradimer coupling.
  • Observed decreases in interdimer coupling upon K substitution are not due to chemical pressure effects.