Magnetoelastic Coupling in the Spin-Dimer System TlCuCl${}_3$

Abstract

We present high-resolution measurements of the thermal expansion and the magnetostriction of TlCuCl${}_3$ which shows field-induced antiferromagnetic order. We find pronounced anomalies in the field and temperature dependence of different directions of the lattice signaling a large magnetoelastic coupling. The phase boundary is extremely sensitive to pressure, e.g. the transition field would change by about +/- 185$%/GPa under uniaxial pressure applied along certain directions. This drastic effect can unambiguously be traced back to changes of the intradimer coupling under uniaxial pressure. The interdimer couplings remain essentially unchanged under pressure, but strongly change when Tl is replaced by K.

4 pages with 4 figures included

References in corpus (12)

• Realization of Bose-Einstein condensation of dilute magnons in TlCuCl${}_3$
• Field- and pressure-induced magnetic quantum phase transitions in TlCuCl_3
• Magnon Dispersion in the Field-Induced Magnetically Ordered Phase of TlCuCl3
• Observation of Field-Induced Transverse Néel Ordering in the Spin Gap System TlCuCl${}_3$
• Field-Induced Magnetic Ordering in the Quantum Spin System KCuCl${}_3$
• Field-Induced Magnetic Order in Quantum Spin Liquids
• Universal scaling at field-induced magnetic phase transitions
• Specific Heat Study of the Field-Induced Magnetic Ordering in the Spin Gap System TlCuCl${}_3$
• Sound attenuation on the Bose-Einstein condensation of magnons in TlCuCl_3
• Neutron Diffraction Study of the Pressure-Induced Magnetic Ordering in the Spin Gap System TlCuCl${}_3$
• Field-Induced Magnetic Order and Simultaneous Lattice Deformation in TlCuCl3
• Comparative study between two quantum spin systems KCuCl${}_3$ and TlCuCl${}_3$

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