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

Details Magnetoelastic Coupling in the Spin-Dimer System TlCuCl$_3$ Magnetoelastic Coupling in the Spin-Dimer System TlCuCl$_3$

2004-12-16

arxiv.org/abs/cond-mat/0412451v1

Physical Review Letters 95, 017205 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages with 4 figures included

Scientific paper

10.1103/PhysRevLett.95.017205

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.

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