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06 July 2020
  » arxiv » cond-mat/0609348

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Thermodynamics of the coupled spin-dimer system TlCuCl3 close to a quantum phase transition
T. Lorenz ; S. Stark ; O. Heyer ; N. Hollmann ; A. Vasiliev ; A. Oosawa ; H. Tanaka ;
Date 14 Sep 2006
Subject Strongly Correlated Electrons
AbstractWe present thermal expansion alpha, magnetostriction and specific heat C measurements of al, which shows a quantum phase transition from a spin-gap phase to a Neel-ordered ground state as a function of magnetic field around H_{C0}->4.8T. Using Ehrenfest’s relation, we find huge pressure dependencies of the spin gap for uniaxial as well as for hydrostatic pressure. For T->0 and H->H_{C0} we observe a diverging Grueneisen parameter Gamma(T)=alpha/C, in qualitative agreement with theoretical predictions. However, the predicted individual temperature dependencies alpha(T) and C(T) are not reproduced by our experimental data.
Source arXiv, cond-mat/0609348
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