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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 | | Abstract: | We 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 | | Services: | Forum | Review | PDF | Favorites | |
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