Thermodynamic properties of the field-induced Neel order of TlCuCl3

Abstract

TlCuCl3 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. From measurements of the specific heat c and the linear thermal expansion alpha_i we calculate the Grueneisen parameter Gamma_i(T)=alpha_i/c. Close to H_{C0} we find a diverging Gamma_i(T->0, in qualitative agreement with theoretical predictions. However, the predicted individual temperature dependencies of alpha(T) and c(T) are not reproduced by our experimental data.

2 pages, 3 figures; Proceedings of ICM'06, Kyoto

References in corpus (5)

• Quantum phase transitions
• Universally diverging Grueneisen parameter and the magnetocaloric effect close to quantum critical points
• Magnon Dispersion in the Field-Induced Magnetically Ordered Phase of TlCuCl3
• Neutron Diffraction Study of the Pressure-Induced Magnetic Ordering in the Spin Gap System TlCuCl${}_3$
• Magnetoelastic Coupling in the Spin-Dimer System TlCuCl${}_3$

Cited by in corpus (1)

• Spin-spin correlations of the spin-ladder compound (C${}_5$H${}_{12}$N)${}_2$CuBr${}_4$ measured by magnetostriction and comparison to Quantum Monte Carlo results