Thermodynamics of the coupled spin-dimer system TlCuCl3 close to a quantum phase transition

Abstract

We present thermal expansion alpha, magnetostriction and specific heat C measurements of \tal, 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.

6 pages including 7 figures, contribution to the III Joint European Magnetic Symposia 2006, San Sebastian

References in corpus (21)

• Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
• Quantum phase transitions
• Realization of Bose-Einstein condensation of dilute magnons in TlCuCl${}_3$
• Experiments on Ladders Reveal a Complex Interplay between a Spin-Gapped Normal State and Superconductivity
• Universally diverging Grueneisen parameter and the magnetocaloric effect close to quantum critical points
• Magnetic light scattering in low-dimensional quantum spin systems
• Field- and pressure-induced magnetic quantum phase transitions in TlCuCl_3
• Divergence of the Grueneisen Ratio at Quantum Critical Points in Heavy Fermion Metals
• Sign change of the Grueneisen parameter and magnetocaloric effect near quantum critical points
• Magnon Dispersion in the Field-Induced Magnetically Ordered Phase of TlCuCl3
• Magnetic excitation spectrum of dimerized antiferromagnetic chains
• Observation of Field-Induced Transverse Néel Ordering in the Spin Gap System TlCuCl${}_3$
• Field-Induced Magnetic Order in Quantum Spin Liquids
• Universal scaling at field-induced magnetic phase transitions
• Spin-resonance modes of the spin-gap magnet TlCuCl_3
• Specific Heat Study of the Field-Induced Magnetic Ordering in the Spin Gap System TlCuCl${}_3$
• Neutron Diffraction Study of the Pressure-Induced Magnetic Ordering in the Spin Gap System TlCuCl${}_3$
• Grueneisen Ratio Divergence at the Quantum Critical Point in CeCu_{6-x}Ag_x
• Magnetoelastic Coupling in the Spin-Dimer System TlCuCl${}_3$
• Field-tuned quantum critical point of antiferromagnetic metals
• Uniaxial pressure dependencies of the phase boundary of TlCuCl_3

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