Pressure-induced Magnetic Quantum Phase Transition from Gapped Ground State in TlCuCl_3(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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Magnetization measurements under hydrostatic pressure were performed on an S = 1/2 coupled spin dimer system TlCuCl_3 with a gapped ground state under magnetic field H parallel to the [201] direction. With increasing applied pressure P, the gap decreases and closes completely at P_c = 0.42 ± 0.05 kbar. For P > P_c, TlCuCl_3 undergoes antiferromagnetic ordering. A spin-flop transition was observed at H_<sf> ≃ 0 7 T. The spin-flop field is approximately independent of pressure, although the sublattice magnetization increases with pressure. The gap and Neel temperature are presented as functions of pressure. The occurrence of the pressure-induced quantum phase transition is attributed to the relative enhancement of the interdimer exchange interactions compared with the intradimer exchange interaction.
社団法人日本物理学会の論文
2004-12-15