Pressure-Induced Magnetic Quantum Phase Transition in Gapped Spin System KCuCl3

Details Pressure-Induced Magnetic Quantum Phase Transition in Gapped Spin System KCuCl3 Pressure-Induced Magnetic Quantum Phase Transition in Gapped Spin System KCuCl3

2006-02-23

arxiv.org/abs/cond-mat/0602540v2

Physics

Condensed Matter

Statistical Mechanics

7 pages, 10 figures, submitted to J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.75.064703

Magnetization and neutron elastic scattering measurements under a hydrostatic pressure were performed on KCuCl3, which is a three-dimensionally coupled spin dimer system with a gapped ground state. It was found that an intradimer interaction decreases with increasing pressure, while the sum of interdimer interactions increases. This leads to the shrinkage of spin gap. A quantum phase transition from a gapped state to an antiferromagnetic state occurs at Pc ? 8.2 kbar. For P > P c, magnetic Bragg reflections were observed at reciprocal lattice points equivalent to those for the lowest magnetic excitation at zero pressure. This confirms that the spin gap decreases and closes under applied pressure.

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