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

Kenji Goto; Masashi Fujisawa; Hidekazu Tanaka; Yoshiya Uwatoko; Akira Oosawa; Toyotaka Osakabe; Kazuhisa Kakurai

doi:10.1143/JPSJ.75.064703

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

Statistical Mechanics 2009-11-11 v2

Authors: Kenji Goto , Masashi Fujisawa , Hidekazu Tanaka , Yoshiya Uwatoko , Akira Oosawa , Toyotaka Osakabe , Kazuhisa Kakurai

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Abstract

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.

Keywords

KCuCl3 spin dimer system quantum phase transition spin gap hydrostatic pressure antiferromagnetic state

Cite

@article{arxiv.cond-mat/0602540,
  title  = {Pressure-Induced Magnetic Quantum Phase Transition in Gapped Spin System KCuCl3},
  author = {Kenji Goto and Masashi Fujisawa and Hidekazu Tanaka and Yoshiya Uwatoko and Akira Oosawa and Toyotaka Osakabe and Kazuhisa Kakurai},
  journal= {arXiv preprint arXiv:cond-mat/0602540},
  year   = {2009}
}

Comments

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

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

Abstract

Keywords

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