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Softening of Magnetic Excitations Leading to Pressure-Induced Quantum Phase Transition in Gapped Spin System KCuCl<sub>3</sub>

Kenji GotoDepartment of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551Toyotaka OsakabeQuantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195Kazuhisa KakuraiQuantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195Yoshiya UwatokoInstitute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581Akira OosawaDepartment of Physics, Sophia University, Kioi-cho, Chiyoda-ku, Tokyo 102-8554Jun KawakamiDepartment of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551Hidekazu TanakaDepartment of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551

2007en

ABI

Annotatsiya

KCuCl$_3$ is a three dimensionally coupled spin dimer system, which undergoes a pressure-induced quantum phase transition from a gapped ground state to an antiferromagnetic state at a critical pressure of $P_{\rm c} \simeq 8.2$ kbar. Magnetic excitations in KCuCl$_3$ at a hydrostatic pressure of 4.7 kbar have been investigated by conducting neutron inelastic scattering experiments using a newly designed cylindrical high-pressure clamp cell. A well-defined single excitation mode is observed. The softening of the excitation mode due to the applied pressure is clearly observed. From the analysis of the dispersion relations, it is found that an intradimer interaction decreases under hydrostatic pressure, while most interdimer interactions increase.

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DOI: 10.1143/jpsj.76.053704

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