Pressure-Induced Successive Magnetic Phase Transitions in the Spin Gap System TlCuCl<sub>3</sub>

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  • Oosawa Akira
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Kakurai Kazuhisa
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Osakabe Toyotaka
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Nakamura Mitsutaka
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Takeda Masayasu
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Tanaka Hidekazu
    Research Center for Low Temperature Physics, Tokyo Institute of Technology

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  • Pressure-Induced Successive Magnetic Phase Transitions in the Spin Gap System TlCuCl3

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Under the hydrostatic pressure P=1.48 GPa, polarized neutron elastic scattering experiments have been carried out on the coupled spin dimer system TlCuCl3 with the gapped ground state at ambient pressure. Pressure-induced magnetic ordering occurs at the transition temperature TN=16.9 K. As in the field-induced and impurity-induced magnetic ordered phases, the ordered moments lie in the a–c plane just below TN. An additional spin reorientation (SR) phase transition was observed at TSR=10 K, where the ordered moments start to incline toward the b-axis. The temperature variations of the direction and the magnitude of the ordered moments were also investigated.

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