Neutron Diffraction Study of the Pressure-Induced Magnetic Ordering in the Spin Gap System TlCuCl3

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  • Oosawa Akira
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Fujisawa Masashi
    Department of Physics, Tokyo Institute of Technology
  • Osakabe Toyotaka
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Kakurai Kazuhisa
    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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  • Neutron Diffraction Study of the Pressure-Induced Magnetic Ordering in the Spin Gap System TlCuCl<sub>3</sub>

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Abstract

Neutron elastic scattering measurements have been performed under a hydrostatic pressure in order to investigate the spin structure of the pressure-induced magnetic ordering in the spin gap system TlCuCl3. Below the ordering temperature TN=16.9 K for the hydrostatic pressure P=1.48 GPa, magnetic Bragg reflections were observed at reciprocal lattice points Q=(h,0,l) with integer h and odd l, which are equivalent to those points with the lowest magnetic excitation energy at ambient pressure. This indicates that the spin gap closes due to the applied pressure. The spin structure of the pressure-induced magnetic ordered state for P=1.48 GPa was determined.

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