Observation of Field-Induced Transverse Neel Ordering in the Spin Gap System TlCuCl3.

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  • Tanaka Hidekazu
    Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551
  • Oosawa Akira
    Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551
  • Kato Tetsuya
    Faculty of Education, Chiba University, Inage-ku, Chiba 263-8522
  • Uekusa Hidehiro
    Department of Chemistry, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551
  • Ohashi Yuji
    Department of Chemistry, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551
  • Kakurai Kazuhisa
    Neutron Scattering Laboratory, Institute for Solid State Physics, The University of Tokyo, Tokai, Ibaraki 319-1106
  • Hoser Andreas
    Hahn-Meitner-Insitut, Glienicker Straße 100, D-14109 Berlin, Germany

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  • Observation of Field-Induced Transverse Néel Ordering in the Spin Gap System TlCuCl<sub>3</sub>

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Abstract

Neutron elastic scattering experiments have been performed on the spin gap system TlCuCl3 in magnetic fields parallel to the b-axis. The magnetic Bragg peaks which indicate the field-induced Néel ordering were observed for the magnetic field higher than the gap field Hg≈ 5.5 T at Q=(h, 0, l) with odd l in the a*-c* plane. The spin structure in the ordered phase was determined. The temperature and field dependence of the Bragg peak intensities and the phase boundary obtained were discussed in connection with a recent theory which describes the field-induced Néel ordering as a Bose-Einstein condensation of magnons.

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