Observation of Field-Induced Transverse Néel Ordering in the Spin Gap System TlCuCl<sub>3</sub>
Hidekazu TanakaDepartment of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551Akira OosawaDepartment of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551Tetsuya KatoFaculty of Education, Chiba University, Inage-ku, Chiba 263-8522Hidehiro UekusaDepartment of Chemistry, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551Yuji OhashiDepartment of Chemistry, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551Kazuhisa KakuraiNeutron Scattering Laboratory, Institute for Solid State Physics, The University of Tokyo,
Tokai, Ibaraki 319-1106A. Hoser
2001en
ABI
Аннотация
Neutron elastic scattering experiments have been performed on the spin gap system TlCuCl$_3$ in magnetic fields parallel to the $b$-axis. The magnetic Bragg peaks which indicate the field-induced N\'{e}el ordering were observed for magnetic field higher than the gap field $H_{\rm g}\approx 5.5$ 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 N\'{e}el ordering as a Bose-Einstein condensation of magnons.
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