Observation of Field-Induced Transverse Néel Ordering in the Spin Gap System TlCuCl${}_3$

Abstract

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 Néel ordering were observed for magnetic field higher than the gap field $H_{\mathrm{g}}\approx 5.5$ T at $Q=(h,0,l)$ with odd $l$ in the $a^{\ast }-c^{\ast }$ 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.

4 pages, 5 eps figures, jpsj style

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