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

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

2001-01-18

arxiv.org/abs/cond-mat/0101276v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 eps figures, jpsj style

Scientific paper

10.1143/JPSJ.70.939

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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