High-field Magnetic Torque Measurements in (CH3)2CHNH3CuCl3
Abstract
High-field magnetic torque measurements were carried out in the spin gap system (CH3)2CHNH3CuCl3. It was observed that the magnitude of the magnetic torque τ is almost zero until the critical field and then increases rapidly, which indicates the existence of the magnetic quantum phase transition from the spin-gap phase to the field-induced magnetic ordered phase. From the temperature dependence of the magnetic torque τ, the cusp-like minimum indicative of the Bose-Einstein condensation (BEC) of magnons was observed for H C-plane, while the kink-anomaly was observed for H A-plane at the field-induced transition temperature. It was found that this different behavior between H A-plane and H C-plane can be interpreted as the breaking of the magnon BEC picture due to the rotational symmetry breaking. The additional anomaly was also observed in the field-induced magnetic ordered phase at the intermediate angle of the applied magnetic field in the A-plane and discussed in terms of the spin-flop transition, the spin-reorientation transition and the spin-lattice correlations. In order to investigate the spin-lattice correlations in (CH3)2CHNH3CuCl3, we performed the magnetostriction measurements and observed that the magnetostriction appears by vanishing of the spin gap.
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