Magnetostriction in the Bose-Einstein Condensate quantum magnet NiCl2-4SC(NH2)2

Abstract

The quantum magnet NiCl${}_2$-4SC(NH${}_2$)${}_2$ is a candidate for observing Bose-Einstein Condensation of spin degrees of freedom in applied magnetic fields. An XY antiferromagnetic ordered state occurs in a dome-shaped region of the temperature-field phase diagram between H${}_{c1}$ = 2.1 T and H${}_{c2}$ = 12.6 T and below 1.2 K. BEC corresponds to the field-induced quantum phase transition into the ordered state. We investigate magnetostriction in single crystals of this compound at dilution refrigerator temperatures in magnetic fields up to 18 T, and as a function of magnetic field angle. We show that significant changes in the lattice parameters are induced by magnetic fields, and argue that these result from antiferromagnetic couplings between the Ni spins along the tetragonal c-axis. The magnetic phase diagram as a function of temperature, field, and field angle can be extracted from these data. We discuss the implications of these results to Bose-Einstein Condensation in this system.

Submitted to Journal of Applied Physics

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Cited by in corpus (6)

• Low-Temperature Heat Transport in the Low-Dimensional Quantum Magnet NiCl_{2}-4SC(NH_{2})_{2}
• Low temperature thermodynamic properties near the field-induced quantum critical point in DTN
• Spin Dynamics of $NiC{l}_2-4SC(N{H}_2{)}_2$ in the Field-Induced Ordered Phase
• Magnetization and Magnetoscrition of van Vleck antiferromagnets with magnetic anisotropy of "easy-plane" type
• Low-temperature heat transport of spin-gapped quantum magnets
• Neutron diffraction of field-induced magnon condensation in the spin-dimerized antiferromagnet Sr${}_3$Cr${}_2$O${}_8$