Magnetic-Field Induced Bose-Einstein Condensation of Magnons and Critical Behavior in Interacting Spin Dimer System TlCuCl${}_3$

Abstract

Magnetization measurements were performed to investigate the critical behavior of the field-induced magnetic ordering in gapped spin system TlCuCl${}_3$. The critical density of the magnons was obtained as a function of temperature and the magnon-magnon interaction constant was evaluated. The experimental phase boundary for $T<5$ K agrees almost perfectly with the magnon BEC theory based on the Hartree-Fock approximation with realistic dispersion relations. The phase boundary can be described by the power law $[H_N(T)-H_c]propto{T}^{phi}$. With decreasing fitting temperature range, the critical exponent $phi$ decreases and converges at $ph{i}_{BEC}=3/2$ predicted by the magnon BEC theory.

5 pages, 6 figures, to appear in J. Phys. Soc. Jpn. Vol.77 No.1

References in corpus (3)

• Dimensional reduction at a quantum critical point
• Bose-Einstein Condensation of Magnons in TlCuCl3: Phase diagram and specific heat from a self-consistent Hartee-Fock calculation with a realistic dispersion relation
• Field-driven phase transitions in a quasi-two-dimensional quantum antiferromagnet

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