Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 77, Issue 1, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.77.013701
Keywords
TlCuCl3; spin dimer system; magnons; quantum phase transition; Bose-Einstein condensation; critical behavior
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Magnetization measurements were performed to investigate the critical behavior of the field-induced magnetic ordering in gapped spin system TlCuCl3. 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 Bose-Einstein condensation (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] proportional to T-phi. With decreasing fitting temperature range, the critical exponent phi decreases and converges at phi(BEC) = 3/2 predicted by the magnon BEC theory.
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