Magnetic-Field-Induced Condensation Of Triplons In Han Purple Pigment Bacusi2o6
PHYSICAL REVIEW LETTERS(2004)
摘要
Besides being an ancient pigment, BaCuSi2O6 is a quasi-2D magnetic insulator with a gapped spin dimer ground state. The application of strong magnetic fields closes this gap, creating a gas of bosonic spin triplet excitations. The topology of the spin lattice makes BaCuSi2O6 an ideal candidate for studying the Bose-Einstein condensation of triplet excitations as a function of the external magnetic field, which acts as a chemical potential. In agreement with quantum Monte Carlo numerical simulations, we observe a distinct lambda anomaly in the specific heat together with a maximum in the magnetic susceptibility upon cooling down to liquid helium temperatures.
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关键词
quantum monte carlo,quantum statistics,magnetic susceptibility,ground state,bose einstein condensate,magnetic field,specific heat,numerical simulation,chemical potential
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