Theory of the magnetic phase diagram of LiHoF4

Article

关键词: LITHIUM HOLMIUM FLUORIDE;    MONTE-CARLO SIMULATIONS;    DIPOLAR INTERACTIONS;    DISORDERED MAGNET;    CRITICAL-BEHAVIOR;    SPIN SYSTEMS;    FERROMAGNETISM;    LIERF4;    TRANSITION;    MODELS;   

DOI  :  10.1103/PhysRevB.70.144411

来源: SCIE

【 摘 要 】

The properties of LiHoF4 are believed to be well described by a long-range dipolar Ising model. We go beyond mean-field theory and calculate the phase diagram of the Ising model in a transverse field using a quantum Monte Carlo method. The relevant Ising degrees of freedom are obtained using a nonperturbative projection onto the low-lying crystal-field eigenstates. We explicitly take the domain structure into account, and the strength of the near-neighbor exchange interaction is obtained as a fitting parameter. The on-site hyperfine interaction is approximately taken into account through a renormalization of the transverse applied magnetic field. Finally, we propose a spectroscopy experiment to precisely measure the most important parameter controlling the location of the phase boundary.

【 授权许可】

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