Degeneracy and strong fluctuation-induced first-order phase transition in the dipolar pyrochlore antiferromagnet

Article

关键词: GEOMETRICALLY FRUSTRATED ANTIFERROMAGNET;    4-COMPONENT VECTOR MODELS;    PHYSICAL REALIZATIONS;    EPSILON-EXPANSION;    TEMPERATURE;    GD2TI2O7;    ORDER;    GD2SN2O7;   

DOI  :  10.1103/PhysRevB.72.184408

来源: SCIE

【 摘 要 】

We show that a continuous set of degenerate critical soft modes strongly enhances the first-order character of a fluctuation-induced first-order transition in the pyrochlore dipolar Heisenberg antiferromagnet. Such a degeneracy seems essential to explain the strong first-order transition recently observed in Gd2Sn2O7. We present some evidence from Monte Carlo simulations and a perturbative renormalization group expansion.

【 授权许可】

Free