Similarity of thermodynamic properties of the Heisenberg model on triangular and kagome lattices

Article

关键词: FINITE-TEMPERATURE PROPERTIES;    QUANTUM SPIN LIQUID;    ANTIFERROMAGNET;    STATE;    ORDER;   

DOI  :  10.1103/PhysRevB.101.075105

来源: SCIE

【 摘 要 】

Derivation of a reduced effective model allows for a unified treatment and discussion of the J(1)-J(2) S = 1/2 Heisenberg model on triangular and kagome lattices. Calculating thermodynamic quantities, i.e., the entropy s(T) and uniform susceptibility chi(0)(T), numerically on systems up to effectively N = 42 sites, we show by comparing to full-model results that low-T properties are qualitatively well represented within the effective model. Moreover, we find in the spin-liquid regime similar variation of s(T) and chi(0)(T) in both models down to T << J(1). In particular, studied spin liquids appear to be characterized by the Wilson ratio vanishing at low T, indicating that the low-lying singlets are dominating over the triplet excitations.

【 授权许可】

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