Similarity of thermodynamic properties of the Heisenberg model on triangular and kagome lattices
Abstract
Derivation of a reduced effective model allows for a unified treatment and discussion of the J1-J2S =1 /2 Heisenberg model on triangular and kagome lattices. Calculating thermodynamic quantities, i.e., the entropy s (T ) and uniform susceptibility χ0(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 χ0(T ) in both models down to T ≪J1 . 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.
- Publication:
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Physical Review B
- Pub Date:
- February 2020
- DOI:
- 10.1103/PhysRevB.101.075105
- arXiv:
- arXiv:1906.11576
- Bibcode:
- 2020PhRvB.101g5105P
- Keywords:
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- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 6 pages, 5 figures + supplementary