Finite-temperature properties of the easy-axis Heisenberg model on frustrated lattices

TL;DR

This study investigates the finite-temperature magnetic properties of the easy-axis Heisenberg model on frustrated lattices, revealing long-range correlations on the triangular lattice and spin-liquid behavior on the kagome lattice through numerical simulations.

Contribution

It provides the first detailed finite-temperature analysis of the easy-axis Heisenberg model on these frustrated lattices, highlighting distinct behaviors on triangular and kagome geometries.

Findings

Triangular lattice shows long-range correlations at all anisotropies.

Thermodynamic quantities indicate a crossover with increasing anisotropy.

Kagome lattice exhibits short-range correlations consistent with a spin liquid.

Abstract

Motivated by recent experiments on a compound {displaying Ising-like short-range correlations on the triangular lattice, we study the anisotropic easy-axis spin-$1/2$ Heisenberg model on the triangular and kagome lattice} by performing numerical calculations of finite-temperature properties, in particular of static spin structure factor and of thermodynamic quantities, on systems with up to 36 sites. On the triangular lattice, the low-temperature spin structure factor {exhibits long-range} spin correlations in the whole range of anisotropies, whereas thermodynamic quantities reveal a crossover upon increasing the anisotropy, most pronounced in the vanishing generalized Wilson ratio in the easy-axis regime. In contrast, on the kagome lattice, the spin structure factor is short-range, and thermodynamic quantities evolve steadily between the easy-axis and the isotropic case, consistent with the interpretation in terms of {a} spin liquid.