Thermodynamic Properties of Spin Ladders with Cyclic Exchange

TL;DR

This paper investigates how cyclic (4-spin) exchange affects the thermodynamic properties of two-leg S=1/2 spin ladders using high temperature series expansion and exact diagonalization, providing insights for experimental data analysis.

Contribution

It introduces a detailed analysis of cyclic exchange effects on spin ladder thermodynamics using two complementary computational methods.

Findings

Cyclic exchange significantly influences susceptibility and specific heat.

Results are consistent across high temperature series and exact diagonalization methods.

Provides a reliable basis for analyzing experimental data on spin ladders.

Abstract

By high temperature series expansion and exact complete diagonalization the magnetic susceptibility chi(T) and the specific heat C(T) of a two-leg S=1/2 ladder with cyclic (4-spin) exchange are computed. Both methods yield convincing results for not too small temperatures. We find that a small amount of cyclic exchange influences the thermodynamical properties significantly. Our results can serve as reliable basis for an efficient analysis of experimental data