Magneto-thermodynamics of the spin-1/2 Kagome antiferromagnet

TL;DR

This study investigates the thermodynamic properties of the spin-1/2 Kagome antiferromagnet under high magnetic fields, revealing a T^2 low-temperature behavior and the role of low-lying singlet states in its magneto-thermal response.

Contribution

A new hybrid computational method is introduced to analyze the thermodynamics of the Kagome antiferromagnet under strong magnetic fields, highlighting the significance of low-lying singlet excitations.

Findings

T^2 low-temperature specific heat behavior

Low sensitivity of specific heat to magnetic field

Evidence of low-lying fluctuating singlets

Abstract

In this paper, we use a new hybrid method to compute the thermodynamic behavior of the spin-1/2 Kagome antiferromagnet under the influence of a large external magnetic field. We find a T^2 low-temperature behavior and a very low sensitivity of the specific heat to a strong external magnetic field. We display clear evidence that this low temperature magneto-thermal effect is associated to the existence of low-lying fluctuating singlets, but also that the whole picture (T^2 behavior of Cv and thermally activated spin susceptibility) implies contribution of both non magnetic and magnetic excitations. Comparison with experiments is made.