Magnetic properties of the spin-1/2 Ising-Heisenberg diamond chain with the four-spin interaction

TL;DR

This paper provides an exact solution for a spin-1/2 Ising-Heisenberg diamond chain with four-spin interactions, revealing complex ground states, magnetization behavior, and thermodynamic properties influenced by various interactions and external magnetic fields.

Contribution

It introduces an exact analytical approach to analyze the effects of four-spin interactions in the Ising-Heisenberg diamond chain, highlighting new quantum ground states and thermodynamic phenomena.

Findings

Multiple quantum ground states with entanglement identified

Triple-peak specific heat curve observed near the triple point

Magnetic susceptibility shows characteristic temperature dependence

Abstract

A symmetric spin-1/2 Ising-Heisenberg diamond chain with the Ising four-spin interaction is exactly solved by means of the generalized decoration-iteration mapping transformation. The ground state, the magnetization process and thermodynamics are particularly examined for the case of antiferromagnetic pair interactions (Ising and isotropic Heisenberg ones). It is shown that an interplay between pair interactions, the four-spin interaction and the external magnetic field gives rise to several quantum ground states with entangled spin states in addition to some semi-classically ordered ones. Besides, the temperature dependence of the magnetic susceptibility multiplied by the temperature is studied and the interesting triple-peak specific heat curve is also detected when considering the zero-field region rather close to the triple point, where three different ground states coexist.