Magnetocaloric effect in the symmetric spin-1/2 diamond chain with different Land\'e g-factors of Ising and Heisenberg spins

TL;DR

This paper provides an exact solution for a symmetric spin-1/2 diamond chain with different Landé g-factors, revealing enhanced magnetocaloric effects near phase transitions and zero-field limits, influenced by ground state degeneracy.

Contribution

It introduces an exact analytical approach combining decoration-iteration and transfer-matrix methods to study magnetocaloric effects in a mixed-spin diamond chain with varying g-factors.

Findings

Enhanced magnetocaloric effect near phase transitions

Dependence of cooling efficiency on ground state degeneracy

Exact solution of the model using combined analytical methods

Abstract

The symmetric spin-1/2 Ising-Heisenberg diamond chain with different Land\'e g-factors of Ising and Heisenberg spins is exactly solved by combining the generalized decoration-iteration transformation and transfer-matrix method. The ground state of the system and magnetocaloric effect during the adiabatic (de)magnetization are particularly examined. It is evidenced that the considered mixed-spin diamond chain exhibits an enhanced magnetocaloric effect during the adiabatic (de)magnetization in the vicinity of field-induced phase transitions as well as in the zero-field limit if the frustrated phase constitutes the zero-field ground state, but the cooling efficiency depends on whether the system is macroscopically degenerate in these parameter regions or not.