Magnetic Gruneisen parameter and magnetocaloric properties of a coupled spin-electron double-tetrahedral chain

TL;DR

This paper provides an exact analysis of the magnetocaloric effect in a coupled spin-electron double-tetrahedral chain, revealing how ground-state degeneracy influences cooling efficiency during adiabatic demagnetization.

Contribution

It introduces an exact theoretical model for the magnetocaloric properties of a hybrid spin-electron system with a specific lattice structure.

Findings

Entropy and Gruneisen parameter are exactly calculated.

Ground-state degeneracy affects the cooling efficiency.

The study links magnetic properties to potential cooling applications.

Abstract

Magnetocaloric effect in a double-tetrahedral chain, in which nodal lattice sites occupied by the localized Ising spins regularly alternate with three equivalent lattice sites available for mobile electrons, is exactly investigated by considering the one-third electron filling and the ferromagnetic Ising exchange interaction between the mobile electrons and their nearest Ising neighbours. The entropy and the magnetic Gruneisen parameter, which closely relate to the magnetocaloric effect, are exactly calculated in order to investigate the relation between the ground-state degeneracy and the cooling efficiency of the hybrid spin-electron system during the adiabatic demagnetization.