Isothermal Entropy Change and Adiabatic Change of Temperature of the Antiferromagnetic Spin-1/2 Ising Octahedron and Dodecahedron

TL;DR

This paper investigates the magnetocaloric properties of antiferromagnetic spin-1/2 Ising octahedron and dodecahedron, revealing significant entropy changes and temperature variations useful for cooling applications.

Contribution

It provides the first detailed analysis of temperature-dependent magnetocaloric response functions for these polyhedral spin systems.

Findings

Large negative isothermal entropy change upon increasing magnetic field

Giant magnetocaloric effect observed during adiabatic demagnetization

Potential for cooling applications due to magnetocaloric properties

Abstract

The spin-1/2 Ising octahedron and dodecahedron with a unique antiferromagnetic interaction display an outstanding magnetization jump at zero magnetic field, which consequently leads to a giant magnetocaloric effect during the adiabatic demagnetization. In the present work we report temperature dependences of two basic magnetocaloric response functions: the isothermal entropy change and the adiabatic change of temperature. It is shown that the Ising octahedron and dodecahedron generally exhibit a large negative isothermal entropy change upon increasing of the magnetic field, which serves in evidence of their cooling performance.