Application of the finite-temperature Lanczos method for the evaluation of magnetocaloric properties of large magnetic molecules

TL;DR

This paper explores the use of the finite-temperature Lanczos method to evaluate the magnetocaloric properties of large gadolinium-based magnetic molecules, aiming to improve sub-Kelvin cooling techniques.

Contribution

It introduces the application of the finite-temperature Lanczos method to large spin systems for accurate thermodynamic property evaluation.

Findings

Degeneracy of singlet ground state supports low-temperature adiabatic processes.

Finite-temperature Lanczos method effectively handles large Hilbert spaces.

Potential for improved sub-Kelvin cooling using magnetic molecules.

Abstract

We discuss the magnetocaloric properties of gadolinium containing magnetic molecules which potentially could be used for sub-Kelvin cooling. We show that a degeneracy of a singlet ground state could be advantageous in order to support adiabatic processes to low temperatures and simultaneously minimize disturbing dipolar interactions. Since the Hilbert spaces of such spin systems assume very large dimensions we evaluate the necessary thermodynamic observables by means of the Finite-Temperature Lanczos Method.