Ground state and thermodynamic properties of spin-1/2 isosceles Heisenberg triangles for V$_6$-like magnetic molecules

TL;DR

This paper investigates the ground state and thermodynamic properties of V6-like magnetic molecules modeled as coupled spin-1/2 isosceles Heisenberg triangles, revealing phase transitions and magnetocaloric effects through exact diagonalization.

Contribution

It provides a detailed analysis of the quantum phase diagram and thermodynamic behavior of a specific spin model relevant to V6 magnetic molecules, using exact diagonalization methods.

Findings

Identified quantum phase transitions as a function of model parameters.

Calculated thermodynamic quantities like magnetization, entropy, and specific heat.

Analyzed the magnetocaloric effect for different Hamiltonian parameters.

Abstract

The spin-1/2 Hamiltonian for two coupled isosceles Heisenberg triangles, which is well suited for describing the V$_6$-type magnetic molecules, is studied by exact diagonalization. The quantum phase transition diagram, at zero temperature, is obtained as a function of the theoretical parameters. The zero temperature magnetization is also obtained as a function of the external magnetic field. The thermodynamic behavior of the magnetization, entropy, susceptibility, and specific heat, as a function of temperature, are also computed and the corresponding magnetocaloric effect analyzed for various values of the Hamiltonian parameters.