Electronic, magnetic, and vibrational properties of the molecular magnet Mn4 monomer and dimer

TL;DR

This paper investigates the electronic, magnetic, and vibrational properties of a newly synthesized Mn4 molecular magnet, revealing key magnetic interactions and providing theoretical data that align with experimental observations.

Contribution

It offers a comprehensive density-functional theory analysis of the Mn4 monomer and dimer, including magnetic interactions and vibrational spectra, advancing understanding of this novel single-molecule magnet.

Findings

Antiferromagnetic exchange interaction explains magnetic phenomena.

Calculated properties agree with experimental data.

Vibrational spectra predictions facilitate future experimental validation.

Abstract

A new type of the single-molecule magnet [Mn_4 O_3 Cl_4 (O_2 CEt)_3(py)_3] forms dimers. Recent magnetic hysteresis measurements on this single-molecular magnet revealed interesting phenomena: an absence of quantum tunneling at zero magnetic field and tunneling before magnetic field reversal. This is attributed to a significant antiferromagnetic exchange interaction between different monomers. To investigate this system, we calculate the electronic structure, magnetic properties, intramolecular and intermolecular exchange interactions using density-functional theory within the generalized-gradient approximation. Our calculations agree with experiment. We also calculate vibrational infrared absorption and Raman scattering intensities for the monomer which can be tested experimentally.