Eur. Phys. J. B 29, 3-7 (2002)
https://doi.org/10.1140/epjb/e2002-00254-2

Tunneling and EPR linewidths due to dislocations in Mn₁₂ acetate

¹ Department of Physics and Astronomy, Lehman College, City University of New York, 250 Bedford Park Boulevard West, Bronx, New York 10468-1589, USA
² Institut für Physik, Johannes Gutenberg - Universität, 55099 Mainz, Germany

Corresponding author: ^a garanin@uni-mainz.de

Received: 2 August 2001
Revised: 15 March 2002
Published online: 17 September 2002

Abstract

We compute the width and shape of the EPR and tunneling resonances due to dislocations in Mn₁₂ acetate crystals. Uncorrelated dislocations produce the Gaussian shape of resonances while dislocations bound in pairs produce the Lorentzian shape. We stress that the uniaxial spin Hamiltonian together with crystal defects can explain the totality of experimental data on Mn₁₂.