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Tunneling and EPR linewidths due to dislocations in Mn acetate |
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| Authors: | D.A. Garanin E.M. Chudnovsky |
| Affiliation: | INFM - COHERENTIA - Dip. Scienze Fisiche, Università di Napoli Federico II, Napoli, Italy, IT Istituto di Cibernetica del CNR Arco Felice (NA), Italy, IT DIMSAT, Università di Cassino, Cassino (Fr), Italy, IT |
| 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. Received 2 August 2001 / Received in final form 15 March 2002 Published online 17 September 2002 |
| Keywords: | PACS. 75.45.+j Macroscopic quantum phenomena in magnetic systems – 75.50.Tt Fine-particle systems nanocrystalline materials |
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