ORIGIN OF SECOND ORDER TRANSVERSE MAGNETIC ANISOTROPY IN MN12 ACETATE

Sessoli, Roberta; Sorace, Lorenzo; Gatteschi, Dante; Cornia, A.; Barra, A.; Daiguebonne, C.

doi:10.1103/PhysRevLett.89.257201

The symmetry breaking effects for quantum tunneling of the magnetization in Mn-12-acetate, a molecular nanomagnet, represent an open problem. We present structural evidence that the disorder of the acetic acid of crystallization induces sizable distortion of the Mn(III) sites, giving rise to six different isomers. Four isomers have symmetry lower than tetragonal and a nonzero second-order transverse magnetic anisotropy, which has been evaluated using a ligand field approach. The result of the calculation leads to an improved simulation of electron paramagnetic resonance spectra and justifies the tunnel splitting distribution derived from the field sweep rate dependence of the hysteresis loops.

trova@unifi

Titolo:	ORIGIN OF SECOND ORDER TRANSVERSE MAGNETIC ANISOTROPY IN MN12 ACETATE
Autori di Ateneo:	SESSOLI, ROBERTA SORACE, LORENZO GATTESCHI, DANTE A. CORNIA A. BARRA C. DAIGUEBONNE mostra contributor esterni nascondi contributor esterni
Autori:	SESSOLI, ROBERTA; SORACE, LORENZO; GATTESCHI, DANTE; A. CORNIA; A. BARRA; C. DAIGUEBONNE
Anno di registrazione:	2002
Rivista:	PHYSICAL REVIEW LETTERS
Volume:	89
Pagina iniziale:	257201
Pagina finale:	257201
Abstract:	The symmetry breaking effects for quantum tunneling of the magnetization in Mn-12-acetate, a molecular nanomagnet, represent an open problem. We present structural evidence that the disorder of the acetic acid of crystallization induces sizable distortion of the Mn(III) sites, giving rise to six different isomers. Four isomers have symmetry lower than tetragonal and a nonzero second-order transverse magnetic anisotropy, which has been evaluated using a ligand field approach. The result of the calculation leads to an improved simulation of electron paramagnetic resonance spectra and justifies the tunnel splitting distribution derived from the field sweep rate dependence of the hysteresis loops.
Handle:	http://hdl.handle.net/2158/4531
Appare nelle tipologie:	1a - Articolo su rivista

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