The symmetry breaking effects for quantum tunneling of the magnetization in Mn12-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.

The Origin of Second–Order Transverse Magnetic Anisotropy in Mn12–acetate / Cornia, Andrea; R., Sessoli; L., Sorace; D., Gatteschi; A. L., Barra; C., Daiguebonne. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 89:(2002), pp. 257201/1-257201/4.

The Origin of Second–Order Transverse Magnetic Anisotropy in Mn12–acetate

CORNIA, Andrea;
2002

Abstract

The symmetry breaking effects for quantum tunneling of the magnetization in Mn12-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.
89
257201/1
257201/4
The Origin of Second–Order Transverse Magnetic Anisotropy in Mn12–acetate / Cornia, Andrea; R., Sessoli; L., Sorace; D., Gatteschi; A. L., Barra; C., Daiguebonne. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 89:(2002), pp. 257201/1-257201/4.
Cornia, Andrea; R., Sessoli; L., Sorace; D., Gatteschi; A. L., Barra; C., Daiguebonne
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/450545
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 147
  • ???jsp.display-item.citation.isi??? 145
social impact