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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2002     Display Documents



  history
ID: 7477.0, MPI für Festkörperforschung / FKF Publikationen 2002
Origin of second-order transverse magnetic anisotropy in Mn12-acetate
Authors:Cornia, A.; Sessoli, R.; Sorace, L.; Gatteschi, D.; Barra, A. L.; Daiguebonne, C.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Physical Review Letters
Volume:89
Issue / Number:25
Sequence Number of Article:257201
Review Status:Peer-review
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Univ Florence, Dipartimento Chim, Via Lastruccia 3, I-50019 Sesto Fiorentino, Italy
; Univ Florence, INSTM, I-50019 Sesto Fiorentino, Italy
; Univ Modena & Reggio Emilia, INSTM, I-41100 Modena, Italy
; Univ Modena & Reggio Emilia, Dipartimento Chim, I-41100 Modena, Italy
; CNRS, F-38042 Grenoble 9, France
; MPI FKF, Grenoble High Magnet Field Lab, F-38042 Grenoble 9, France
; INSA, Grp Rech Chim & Met, F-35043 Rennes, France
Identifiers:ISI:000179678900045
ISSN:0031-9007
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