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



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ID: 7463.0, MPI für Festkörperforschung / FKF Publikationen 2002
Effects of antisymmetric interactions in molecular iron rings
Authors:Cinti, F.; Affronte, M.; Jansen, A. G. M.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:The European Physical Journal B
Volume:30
Issue / Number:4
Start Page:461
End Page:468
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:The level crossing mechanism between the ground and the first
excited state of Na:Fe-6 antiferromagnetically coupled iron
rings is studied by torque magnetometry down to 40 mK and in
magnetic fields up to 28 T. The step width at the crossing
field B. assumes a finite value at the lowest temperatures.
This fact is ascribed to the presence of level anticrossing,
not expected for a ring with axial, i.e. S-6 point group,
symmetry. Assuming a reduced symmetry, we revised the model
Hamiltonian of such a spin system by introducing a
Dzyaloshinsky-Moriya (DM) term and we show, by exact
diagonalization, that DM term can account for the mixing of
states with different parity. In particular, analytical as well
numerical analysis show that the introduction of the DM term
may contribute to the broadening of the torque step as well as
for the finite energy gap at B, observed by heat capacity in a
similar ring Li:Fe-6 as previously reported [9].
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Univ Modena, Natl Res Ctr, INFM S3, Via G Campi 213-A, I-41100 Modena, Italy
; Univ Modena, Dipartimento Fis, I-41100 Modena, Italy
; CNRS, MPI, Grenoble High Magnet Field Lab, F-38042 Grenoble, France
Identifiers:ISI:000180858600005
ISSN:1434-6028
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