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

ID: 7571.0, MPI für Festkörperforschung / FKF Publikationen 2002
Observation of Magnetic Level Repulsion in Fe6:Li Molecular Antiferromagnetic Rings
Authors:Affronte, M.; Cornia, A.; Lascialfari, A.; Borsa, F.; Gatteschi, D.; Hinderer, J.; Horvatić, M.; Jansen, A. G. M.; Julien, M.-H.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Physical Review Letters
Issue / Number:16
Sequence Number of Article:167201
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Heat capacity (C), magnetic torque, and proton NMR relaxation
rate (1/T-1) measurements were performed on Fe6:Li single
crystals in order to study the crossings between S = 0 and S =
1 and between S = 1 and S = 2 magnetic states of the molecular
rings, at magnetic fields B-c1 = 11.7 T and B-c2 = 22.4 T,
respectively. C vs B data at 0.78 K show that the energy gap
between two states remains finite at B-c 's (Delta(1)/k(B) =
0.86 K and Delta(2)/k(B) = 2.36 K) thus proving that levels
repel each other. The large Delta(1) value may also explain the
anomalously large width of the peak in 1/T-1 vs B, around B-c1.
This anticrossing, unexpected in a centrosymmetric system,
requires a revision of the Hamiltonian.
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Univ Modena & Reggio Emilia, INFM, Via G Campi 213-A, I-41100 Modena, Italy
; Univ Modena & Reggio Emilia, Dipartimento Fis, I-41100 Modena, Italy
; Univ Modena & Reggio Emilia, INSTM, I-41100 Modena, Italy
; Univ Modena & Reggio Emilia, Dipartimento Chim, I-41100 Modena, Italy
; Univ Pavia, INFM, I-27100 Pavia, Italy
; Univ Pavia, Dipartimento Fis A Volta, I-27100 Pavia, Italy
; Iowa State Univ, Ames Lab, Dept Phys & Astron, Ames, IA 50011 USA
; Univ Florence, INSTM, I-50019 Florence, Italy
; Univ Florence, Dipartimento Chim, I-50019 Florence, Italy
; CNRS, F-38042 Grenoble, France
; MPI FKF, Grenoble High Magnet Field Lab, F-38042 Grenoble, France
; Univ Grenoble 1, Spectrometrie Phys Lab, F-38402 St Martin Dheres, France
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