Mixing of magnetic states in a <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Cr</mi></mrow><mrow><mn>8</mn></mrow></msub></mrow></math></span> molecular ring

M. Affronte; T. Guidi; R. Caciuffo; S. Carretta; G. Amoretti; J. Hinderer; I. Sheikin; A. G. M. Jansen; A. A. Smith; R. E. P. Winpenny; J. van Slageren; D. Gatteschi

doi:10.1103/PhysRevB.68.104403

Mixing of magnetic states in a ${Cr}_{8}$ molecular ring

M. Affronte, T. Guidi, R. Caciuffo, S. Carretta, G. Amoretti, J. Hinderer, I. Sheikin, A. G. M. Jansen, A. A. Smith, R. E. P. Winpenny, J. van Slageren, and D. Gatteschi

Phys. Rev. B 68, 104403 – Published 4 September 2003

Abstract

Effects of mixing of magnetic states in a molecular ${Cr}_{8}$ ring were investigated by torque magnetometry and heat capacity measurements. Results are interpreted within the framework of the spin Hamiltonian approach allowing us to fit the pattern of energy levels derived by neutron spectroscopy. The torque signal gives evidence of mixing of states with the same parity while the Schottky anomaly vanishes at $B_{c 1} = 6.9 T$ and $B_{c 2} = 14.0 T,$ the fields at which the $S = | 0, 0 〉$ state crosses $S = | 1, - 1 〉$ and $S = | 1, - 1 〉$ crosses $S = | 2, - 2 〉,$ respectively, showing no repulsion between states with different parity, in contrast to what was observed on ferric wheels.

Received 18 April 2003

DOI:https://doi.org/10.1103/PhysRevB.68.104403

Authors & Affiliations

M. Affronte¹, T. Guidi², R. Caciuffo², S. Carretta³, G. Amoretti³, J. Hinderer⁴, I. Sheikin⁴, A. G. M. Jansen⁴, A. A. Smith⁵, R. E. P. Winpenny⁵, J. van Slageren⁶, and D. Gatteschi⁶

¹INFM - S3 National Research Center on nanoStructures and bioSystems at Surfaces and Dipartimento di Fisica, Università di Modena e Reggio Emilia, via G. Campi 213/A, I-41100 Modena, Italy
²INFM and Dipartimento di Fisica ed Ingegneria dei Materiali, Università Politecnica delle Marche, via Brecce Bianche, I-60131 Ancona, Italy
³INFM and Dipartimento di Fisica, Università di Parma, v. Parco Area delle Scienze 7/A, I-43100 Parma, Italy
⁴GHMFL MPI-FKF and CNRS, BP 166, 25, Avenue des Martyrs, F-38042 Grenoble, France
⁵Department of Chemistry, University of Manchester, Oxford Road, Manchester M139PL, United Kingdom
⁶INSTM and Dipartimento di Chimica, Università di Firenze, Via della Lastruccia 3, I-50019 Sesto Fiorentino, Italy

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Vol. 68, Iss. 10 — 1 September 2003

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