Some Mesoscopic Rings: Exact Simulations and Experiment

• Authors: G. Kamieniarz , R. Matysiak , A Caramico D'Auria , F. Esposito , C. Benelli
• Languages of publication: EN

Abstracts

EN

A numerical transfer-matrix approach and an exact diagonalization technique exploiting the point-group symmetry are worked out in the framework of quantum statistical mechanics and group theory for finite rings. They are applied to spin models of the high nuclearity cyclic clusters [Mn(hfac)_{2}NITPh]_{6} and Ni_{12}(O_{2}CMe)_{12}(chp)_{12}(H_{2}O)_{6}(THF)_{6}. The microscopic parameters of both molecules (J/k_{B}=350±10 K and J/k_{B}=8.5 K±0.5, g=2.23±0.01, respectively) are then obtained from a fit of the theoretical susceptibility curves to the experimental results which are supplemented for Ni_{12} by new low-temperature measurements.

Keywords

EN

75.40.Mg; 75.40.Cx; 75.10.Jm

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2000
• Volume: 98
• Issue: 6
• Pages: 721-727

Dates

published

2000-12

received

2000-07-03

(unknown)

2000-09-25

Contributors

author

G. Kamieniarz

• Computational Physics Division, Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

R. Matysiak

• Institute of Technology, Pedagogical University in Zielona Góra, Poland

author

A Caramico D'Auria

• Dipartimento di Scienze Fisiche, Università di Napoli "Federico II", Piazzale Tecchio, 80125 Napoli and INFM Unità di Napoli, Italy

author

F. Esposito

• Dipartimento di Scienze Fisiche, Università di Napoli "Federico II", Piazzale Tecchio, 80125 Napoli and INFM Unità di Napoli, Italy

author

C. Benelli

• Dipartimento di Chimica, Università di Firenze, via Maragliano 77, 50144 Firenze, Italy