Intramolecular and Lattice Dynamics in V_{6-n}^{IV}V_ n^V O_7(OCH_3)_{12} Crystal

• Authors: Yu. Yablokov , M. Augustyniak-Jabłokow , S. Borshch , C. Daniel , H. Hartl
• Languages of publication: EN

Abstracts

EN

Multi-nuclear mixed-valence clusters V_4^{IV}V_2^VO_7(OCH_3)_{12} were studied by X-band EPR in the temperature range 4.2-300 K. An isotropic exchange interactions between four V^{IV} ions with individual spin S_i=1/2 determine the energy levels structure of the compound with the total spin states S=0, 1, and 2, which are doubled and split due to the extra electron transfer. The spin-Hamiltonian approach was used for the analysis of the temperature dependences of the EPR spectra parameters and the cluster dynamics. Two types of the electron transfer are assumed: the single jump transfer leading to the splitting of the total spin states by intervals comparable in magnitude with the exchange parameter J≈100-150 cm^{-1} and the double jump one resulting in dynamics. The dependence of the transition ratesν_{tr} on the energy of the total spin states was observed. In particular, in the range 300-220 K theν_{tr} ≈0.7×10^{10} cm^{-1} and below 180 K the ν_{tr}≈1×10^{10} cm^{-1} was estimated. The g-factors of the spin states were shown to depend on the values of the intermediate spins. A phase transition in the T-range 210-180 K leading to the change in the initial V^{IV} ions localization was discovered.

Keywords

EN

76.30.Fc; 36.40.Cg

Discipline

• 36.40.Cg: Electronic and magnetic properties of clusters
• 76.30.Fc: Iron group (3d) ions and impurities (Ti-Cu)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 2
• Pages: 271-281

Dates

published

2005-08

received

2005-04-24

Contributors

author

Yu. Yablokov

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

M. Augustyniak-Jabłokow

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

S. Borshch

• Laboratoire de Chimie, UMR 5181 CNRS-ENS de Lyon, 69364 Lyon Cedex 07, France

author

C. Daniel

• Institut für Chemie, Freie Universität Berlin, Fabeckstr. 34-36, 14195 Berlin, Germany

author

H. Hartl

• Institut für Chemie, Freie Universität Berlin, Fabeckstr. 34-36, 14195 Berlin, Germany

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Identifiers

DOI

10.12693/APhysPolA.108.271