Abstract
High-pressure technique as applied to studies of different problems in solid state physics by EPR spectroscopy is presented. An influence of hydrostatic pressure up to 500 MPa on a weak superexchange coupling between Cu(II) ions in monomeric and dimeric copper(II) compounds is described. Both decrease and increase in the coupling is observed under pressure depending on the crystal and molecular structure but in all cases a dominant contribution is due to a shortening of intermolecular distances, whereas molecular structure and molecular vibrations are not affected. In dimeric Cu(II) compounds with resolved fine structure of EPR spectra zero-field splitting is weakly or not at all dependent on pressure whereas a strong dependence on temperature exists. It is discussed as a result of vibronic ligand behaviour which is not volume dependent. For all cases complementary temperature dependences are presented and moreover a behaviour of EPR linewidth under pressure and temperature is shown. An influence of high pressure on spin exchange reactions in solutions and on the phase memory time in electron spin echo experiments is briefly described.
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Hoffmann, S.K., Krupski, M. & Hilczer, W. High-pressure EPR studies of intermolecular interactions in solids. Appl. Magn. Reson. 5, 407–424 (1993). https://doi.org/10.1007/BF03162537
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DOI: https://doi.org/10.1007/BF03162537