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Temperature dependence of Pb 3+ EPR spectrum in irradiated calcite
Author(s) -
Popescu F. F.,
Grecu V. V.
Publication year - 1975
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220680217
Subject(s) - hyperfine structure , electron paramagnetic resonance , hamiltonian (control theory) , atmospheric temperature range , condensed matter physics , atomic physics , phonon , lattice (music) , amplitude , chemistry , nuclear magnetic resonance , physics , optics , mathematical optimization , mathematics , meteorology , acoustics
The spin‐Hamiltonian parameters and the line widths of Pb 3+ in CaCO 3 have been measured over the temperature range 77 to 300 °K. The hyperfine interaction is very large so that the intermediate field approximation was used. The hyperfine interaction decreases as the temperature increases, in agreement with the effect of lattice‐vibrations on the ground state. The hypothesis of a large‐amplitude resonance mode is used for explaining the qualitative temperature dependence. Extra line widths is described to the presence of hyperfine interaction of the 207 Pb isotope. A dynamic process is assumed which is related to the change of spin−lattice relaxation via phonon modulation of the hyperfine interaction.