Theory of g-Shift and Linewidth in CeP Excited State EPR
The cerium monopnictides have NaCl structure. In the paramagnetic phase, the Ce3+ (J = 5/2) ion has a Γ7 crystal-field ground state doublet, and an excited Γ8 quartet. In EPR experiments,1 at 9.2 GHz we observed a single resonance peak for polycrystalline CeP (TN ≈ 10 K) from 77 to 300 K. The intensity indicates that the mode originates from within the excited Γ8 quartet. The width is about 300 G, increasing with temperature. Here we apply theory based on the memory function formalism of Mori and Zwanzig2–4 to analyze the behavior of these low lying quasielastic modes and compare the results with the experimental findings.
KeywordsTime Reversal Symmetry Resonant Field Heisenberg Exchange Excited State Quartet Random Phase Approximation3
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- 1.K. Sugawara, C.Y. Huang and B.R. Cooper, Bull. Am. Soc. 21, 271 (1975); See also B.R. Cooper, C.Y. Huang, and K. Sugawara, AIP Conf. Proc. No. 29, 428 (1976); and C.Y. Huang, K. Sugawara, and B.R. Cooper in Crystal Field Effects in Metals and Alloys, edited by A. Furrer, Plenum Press, New York and London (1977), p. 51.Google Scholar
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