Otro
Exchange narrowing effects in the EPR linewidth of Gd diluted in Ce compounds
Registro en:
Journal of Applied Physics. Woodbury: Amer Inst Physics, v. 83, n. 11, p. 6958-6960, 1998.
0021-8979
10.1063/1.367745
WOS:000077795500244
WOS000077795500244.pdf
Autor
Venegas, Pablo Antonio
Netto, PRS
Resumen
Anomalous thermal behavior on the EPR linewidths of Gd impurities diluted in Cc compounds has been observed. In metals, the local magnetic moment EPR linewidth, Delta H, is expected to increase linearly with the temperature. In contrast, in CexLa1-xOs2 the Gd EPR spectra show a nonlinear increase. In this work, the mechanisms that are responsible for the thermal behavior of the EPR lines in CexLa1-xOs2 are examined. We show that the exchange interaction between the local magnetic moments and the conduction electrons are responsible for the narrowing of the spectra at low temperatures. At high temperatures, the contribution to the linewidth of the exchange interaction between the local magnetic moments and the Ce ions has an exponential dependence on the excitation energy of the intermediate valent ions. A complete fitting of the EPR spectra for powdered samples is obtained, (C) 1998 American Institute of Physics. [S0021-8979(98)39911-9].