A FERROMAGNETIC-RESONANCE STUDY OF LA1-XCAXMNO3

Ferromagnetic resonance spectra of La1-xCaxMnO3 powders (0.1 less than or equal to x 0.9) have been investigated over a range of temperature s. The spectra could be fitted to a sum of two Lorentzians for all the compositions. The intense line with a nearly constant g shows a linea r decrease in linewidth with increase in temperature, while the weaker line with a variable g shows a maximum in linewidth in the T-c region . The latter is also associated with a g(eff) which depends on the com position. Copyright (C) 1996 Elsevier Science Ltd