Title :
Magnetic Correlations and Spin Dynamics in Crystalline La1−xCa xMnO3 (x = 0, 0.1, 0.2, 0.3): Analysis of Basic EPR Parameters
Author :
Auslender, M. ; Shames, A.I. ; Rozenberg, E. ; Gorodetsky, G. ; Mukovskii, Ya.M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Ben-Gurion Univ. of the Negev, Beer-Sheva
fDate :
6/1/2007 12:00:00 AM
Abstract :
Electron paramagnetic resonance data of La1-xCaxMnO3 compounds with x=0,0.1,0.2,0.3 were analyzed in order to explore the changes in effective spin-spin interactions and spin dynamics parameters. The presence of two magnetic subsystems - host of superexchange coupled Mn3+ ions and Mn4+ associated clusters is characteristic for x=0 and 0.1 samples, while ferromagnetically correlated host is observed in x=0.2 and 0.3 ones. The contributions of both ionic host and doped carriers to spin relaxation parameters were determined using general spin-dynamics theory.
Keywords :
calcium compounds; ferromagnetic materials; lanthanum compounds; paramagnetic resonance; spin dynamics; spin-spin interactions; spin-spin relaxation; superexchange interactions; EPR; La1-xCaxMnO3; associated clusters; doped carriers; electron paramagnetic resonance; ferromagnetic correlations; spin dynamics; spin relaxation; spin-spin interactions; superexchange coupled ions; Crystallization; Doping; Electrons; Insulation; Magnetic analysis; Magnetic resonance; Manganese; Paramagnetic resonance; Spectroscopy; Temperature; Magnetic resonance; magnetic susceptibility; manganese compounds;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2007.892174
