Mechanisms Of The Electron Paramagnetic Resonance Line Broadening In La1-Xcaxmno3

A complex theoretical approach, summarizing ions-ions, ions-carries, and carriers-lattice couplings, is proposed for modeling and analyzing the electron paramagnetic resonance line broadening in doped manganites. Fitting the above model to the experimental data supports the applicability of our approach. The results obtained on single crystals and ceramics of prototypical La1-xCaxMnO3 system in a wide interval of Ca-dopant concentration (0 <= x <= 0.7) evidence that depending on x (i.e., on magnetic ground state and carriers' content and mobility) the discussed effect is governed by different mechanisms-mainly ions-ions and/or carriers-lattice spin relaxation. (C) 2013 American Institute of Physics.