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The IR optical absorption (0.1-1.5 eV) in the $La_{0.7}Ca_{0.3}MnO_3$ filmson LAO substrate exhibits the drastic temperature evolution of the spectralweight evidencing the insulator to metal transition. Single crystal films werefound to reveal strong linear dichroism with anomalous spectral oscillationsand fairly weak temperature dependence. Starting from the concept of phaseseparation, we develop the effective medium model to account for these effects.The optical anisotropy of the films is attributed to the texturization of theellipsoidal inclusions of the quasimetal phase caused by a mismatch of the filmand substrate and the twin texture of the latter.Comment: 6 pages, 5 Encapsulated PostScript figures, uses RevTeX

Nanoscale phase separation in La0.7Ca0.3MnO3films: evidence for texture-driven optical anisotropy

Nanoscale phase separation in La_0.7Ca_0.3MnO₃films: evidence for texture-driven optical anisotropy