Abstract
In a study of the infrared optical absorption spectra of polycrystalline La1−x CaxMnO3 (0.1⩽x⩽0.8), a contribution from free charge carriers is observed below the Curie temperature for compositions with x⩽0.4. The existence of this contribution for samples with a high resistivity is a direct proof of the existence of “metallic” drops in an insulating matrix. The relative volume of the “metallic” phase is estimated.
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Pis’ma Zh. Éksp. Teor. Fiz. 68, No. 1, 89–92 (10 July 1998)