Absence of small lattice polarons above the Curie temperature in magnetoresist (y=0 and 0.04)

Article

关键词: FERROMAGNETIC TRANSITION;    EMISSION MOSSBAUER;    DISTORTIONS;    LA0.8CA0.2MNO3;    MAGNETIZATION;    BREAKDOWN;    ORIGIN;   

DOI  :  10.1103/PhysRevB.63.052411

来源: SCIE

【 摘 要 】

It is generally believed that the electrical transport in magnetoresistive manganites above T-C is governed by small polarons associated with large lattice distortions. We present evidence which confirms the existence of magnetic clusters (polarons) associated with minimal lattice distortions above the Curie temperature. We take advantage of the fact that the Mossbauer spectra of the relatively large and slowly fluctuating magnetic polarons consist of incompletely collapsed magnetic component with extensive wings.

【 授权许可】

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