Optical evidence of mixed-phase behavior in manganite films

Document Type

Article

Publication Date

12-1-2008

Abstract

Synchrotron infrared measurements were conducted on a self-doped Lax MnO3-δ (x∼0.8) film. From these measurements we determined the conductivity and the temperature dependence of the effective number of carriers. While the metal-insulator transition temperature (TMI) and the magnetic ordering temperature (TC) approximately coincide, the onset of the change in the free carrier density occurs at a significantly lower temperature (∼45 K below). This suggests that local distortions exist below TMI and TC which trap the eg conduction electrons. These regions with local distortions constitute an insulating phase which persists for temperatures significantly below TMI and TC. © 2008 The American Physical Society.

Identifier

58149168719 (Scopus)

Publication Title

Physical Review B Condensed Matter and Materials Physics

External Full Text Location

https://doi.org/10.1103/PhysRevB.78.220404

e-ISSN

1550235X

ISSN

10980121

Issue

22

Volume

78

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