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Spectroscopic Studies of Inhomogeneous Electronic Phases in Colossal Magnetoresistance and Charge-Ordering Compounds

Published online by Cambridge University Press:  10 February 2011

S. L. Cooper ,
H. L. Liu ,
S. Yoon ,
S-W. Cheong  and
Z. Fisk
S. L. Cooper
Affiliation:
Dept. of Physics and Frederick Seitz Materials Research Laboratory U. of Illinois at Urbana-Champaign, Urbana, Illinois 61801USA
H. L. Liu
Affiliation:
Dept. of Physics and Frederick Seitz Materials Research Laboratory U. of Illinois at Urbana-Champaign, Urbana, Illinois 61801USA
S. Yoon
Affiliation:
Dept. of Physics and Frederick Seitz Materials Research Laboratory U. of Illinois at Urbana-Champaign, Urbana, Illinois 61801USA
S-W. Cheong
Affiliation:
Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 and Dept. of Physics and Astronomy, Rutgers University, Piscataway, New JerseyUSA
Z. Fisk
Affiliation:
Dept. of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306USA
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Abstract

Infrared reflectance and Raman spectroscopy measurements have been performed through the metal-semiconductor (or -semimetal) transitions of various “colossal magnetoresistance” and charge-ordering materials, including EuB6 and the manganese perovskites. As described in this paper, our results demonstrate that these systems have phase regions characterized by electronic inhomogeneity of various types, including: (1) pure spin polarons, which form in a narrow temperature range above Tc in the “colossal magnetoresistance” system EuB6; (2) magnetoelastic polarons, and an inhomogeneous ferromagnetic phase comprised of both metallic and insulating regions, in the “colossal magnetoresistance” regime of La1−x(Sr,Ca)xMnO3 (x < 0.5); and (3) phase separation behavior involving coexisting ferromagnetic and antiferromagnetic domains in the intermediatetemperature (CO) phase of the charge-ordering system Bi1−xCaxMnO3 (x > 0.5).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 167
Copyright
Copyright © Materials Research Society 2000

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