Charge transfer and the relaxation dynamics of the metal-insulator transition in La/sub 0.7/A/sub 0.3/MnO/sub 3/ (A=Ca, Sr)

Author

Lobad, A. ; Taylor, A.J. ; Trugman, S.A. ; Chuhee Kwon

Author_Institution

Div. of Mater. Sci. & Technol., Los Alamos Nat. Lab., NM, USA

fYear

1992

fDate

23-28 May 1992

Firstpage

121

Abstract

Summary form only given. The discovery of Colossal magneto resistance in doped manganese-oxide perovskites has lead to a resurgence of interest in this class of materials. Besides their technological value, they represent a model system to investigate the relation between electron correlation, local structure, long range order and physical properties. Recent measurements of the temperature dependence of the optical conductivity spectrum in La/sub 0.7/Ca/sub 0.3/MnO/sub 3/ and La/sub 0.7/Sr/sub 0.3/MnO/sub 3/ and were found to agree quite well with model calculations in which double exchange-driven hopping is coupled to dynamic Jahn-Teller polaron.

Keywords

charge exchange; lanthanum compounds; magneto-optical effects; metal-insulator transition; polarons; Colossal magneto resistance; La/sub 0.7/A/sub 0.3/MnO/sub 3/; La/sub 0.7/Ca/sub 0.3/MnO/sub 3/; La/sub 0.7/Sr/sub 0.3/MnO/sub 3/; charge transfer; doped manganese-oxide perovskites; double exchange-driven hopping; dynamic Jahn-Teller polaron; electron correlation; local structure; long range order; metal-insulator transition; optical conductivity spectrum; physical properties; relaxation dynamics; technological value; temperature dependence; Charge transfer; Conducting materials; Conductivity measurement; Electrical resistance measurement; Electrons; Magnetic materials; Metal-insulator structures; Optical materials; Temperature dependence; Temperature measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Quantum Electronics and Laser Science Conference, 1999. QELS '99. Technical Digest. Summaries of Papers Presented at the

Conference_Location

Baltimore, MD, USA

Print_ISBN

1-55752-576-X

Type

conf

DOI

10.1109/QELS.1999.807395

Filename

807395