Title :
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
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;
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
DOI :
10.1109/QELS.1999.807395
