Ultrafast laser induced conductive and resistive transients in La0.7Ca0.3MnO3: Charge transfer and relaxation dynamics
Publication Type
Journal Article
Authors
Zhao, Y.G, J.J Li, R Shreekala, H.D Drew, C.L Chen, W.L Cao, C.H Lee, M Rajeswari, S.B Ogale, Ramamoorthy Ramesh, G Baskaran, T Venkatesan
DOI
Abstract
Pulsed laser excitation induced conductance changes in colossal magnetoresistance material La0.7Ca0.3MnO3 were studied on the picosecond time scale. A two-component signal was seen consisting of a fast positive transient associated with the paramagnetic insulating state and a slower negative signal associated with the ferromagnetic metallic state. The fast component corresponds to the photoionization of the Jahn-Teller small polaron. The slow component is explained in terms of the reduced carrier mobility due to photogenerated magnetic excitations. © 1998 The American Physical Society.
Journal
Physical Review Letters
Volume
81
Year of Publication
1998
ISSN
00319007
Notes
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