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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

10.1103/PhysRevLett.81.1310

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

Year of Publication

1998

ISSN

00319007

Notes

cited By 64

Research Areas

Ramesh Lab