Ultrafast laser induced conductive and resistive transients in La0.7Ca0.3MnO3: Charge transfer and relaxation dynamics

Publication Type:

Journal Article

Authors:

Y.G. Zhao; 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

Source:

Physical Review Letters, Volume 81, Number 6, p.1310-1313 (1998)

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.

Notes:

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