%0 Journal Article
%A Y.G Zhao
%A J.J Li
%A R Shreekala
%A H.D Drew
%A C.L Chen
%A W.L Cao
%A C.H Lee
%A M Rajeswari
%A S.B Ogale
%A Ramamoorthy Ramesh
%A G Baskaran
%A T Venkatesan
%B Physical Review Letters
%D 1998
%G eng
%P 1310-1313
%R 10.1103/PhysRevLett.81.1310
%T Ultrafast laser induced conductive and resistive transients in La0.7Ca0.3MnO3: Charge transfer and relaxation dynamics
%V 81
%X 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.