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Ultrafast Laser Induced Conductive and Resistive Transients inLa0.7Ca0.3MnO3: Charge Transfer and Relaxation Dynamics
- Source :
- Physical Review Letters. 81:1310-1313
- Publication Year :
- 1998
- Publisher :
- American Physical Society (APS), 1998.
-
Abstract
- Pulsed laser excitation induced conductance changes in colossal magnetoresistance material ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ 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.
Details
- ISSN :
- 10797114 and 00319007
- Volume :
- 81
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters
- Accession number :
- edsair.doi...........9f8211450899c9169fbf48e4369298bd