ULTRAFAST LASER-INDUCED CONDUCTIVE AND RESISTIVE TRANSIENTS IN LA0.7CA0.3MNO3 - CHARGE-TRANSFER AND RELAXATION DYNAMICS

Authors
ZHAO YG LI JJ SHREEKALA R DREW HD CHEN CL CAO WL LEE CH RAJESWARI M OGALE SB RAMESH R BASKARAN G VENKATESAN T
Citation
Yg. Zhao et al., ULTRAFAST LASER-INDUCED CONDUCTIVE AND RESISTIVE TRANSIENTS IN LA0.7CA0.3MNO3 - CHARGE-TRANSFER AND RELAXATION DYNAMICS, Physical review letters, 81(6), 1998, pp. 1310-1313
Citations number
17
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
81
Issue
6
Year of publication
1998
Pages
1310 - 1313
Database
ISI
SICI code
0031-9007(1998)81:6<1310:ULCART>2.0.ZU;2-M
Abstract
Pulsed laser excitation induced conductance changes in colossal magnet oresistance material La0.7Ca0.3MnO3 were studied on the picosecond tim e scale. A two-component signal was seen consisting of a fast positive transient associated with the paramagnetic insulating state and a slo wer negative signal associated with the ferromagnetic metallic state. The fast component corresponds to the photoionization of the Jahn-Tell er small polaron. The slow component is explained in terms of the redu ced carrier mobility due to photogenerated magnetic excitations.