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

被引：73

作者：

Zhao, YG ^{[1
]}

Li, JJ

Shreekala, R

Drew, HD

Chen, CL

Cao, WL

Lee, CH

Rajeswari, M

Ogale, SB

Ramesh, R

Baskaran, G

Venkatesan, T

机构：

[1] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[2] Univ Maryland, Ctr Superconduct Res, College Pk, MD 20742 USA

[3] Univ Maryland, Dept Elect Engn, College Pk, MD 20742 USA

[4] Univ Maryland, NSF, MRSEC Oxides Thin films & Surfaces, College Pk, MD 20742 USA

[5] Inst Math Sci, Taramani 600028, Chennai, India

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.81.1310

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

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页码：1310 / 1313

页数：4

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