Ultrafast Structural Phase Transition Driven by Photoinduced Melting of Charge and Orbital Order

被引：101

作者：

Beaud, P. ^{[1
]}

Johnson, S. L. ^{[1
]}

Vorobeva, E. ^{[1
]}

Staub, U. ^{[1
]}

De Souza, R. A. ^{[1
]}

Milne, C. J. ^{[2
]}

Jia, Q. X. ^{[3
]}

Ingold, G. ^{[1
]}

机构：

[1] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[2] Ecole Polytech Fed Lausanne, Lab Spect Ultrarapide, CH-1015 Lausanne, Switzerland

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 15期

关键词：

METAL TRANSITION;

D O I：

10.1103/PhysRevLett.103.155702

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use femtosecond x-ray diffraction to probe directly the structural dynamics of a charge ordered and orbitally ordered thin film of La0.42Ca0.58MnO3 initiated by an ultrafast optical pulse. At low excitation fluences we observe the displacive excitation of a coherent optical A(g) phonon. Under high excitation conditions we observe a complete phase transition within 1 ps via the disappearance of a superlattice reflection. The initial step of the phase transition occurs on a time scale significantly faster than the 200 fs time resolution of our experiment.

引用

页数：4

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