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Phys. Rev. B 63, 113105 (2001) [4 pages]

Dynamics of photoinduced melting of charge/orbital order in a layered manganite La0.5Sr1.5MnO4

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T. Ogasawara1,2, T. Kimura1,3, T. Ishikawa1,*, M. Kuwata-Gonokami1, and Y. Tokura1,2,3
1Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
2Correlated Electron Research Center (CERC), Tsukuba 305-0046, Japan
3Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-0046, Japan

Received 7 August 2000; published 1 March 2001

Photoinduced effects on the charge- and orbital-ordered (CO/OO) states in a layered perovskite manganite La0.5Sr1.5MnO4 have been investigated with femtosecond polarization-sensitive pump-probe spectroscopy. Disappearance of the optical birefringence as well as conspicuous change of the optical spectrum indicates the immediate destruction of the CO/OO states upon photoexcitation. A large difference in the temporal evolution of the birefringence and the reflectivity change was observed, indicating that the adiabatic, fast (<200fs) photomelting of the CO/OO states is followed by slow (10 ps–10 ns) evolution of the lattice disorder, which is subject to the critical slowing down effect as the temperature approaches TCO=220K.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.63.113105
DOI:
10.1103/PhysRevB.63.113105
PACS:
78.47.+p, 73.22.-f, 71.30.+h

*Present address: Department of Chemistry and Materials Science, Tokyo Institute of Technology, Tokyo 152-8551, Japan.

 
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