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Phys. Rev. B 64, 100401(R) (2001) [4 pages]

Critical behavior of a photodisordered spin system in doped manganite

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X. J. Liu
CIRSE, Nagoya University, Nagoya 464-8601, Japan

Y. Moritomo*
CIRSE, Nagoya University, Nagoya 464-8601, Japan
PRESTO, JST, Tokyo 102-0074, Japan

A. Nakamura
CIRSE, Nagoya University, Nagoya 464-8601, Japan

H. Tanaka and T. Kawai
Institute of Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan

Received 29 May 2001; published 7 August 2001

Dynamics of the spin system has been investigated in a ferromagnetic La0.7Ca0.3MnO3 film by means of a time-resolved pump-probe method. In a weak excitation condition, the relaxation time τ increases critically on approaching the critical temperature TC(=262 K) from the low-temperature side as τ∝|T/TC-1|-1.39 for T≳200 K. Surprisingly, the same scaling relation holds even after strong excitation in a much wider temperature range down to ∼10 K. We will discuss these behaviors in terms of photoinduced growth of the charge-ordering fluctuations.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.64.100401
DOI:
10.1103/PhysRevB.64.100401
PACS:
75.30.Vn, 78.47.+p

*Author to whom correspondence should be addressed.

 
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