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Phys. Rev. Lett. 78, 4257 - 4260 (1997)

Photoinduced Insulator-to-Metal Transition in a Perovskite Manganite

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K. Miyano1, T. Tanaka1, Y. Tomioka2, and Y. Tokura1,2
1Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
2Joint Research Center for Atomic Technology (JRCAT), Tsukuba 305, Japan

Received 3 March 1997

We have observed an insulator-to-metal (I-M) transition triggered by the photocarrier injection into the charge-ordered (CO) state of a perovskite manganite crystal, Pr0.7Ca0.3MnO3. The photocurrent is a highly nonlinear function of applied electric field and of light intensity; both show a threshold behavior for the I-M transition. The dependence of the anomalous photocurrent on the excitation photon energy and the temperature excludes the laser heating as the cause of the effect, suggesting the photocarrier-mediated collapse of the CO state.


©1997 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.78.4257
DOI: 10.1103/PhysRevLett.78.4257
PACS: 71.30.+h, 71.28.+d, 72.40.+w

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