Photoinduced Insulator-to-Metal Transition in a Perovskite Manganite

Journal Article · Sun Jun 01 00:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.4257· OSTI ID:509081

Miyano, K; Tanaka, T; Tokura, Y ^[1]; Tomioka, Y; Tokura, Y ^[2]

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1. Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113 (Japan)
2. Joint Research Center for Atomic Technology (JRCAT), Tsukuba 305 (Japan)

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, Pr{sub 0.7}Ca {sub 0.3}MnO {sub 3}. 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. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 509081
• Journal Information: Physical Review Letters, Vol. 78, Issue 22; Other Information: PBD: Jun 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MANGANESE OXIDES
CHARGE CARRIERS
PHOTOCURRENTS
ELECTRIC CONDUCTIVITY
PRASEODYMIUM OXIDES
CALCIUM OXIDES
PEROVSKITES