Phys. Rev. Lett. 78, 4257–4260 (1997)Photoinduced Insulator-to-Metal Transition in a Perovskite ManganiteReceived 3 March 1997; published in the issue dated 2 June 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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