Transient photoinduced conductivity in single crystals of YBa2Cu3O6.3: ‘‘Photodoping’’ to the metallic state

G. Yu, C. H. Lee, A. J. Heeger, N. Herron, and E. M. McCarron
Phys. Rev. Lett. 67, 2581 – Published 28 October 1991
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Abstract

The temperature dependences of the transient photoinduced conductivity in YBa2Cu3O7δ at different light intensities (IL) and of the doping-induced conductivity at different δ are similar, indicative of ‘‘photodoping.’’ For δ≊0.7, signatures of the photoinduced transition to metallic behavior are observed at IL>5×1015 photons/cm2; the deep resistivity minimum below 100 K, reminiscent of the onset of superconductivity in granular superconductors and in inhomogeneously doped samples, is interpreted in terms of phase separation and metallic-droplet formation. A longitudinal magnetic field (≤0.5 T) reduces both the resistivity minimum and the superlinear contribution to the transient photoconductance. For δ≊0.6, the lifetime of the photoexcited state is enhanced by nearly 3 orders of magnitude at high excitation levels, indicative of metastability.

  • Received 15 January 1991

DOI:https://doi.org/10.1103/PhysRevLett.67.2581

©1991 American Physical Society

Authors & Affiliations

G. Yu, C. H. Lee, and A. J. Heeger

  • Institute for Polymers and Organic Solids, University of California, Santa Barbara, Santa Barbara, California 93106

N. Herron and E. M. McCarron

  • E. I. du Pont de Nemours and Company, Inc., Central Research Development Department, Wilmington, Delaware 19898

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Vol. 67, Iss. 18 — 28 October 1991

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