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Transient Photoinduced Conductivity in Single-Crystals of YBa2Cu3O7-d: Photodoping to the Metallic State

Cited 89 time in Web of Science Cited 90 time in Scopus
Authors
Yu, G.; Lee, Changhee; Heeger, A. J.; Herron, N.; McCarron, E. M.
Issue Date
1991-10-28
Publisher
American Physical Society
Citation
Phys. Rev. Lett. 67, 2581
Abstract
The temperature dependences of the transient photoinduced conductivity in YBa2Cu3O7-δ 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.
ISSN
0031-9007
Language
English
URI
https://hdl.handle.net/10371/13779
DOI
https://doi.org/10.1103/PhysRevLett.67.2581
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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