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Photo-excitation of Single-Crystals of La2CuO4+d Near the Metal-Insulator-Transition
Cited 17 time in
Web of Science
Cited 14 time in Scopus
- Authors
- Issue Date
- 1992
- Publisher
- Elsevier
- Citation
- Physica C 190 (1992) 563
- Abstract
- Transient photoconductivity (σph) experiments have been carried out in single crystals of insulating La2CuO4+δ near the metal-insulator transition (δ≈ 1–2%). The time evolution of the σph changes dramatically with light intensity (IL). At low IL, σph is characterized by power law time decay, t−α, in the nanosecond time regime, and the exponent, α, decreases significantly with increasing IL. As IL increases to 5 × 1015 photons/cm2, σph reaches 15 S/cm, and the lifetime of the conducting state is enhanced by more than two orders of magnitude: σph exhibits a delayed peak centered at approximately 30 ns. followed by exponential decay with time constant of 360 ns. The data reveal a continuous distribution of localized electronic states above the (hole) mobility edge; the M-I transition is achieved when the Fermi level is shifted away from the localized states and across the mobility edge either by chemical dopiing or by photo-excitation. The time of σph at high IL implies the formation of metastable metallic droplets after photo-excitation.
- ISSN
- 0921-4534
- Language
- English
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