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Photo-excitation of Single-Crystals of La2CuO4+d Near the Metal-Insulator-Transition
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Yu, G. | - |
dc.contributor.author | Lee, Changhee | - |
dc.contributor.author | Heeger, A. J. | - |
dc.contributor.author | Cheong, S. W. | - |
dc.contributor.author | Fisk, Z. | - |
dc.date.accessioned | 2009-11-19T22:38:50Z | - |
dc.date.available | 2009-11-19T22:38:50Z | - |
dc.date.issued | 1992 | - |
dc.identifier.citation | Physica C 190 (1992) 563 | en |
dc.identifier.issn | 0921-4534 | - |
dc.identifier.uri | https://hdl.handle.net/10371/13664 | - |
dc.description.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. | en |
dc.language.iso | en | en |
dc.publisher | Elsevier | en |
dc.title | Photo-excitation of Single-Crystals of La2CuO4+d Near the Metal-Insulator-Transition | en |
dc.type | Article | en |
dc.contributor.AlternativeAuthor | 이창희 | - |
dc.identifier.doi | 10.1016/0921-4534(92)90719-S | - |
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