Saturation of the photoresponse in Nd0.67Sr0.37MnO3−δ epitaxial layers close to the metal–insulator transition
| Autor: | R.v. Helmolt, J. Liebe, A. Kattwinkel, G.H. Rao, L. Haupt, E. Gommert, R. Braunstein, K. Bärner, Joachim Dr. Wecker |
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| Rok vydání: | 1999 |
| Předmět: |
Materials science
Magnetoresistance Condensed matter physics Ambipolar diffusion Charge density 02 engineering and technology Electron hole 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Electrical resistivity and conductivity 0103 physical sciences Thermoelectric effect Electrical and Electronic Engineering Metal–insulator transition 010306 general physics 0210 nano-technology Saturation (magnetic) |
| Zdroj: | Physica B: Condensed Matter. 271:15-20 |
| ISSN: | 0921-4526 |
| Popis: | Internal electrical fields of different origin are observed in the semiconducting regime of Nd2/3Sr1/3MnO3−δ epitaxial layers and are assigned to thermoelectric effects and to an ambipolar charge distribution in trap states, following a photogeneration of electron–hole pairs. In particular, if the resistivity shows a double peak, the photoresponse shows saturation in the regime of the low-temperature peak, suggesting the existence of a gap in the transitional regime of the metal–insulator transition. |
| Databáze: | OpenAIRE |
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