Experimental evidence for strong electron-phonon coupling to selected phonon modes in point-contact spectroscopy of YBa2Cu3O7−δ
| Autor: | I. Monot, Yoad Yagil, G. Desgardin, Nir Hass |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Phonon Energy Engineering and Power Technology Condensed Matter Physics Electronic Optical and Magnetic Materials Andreev reflection Condensed Matter::Superconductivity Electrical and Electronic Engineering Thin film Spectroscopy Single crystal Boson Second derivative |
| Zdroj: | Physica C: Superconductivity. 250:59-66 |
| ISSN: | 0921-4534 |
| Popis: | Point-contact spectroscopy measurements on several YBa 2 Cu 3 O 7−δ samples (melt-textured, single crystal, and thin film) reveal Andreev reflection with a rather sharp gap edge as well as strong modulations at yet higher bias. The boson energies obtained by the second derivative d 2 V /d I 2 ( V ) are in good correlation with selected phonon modes which, in turn, were reported to renormalize below the superconducting transition temperature T c . The experimental data suggest a strong electron-phonon interaction; however, YBCO is still qualitatively different from conventional superconductors since the modulations at high energies are extremely strong, and only selected phonon modes are coupled. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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