| Автор | Dinesh Varshney |
| Автор | G S Patel |
| Автор | R K Singh |
| Дата выпуска | 2000-09-01 |
| dc.description | We have evolved an effective two-dimensional dynamic interaction, which embodies the screening of electrons by optical phonons and by plasmons to confer the attributes of the pairing mechanism leading to superconductivity in layered electron-doped cuprates. The electron-doped Nd-Ce-CuO cuprate behaves as an ionic solid containing isolated CuO<sub>2</sub> layers of electrons as carriers, and a model dielectric function is set up that fulfils the appropriate sum rules on the electronic and ionic polarizabilities. Following strong coupling theory, the superconducting transition temperature of optimally-doped Nd-Ce-CuO is estimated as 28 K and the energy gap ratio is larger than the Bardeen-Cooper-Schrieffer value. The isotope effect exponent, coherence length and magnetic penetration depth are also estimated. Ziman's formula of resistivity is employed for analysis and a comparison is made with the temperature-dependent resistivity of a single crystal. The estimated phonon contribution together with the residual resistivity is lower than the reported data. The subtracted data infers a clear quadratic temperature dependence from T<sub>c</sub> to near to room temperature. The implications of the model and its analysis are discussed. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Superconductivity and normal state in-plane resistivity of electron-doped cuprates Nd-Ce-CuO: screened optical-phonon approach |
| Тип | paper |
| DOI | 10.1088/0953-2048/13/9/310 |
| Electronic ISSN | 1361-6668 |
| Print ISSN | 0953-2048 |
| Журнал | Superconductor Science and Technology |
| Том | 13 |
| Первая страница | 1345 |
| Последняя страница | 1355 |
| Выпуск | 9 |
