| Автор | Migaku Oda |
| Автор | Naoki Momono |
| Автор | Masayuki Ido |
| Дата выпуска | 2000-11-01 |
| dc.description | For the understanding of the mechanism of a superconducting transition, it is of great interest to clarify what the energy scale in determining the critical temperature T<sub>c</sub> is. According to the BCS mean-field theory, the energy gap at T<<T<sub>c</sub>, 2Δ<sub>o</sub>, is proportional to T<sub>c</sub>; 2Δ<sub>o</sub> = 4.3k<sub>B</sub>T<sub>c</sub> for d-wave superconductors. In the case of high-T<sub>c</sub> cuprates, however, 2Δ<sub>o</sub> increases monotonically with the lowering of the hole-doping level p even in the underdoped region, where T<sub>c</sub> is largely suppressed, and does not scale with T<sub>c</sub>, except in a highly overdoped region. Interestingly, in a wide p range spreading over the under- and overdoped regions, 2Δ<sub>o</sub> is almost proportional to crossover temperature T*, around which a spin gap and/or a (small) pseudogap of almost the same energy scale as 2Δ<sub>o</sub> start to develop progressively; 2Δ<sub>o</sub>/k<sub>B</sub>T* is nearly independent of p and comparable to the BCS value in the entire p range examined. On the other hand, 2Δ<sub>o</sub>/k<sub>B</sub>T<sub>c</sub> is inversely proportional to p, 2Δ<sub>o</sub>/k<sub>B</sub>T<sub>c</sub>~1/p, except in the highly overdoped region, where T<sub>c</sub> is very close to the BCS expectation. This indicates that the energy scale in determining T<sub>c</sub> is of order pΔ<sub>o</sub> in high-T<sub>c</sub> cuprates. In this article, we will discuss some scenarios for the transition from pseudogap to superconducting states, where the energy scale in determining T<sub>c</sub> is expected to be of order pΔ<sub>o</sub>. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | What is the energy scale in determining the T<sub>c</sub> of cuprate superconductivity? |
| Тип | rev |
| DOI | 10.1088/0953-2048/13/11/201 |
| Electronic ISSN | 1361-6668 |
| Print ISSN | 0953-2048 |
| Журнал | Superconductor Science and Technology |
| Том | 13 |
| Первая страница | R139 |
| Последняя страница | R146 |
| Аффилиация | Migaku Oda; Department of Physics, Hokkaido University, Sapporo 060-0810, Japan |
| Аффилиация | Naoki Momono; Department of Physics, Hokkaido University, Sapporo 060-0810, Japan |
| Аффилиация | Masayuki Ido; Department of Physics, Hokkaido University, Sapporo 060-0810, Japan |
| Выпуск | 11 |
