Multigap Superconductivity at Extremely High Temperature: A Model for the Case of Pressurized H2S
详细信息 查看全文
- 作者：A. Bussmann-Holder ; J. Köhler ; A. Simon…
- 关键词：Pressurized H2S ; Multigap superconductivity ; Isotope effect
- 刊名：Journal of Superconductivity and Novel Magnetism
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：30
- 期：1
- 页码：151-156
- 全文大小：
- 刊物类别：Physics and Astronomy
- 刊物主题：Strongly Correlated Systems, Superconductivity; Magnetism, Magnetic Materials; Condensed Matter Physics; Characterization and Evaluation of Materials;
- 出版者：Springer US
- ISSN：1557-1947
- 卷排序：30
文摘
It is known that in pressurized H2S, the complex electronic structure in the energy range of 200 meV near the chemical potential can be separated into two electronic components: the first characterized by steep bands with a high Fermi velocity and the second by flat bands with a vanishing Fermi velocity. Also, the phonon modes interacting with electrons at the Fermi energy can be separated into two components: hard modes with high energy around 150 meV and soft modes with energies around 60 meV. Therefore, we discuss here a multiband scenario in the standard Bardeen–Cooper–Schrieffer (BCS) approximation where the effective BCS coupling coefficient is in the range 0.1–0.32. We consider a first (second) BCS condensate in the strong (weak) coupling regime 0.32 (0.15). We discuss different scenarios segregated in different portions of the material. The results show the phenomenology of unconventional superconducting phases in this two-gap superconductivity scenario where there are two electronic components in two Fermi surface spots, and the pairing is mediated by either a soft or a hard phonon branch where the interband exchange term, also if small, plays a key role for the emergence of high-temperature superconductivity in pressurized sulfur hydride.