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Observation of a Hidden Hole-Like Band Approaching the Fermi Level in K-Doped Iron Selenide Superconductor.
- Source :
- Journal of the Physical Society of Japan; 2016, Vol. 85 Issue 7, p073704-1-073704-5, 5p
- Publication Year :
- 2016
-
Abstract
- One of the ultimate goals of the study of iron-based superconductors is to identify the common feature that produces the high critical temperature (T<subscript>c</subscript>). In the early days, based on a weak-coupling viewpoint, the nesting between hole- and electron-like Fermi surfaces (FSs) leading to the so-called s± state was considered to be one such key feature. However, this theory has faced a serious challenge ever since the discovery of alkali-metal-doped FeSe (AFS) superconductors, in which only electron-like FSs with a nodeless superconducting gap are observed. Several theories have been proposed, but a consistent understanding is yet to be achieved. Here we show experimentally that a hole-like band exists in K<subscript>x</subscript>Fe<subscript>2-y</subscript>Se<subscript>2</subscript>, which presumably forms a hole-like Fermi surface. The present study suggests that AFS can be categorized in the same group as iron arsenides with both hole- and electron-like FSs present. This result provides a foundation for a comprehensive understanding of the superconductivity in iron-based superconductors. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00319015
- Volume :
- 85
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Journal of the Physical Society of Japan
- Publication Type :
- Academic Journal
- Accession number :
- 116787102
- Full Text :
- https://doi.org/10.7566/JPSJ.85.073704