Energy gap evolution across the superconductivity dome in single crystals of (Ba_1-x K _x )Fe₂As₂.

ABSTRACT: The mechanism of unconventional superconductivity in iron-based superconductors (IBSs) is one of the most intriguing questions in current materials research. Among non-oxide IBSs, (Ba_1-x K _x )Fe₂As₂ has been intensively studied because of its high superconducting transition temperature and fascinating evolution of the superconducting gap structure from being fully isotropic at optimal doping (x ≈ 0.4) to becoming nodal at x > 0.8. Although this marked evolution was identified in several independent experiments, there are no details of the gap evolution to date because of the lack of high-quality single crystals covering the entire K-doping range of the superconducting dome. We conducted a systematic study of the London

SUBMITTER: Cho K 

PROVIDER: S-EPMC5045271 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature