2012/05/03 by Y. S. Li, Jason Luo, J. Y. Luo +11
Engineering · Materials Science · Physics and Astronomy · #Chalcogenide Semiconductor Thin Films #FOS: Physical sciences #Iron-based superconductors research #Materials Science (cond-mat.mtrl-sci) #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.1205.0687
17 pages, 7 figures, submitted
arxiv created 2012/05/03 · openalex publication_date 2012/05/03 · arxiv updated 2012/05/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Based upon the currently predominant theory of Fe-based superconductors, the order parameter symmetry is the nodaless s±-wave. Andreev conductance involving normal metals and such superconductors does not have a zero bias conductance peak (ZBCP) except maybe for a very narrow range of a junction-dependent fitting parameter. We have measured differential conductance of the in-plane boundary junctions between Au and superconducting FeSe0.3Te0.7 films. The Au/FeSe0.3Te0.7 ramp-type junctions are fabricated with the bias current direction along the <110> axis of the epitaxial FeSe0.3Te0.7 film. We have always observed a pronounced ZBCP as well as some gap-like features in the conductance spectra of all samples studied, thus our experimental results suggest not the s±-wave theory but the possible existence of a nodal point around 45° in at least one of the gaps in FeSe0.3Te0.7 superconductor.