2019/01/26 by T. Hanaguri, S. Kasahara, J. Böker +5 · 71 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Cuprate #Iron-based superconductors research #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Quantum tunnelling #Quasiparticle #Scanning tunneling microscope #Superconductivity #Superconductivity in MgB2 and Alloys #Vortex #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.122.077001
published in Physical Review Letters 122(7), 077001 (American Physical Society) · 5 pages, 4 figures. To appear in PRL. Supplemental Material is available at http://www.riken.jp/epmrt/Hanaguri/SI/FeSe_Vortex_Tdep_SM.pdf
arxiv created 2019/01/26 · openalex publication_date 2019/02/21 · arxiv updated 2019/02/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
FeSe is argued as a superconductor in the Bardeen-Cooper-Schrieffer Bose-Einstein condensation crossover regime where the superconducting gap size and the superconducting transition temperature Tc are comparable to the Fermi energy. In this regime, vortex bound states should be well quantized and the preformed pairs above Tc may yield a pseudogap in the quasiparticle-excitation spectrum. We performed spectroscopic-imaging scanning tunneling microscopy to search for these features. We found Friedel-like oscillations near the vortex, which manifest the quantized levels, whereas the pseudogap was not detected. These apparently conflicting observations may be related to the multiband nature of FeSe.