Quantum Vortex Core and Missing Pseudogap in the Multiband BCS-BEC Crossover Superconductor FeSe

T. Hanaguri, S. Kasahara, J. Böker, I. Eremin, T. Shibauchi, Y. Matsuda

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number077001
JournalPhysical Review Letters
Volume122
Issue number7
DOIs
Publication statusPublished - Feb 21 2019
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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