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TT: Fachverband Tiefe Temperaturen
TT 68: Superconductivity: Properties and Electronic Structure
TT 68.9: Talk
Thursday, March 21, 2024, 11:45–12:00, H 3010
Engineering interband coupling of a two-band superconductor by topological defects — •Qili Li1, Thomas Gozlinski1, Ryohei Nemoto2, Toyo Kazu Yamada2, Jörg Schmalian1, and Wulf Wulfhekel1 — 1Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Chiba University, Chiba, Japan
Two-band or multiband superconductors like MgB2, Fe-based superconductors, NbSe2 and Pb [1,2] are in great interest. Fantastic properties are predicted owing to interband coupling in multiband superconductors, such as solitons, vortices with fractional flux, non-Abrikosov vortices, topological knot and odd-frequency pairing. Here, we investigate interband coupling in the two-band superconductor Pb by scanning tunnelling microscopy at 45 mK. We find that the interband coupling is significantly changed by topological defects, i.e., stacking fault tetrahedrons widely existing in face centered cubic crystals. Intra- and interband coupling are directly spatially resolved by fitting our experimental results self-consistently with Schopohl-Scharnberg-McMillan (SSM) model [3,4]. Our findings pave the way to explore the predicted properties in multiband superconductors.
[1] Phys. Rev. Lett. 114 (2015) 157001.
[2] Sci. Adv. 9, eadh9163 (2023).
[3] Phys. Rev. 175 (1968) 537.
[4] Solid State Commun. 22 (1977) 37 1-374.
Keywords: Superconductivity; Two-band superconductor; Interband coupling; Topological defects; Stacking fault tetrahedron