Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.17: Poster
Montag, 17. März 2025, 15:00–18:00, P4
Two-Gap Superconductivity in the Noncentrosymmetric La3Se4 — f košuth1,2, n potomová2, z pribulová1, j kacmarcík1, •m naskar3, d s inosov3, s ash4, a k ganguli5, j soltýs6, v cambel6, p szabó1, and p samuely1 — 1Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences, SK04001 Košice, Slovakia — 2Centre of Low Temperature Physics, Faculty of Science, P. J. Šafárik University, SK-04001 Košice, Slovakia — 3Institut für Festkörper und Materialphysik, Technische Universität Dresden, D-01069 Dresden, Germany — 4Institute for Solid State Research, Leibniz IFW Dresden, D-01069 Dresden, Germany — 5Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110016, India — 6Institute of Electrical Engineering, Slovak Academy of Sciences, Bratislava SK84104, Slovakia
Point-contact Andreev reflection spectroscopy at low temperatures and high magnetic field has been carried out on the noncentrosymmetric superconductor La3Se4 (Tc = 8 K). Two superconducting energy gaps Δ1 and Δ2, with 2Δ1/kBTc = 5.8 and 2Δ2/kBTc = 2.3, are directly observed in certain spectra. The effects of temperature and magnetic fields help to distinguish a two-gap structure, even in the more common spectra where only a single gap is visible at low temperatures, indicated by a pair of maxima around zero bias. The presence of two-gap superconductivity, consistent with the results from point-contact Andreev reflection spectroscopy, is further confirmed by heat capacity and Hall probe magnetization measurements.
Keywords: Noncentro symmetric superconductor; Two-gap superconductivity