SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Unconventional Superconductors
TT 19.2: Vortrag
Donnerstag, 30. September 2021, 11:30–11:45, H6
Spatially intertwined superconductivity and charge order in 1T-TaSSe revealed by scanning tunnelling spectroscopy — •Yaroslav Gerasimenko1,2, Marion van Midden2, Erik Zupanic2, Petra Sutar2, Zvonko Jaglicic3, and Dragan Mihailovic2,3 — 1University of Regensubrg, Regensburg, Germany — 2Jozef Stefan Institute, Ljubljana, Slovenia — 3Univeristy of Ljubljana, Ljubljana, Slovenia
The interplay of different emergent phenomena - superconductivity (SC) and domain formation - appearing on different spatial and energy scales are investigated using high-resolution scanning tunnelling spectroscopy in the prototypical transition metal dichalcogenide superconductor 1T-TaSSe single crystals (TSC = 3.5 K) at temperatures from 1 to 20 K. Our major observation is that while the SC gap size smoothly varies on the scale of 10 nm, its spatial distribution is not correlated to the domain structure. On the other hand, there is statistically significant correlation of the SC gap ΔSC with spectral weight of the narrow band at the Fermi level formed from the same Ta 5d orbitals as the Mott-Hubbard band. We show that the narrow band follows the evolution of Hubbard bands in space, proving unambiguously its relation to the charge order. The correlations between the two suggest a non-trivial link between rapidly spatially varying charge order and superconductivity common in many quantum materials, and high-temperature superconductors in particular.