Single-Gap Superconductivity and Dome of Superfluid Density in Nb-Doped SrTiO3

Thiemann, M.; Beutel, M. M.; Dressel, M.; Lee-Hone, N. R.; Broun, D. M.; Fillis-Tsirakis, E.; Boschker, H.; Mannhart, J.; Scheffler, M.

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Single-Gap Superconductivity and Dome of Superfluid Density in Nb-Doped SrTiO₃

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Mannhart, J.
Department Solid State Quantum Electronics (Jochen Mannhart), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Thiemann, M., Beutel, M. M., Dressel, M., Lee-Hone, N. R., Broun, D. M., Fillis-Tsirakis, E., et al. (2018). Single-Gap Superconductivity and Dome of Superfluid Density in Nb-Doped SrTiO₃. Physical Review Letters, 120(23): 237002.

Cite as: https://hdl.handle.net/21.11116/0000-000E-D22E-2

Abstract

SrTiO3 exhibits a superconducting dome upon doping with Nb, with a maximum critical temperature T-c approximate to 0.4 K. Using microwave stripline resonators at frequencies from 2 to 23 GHz and temperatures down to 0.02 K, we probe the low-energy optical response of superconducting SrTiO3 with a charge carrier concentration from 0.3 to 2.2 x 10(20) cm(-3), covering the majority of the superconducting dome. We find single-gap electrodynamics even though several electronic bands are superconducting. This is explained by a single energy gap 2 Delta due to gap homogenization over the Fermi surface consistent with the low level of defect scattering in Nb-doped SrTiO3. Furthermore, we determine T-c, 2 Delta, and the superfluid density as a function of charge carrier concentration, and all three quantities exhibit the characteristic dome shape.