Single-Gap Superconductivity and Dome of Superfluid Density in Nb-Doped SrTiO3
Markus Thiemann, Manfred H. Beutel, Martin Dressel, Nicholas R. Lee-Hone, David M. Broun, Evangelos Fillis-Tsirakis, Hans Boschker, Jochen Mannhart, Marc Scheffler
DOI 10.1103/PhysRevLett.120.237002 · Physical Review Letters
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Abstract
SrTiO3 exhibits a superconducting dome upon doping with Nb, with a maximum critical temperature Tc≈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 2.2×1020 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 2Δ due to gap homogenization over the Fermi surface consistent with the low level of defect scattering in Nb-doped SrTiO3. Furthermore, we determine Tc, 2Δ, and the superfluid density as a function of charge carrier concentration, and all three quantities exhibit the characteristic dome shape.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.4 | Pressure not reported | unknown |
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