Multiple nodeless superconducting gaps in optimally doped SrTi1−xNbxO3
Xiao Lin, Adrien Gourgout, German Bridoux, François Jomard, Alexandre Pourret, Benoît Fauqué, Dai Aoki, Kamran Behnia
DOI 10.1103/PhysRevB.90.140508 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We present a study of thermal conductivity in superconducting SrTi1−xNbxO3, sufficiently doped to be near its maximum critical temperature. The bulk critical temperature, determined by the jump in specific heat, occurs at a significantly lower temperature than the resistive Tc. Thermal conductivity, dominated by the electron contribution, deviates from its normal-state magnitude at bulk Tc, following a Bardeen-Rickayzen-Tewordt behavior, which is expected for thermal transport by Bogoliubov excitations. The absence of a T-linear term at very low temperatures rules out the presence of nodal quasiparticles. On the other hand, the field dependence of thermal conductivity points to the existence of at least two distinct superconducting gaps. We conclude that optimally doped strontium titanate is a multigap nodeless superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SrTi1-xNbxO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.44 | Pressure not reported | onset |
| SrTi1-xNbxO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.33 | Pressure not reported | onset |
Similar papers
Strain-engineered interaction of quantum polar and superconducting phases
similarity 0.95Chloe Herrera et al.
Source status unknown — claims are unverified
s-wave superconductivity in optimally doped SrTi1−xNbxO3 unveiled by electron irradiation
similarity 0.95Xiao Lin et al.
Source status unknown — claims are unverified
Single-Gap Superconductivity and Dome of Superfluid Density in Nb-Doped SrTiO3
similarity 0.95Markus Thiemann et al.
Source status unknown — claims are unverified
Superconducting Tunneling Spectroscopy of Spin-Orbit Coupling and Orbital Depairing in Nb:SrTiO3
similarity 0.94Adrian G. Swartz et al.
Source status unknown — claims are unverified
Induced ferroelectricity and enhanced superconductivity through B-site doped SrTi1−xZrxO3
similarity 0.92Stephen Zhang et al.
Source status unknown — claims are unverified
Multiple nodeless superconducting gaps in optimally-doped SrTiNbO
similarity 0.92Xiao Lin et al. · 2014 · arXiv:1409.2423
Source status unknown — claims are unverified