S-wave Superconductivity in Optimally Doped SrTi${}_{1-x}$Nb${}_x$O${}_3$ Unveiled by Electron Irradiation

Abstract

We report on a study of electric resistivity and magnetic susceptibility measurements in electron irradiated SrTi${}_{0.987}$Nb${}_{0.013}$O${}_3$ single crystals. Point-like defects, induced by electron irradiation, lead to an almost threefold enhancement of the residual resistivity, but barely affect the superconducting critical temperature ($T_c$). The pertinence of Anderson's theorem provides strong evidence for a s-wave superconducting order parameter. Stronger scattering leads to a reduction of the effective coherence length ($\xi$) and the deduced coherence length in the clean limit (${\xi }_0$) is around the BCS coherence length (${\xi }_{BCS}$). Combined with thermal conductivity data pointing to multiple nodeless gaps, the current results identify optimally doped SrTi${}_{1-x}$Nb${}_x$O${}_3$ as a multi-band s-wave superconductor.

5 pages, 4 figures

References in corpus (3)

• Fermi surface of the most dilute superconductor
• Scalable T^2 resistivity in a small single-component Fermi surface
• Multiple nodeless superconducting gaps in optimally-doped SrTi${}_{1-x}$Nb${}_x$O${}_3$

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