s-wave superconductivity in optimally doped SrTi1−xNbxO3 unveiled by electron irradiation

Xiao Lin; Carl Willem Rischau; Cornelis J. van der Beek; Benoît Fauqué; Kamran Behnia

doi:10.1103/PhysRevB.92.174504

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s-wave superconductivity in optimally doped SrTi1−xNbxO3 unveiled by electron irradiation

Xiao Lin, Carl Willem Rischau, Cornelis J. van der Beek, Benoît Fauqué, Kamran Behnia

DOI 10.1103/PhysRevB.92.174504 · Physical Review B

T1

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Abstract

We report on a study of electric resistivity and magnetic susceptibility measurements in electron irradiated SrTi0.987Nb0.013O3 single crystals. Pointlike defects, induced by electron irradiation, lead to an almost threefold enhancement of the residual resistivity, but barely affect the superconducting critical temperature (Tc). 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 (ξ) and the deduced intrinsic coherence length (ξ0) is close to the BCS coherence length (ξBCS). Combined with thermal conductivity data pointing to multiple nodeless gaps, the current results identify optimally doped SrTi1−xNbxO3 as a multiband s-wave superconductor.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
SrTi0.987Nb0.013O3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.37	Pressure not reported	onset
SrTi0.987Nb0.013O3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.435	Pressure not reported	zero_resistance