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

Article

关键词: PURITY DEPENDENCE;    TEMPERATURE;    TRANSITION;    SUPPRESSION;    DEPRESSION;    DEFECTS;    SPIN;    MGB2;   

DOI  :  10.1103/PhysRevB.92.174504

来源: SCIE

【 摘 要 】

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 (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 intrinsic coherence length (xi(0)) is close to the BCS coherence length (xi(BCS)). Combined with thermal conductivity data pointing to multiple nodeless gaps, the current results identify optimally doped SrTi1-xNbxO3 as a multiband s-wave superconductor.

【 授权许可】

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