Bulk Evidence for s-Wave Pairing Symmetry in the n-Type Infinite-Layer Cuprate $S{r}_{0.9}L{a}_{0.1}Cu{O}_2$

Abstract

Low temperature specific heat of the electron-doped (n-type) infinite-layer cuprate $S{r}_{0.9}L{a}_{0.1}Cu{O}_2$ has been measured. The quasiparticle density of states (DOS) in the mixed state is found to be consistent with the feature of the s-wave pairing symmetry, agreeing very well with the earlier tunnelling measurement, but being contrary to the d-wave symmetry well confirmed for the hole-doped (p-type) cuprates. Our results indicate that the electronic DOS are mainly contributed by the vortex cores in the present sample being contrast to the p-type cuprates in which the vortex cores are abnormal and contribute very limited low energy DOS as evidenced by many means.

4 pages, 4 figures

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• Zero-field superfluid density in d-wave superconductor evaluated from the results of muon-spin-rotation experiments in the mixed state
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• Penetration depth of electron-doped-infinite-layer Sr${}_{0.88}$La${}_{0.12}$CuO${}_{2+x}$ thin films
• Topological phase transition from nodal to nodeless d-wave superconductivity in electron-doped cuprate superconductors
• Magnetic phases of electron-doped infinite-layer Sr${}_{1-x}$La${}_x$CuO${}_2$ from first-principles density functional calculations