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Evidence for superconductivity with broken time-reversal symmetry in locally noncentrosymmetric SrPtAs
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Biswas, P. K., Luetkens, H., Neupert, T., Stürzer, T., Baines, C., Pascua, G., Schnyder, A. P., Fischer, M. H., Goryo, J., Lees, Martin R., Maeter, H., Brückner, F., Klauss, H.-H., Nicklas, M., Baker, Peter J., Hillier, A. D., Sigrist, M., Amato, A. and Johrendt, D. (2013) Evidence for superconductivity with broken time-reversal symmetry in locally noncentrosymmetric SrPtAs. Physical Review B (Condensed Matter and Materials Physics), Volume 87 (Number 18). Article number 180503(R). doi:10.1103/PhysRevB.87.180503 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.87.180503
Abstract
We report the magnetic and superconducting properties of locally noncentrosymmetric SrPtAs obtained by muon-spin-rotation/relaxation (μSR) measurements. Zero-field μSR reveals the occurrence of small spontaneous static magnetic fields with the onset of superconductivity. This finding suggests that the superconducting state of SrPtAs breaks time-reversal symmetry. The superfluid density as determined by transverse field μSR is nearly flat approaching T=0 K proving the absence of extended nodes in the gap function. By symmetry, several superconducting states supporting time-reversal-symmetry breaking in SrPtAs are allowed. Out of these, a dominantly d+id (chiral d-wave) order parameter is most consistent with our experimental data.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1098-0121 | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 87 | ||||
Number: | Number 18 | ||||
Page Range: | Article number 180503(R) | ||||
DOI: | 10.1103/PhysRevB.87.180503 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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