• Rapid Communication

Evidence for superconductivity with broken time-reversal symmetry in locally noncentrosymmetric SrPtAs

P. K. Biswas, H. Luetkens, T. Neupert, T. Stürzer, C. Baines, G. Pascua, A. P. Schnyder, M. H. Fischer, J. Goryo, M. R. Lees, H. Maeter, F. Brückner, H.-H. Klauss, M. Nicklas, P. J. Baker, A. D. Hillier, M. Sigrist, A. Amato, and D. Johrendt
Phys. Rev. B 87, 180503(R) – Published 13 May 2013

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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 14 December 2012

DOI:https://doi.org/10.1103/PhysRevB.87.180503

©2013 American Physical Society

Authors & Affiliations

P. K. Biswas1, H. Luetkens1,*, T. Neupert2,3, T. Stürzer4, C. Baines1, G. Pascua1, A. P. Schnyder5, M. H. Fischer6, J. Goryo3,7, M. R. Lees8, H. Maeter9, F. Brückner9, H.-H. Klauss9, M. Nicklas10, P. J. Baker11, A. D. Hillier11, M. Sigrist3, A. Amato1, and D. Johrendt4

  • 1Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
  • 2Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
  • 3Institute for Theoretical Physics, ETH Zurich, 8093 Zurich, Switzerland
  • 4Department Chemie, Ludwig-Maximilians-Universität München, D-81377 München, Germany
  • 5Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 6Department of Physics, Cornell University, Ithaca, New York 14853, USA
  • 7Department of Advanced Physics, Hirosaki University, Hirosaki 036-8561, Japan
  • 8Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom
  • 9Institute for Solid State Physics, TU Dresden, D-01069 Dresden, Germany
  • 10Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
  • 11ISIS Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom

  • *hubertus.luetkens@psi.ch

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 87, Iss. 18 — 1 May 2013

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×