| Autor: |
Biswas PK; ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire, UK. pabitra.biswas@stfc.ac.uk., Ghosh SK; School of Physical Sciences, University of Kent, Canterbury, UK. S.Ghosh@kent.ac.uk., Zhao JZ; Co-Innovation Center for New Energetic Materials, Southwest University of Science and Technology, Mianyang, China., Mayoh DA; Physics Department, University of Warwick, Coventry, UK., Zhigadlo ND; Laboratory for Solid State Physics, ETH Zurich, Zurich, Switzerland.; CrystMat Company, Zurich, Switzerland., Xu X; Department of Applied Physics, Zhejiang University of Technology, Hangzhou, China., Baines C; Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland., Hillier AD; ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire, UK., Balakrishnan G; Physics Department, University of Warwick, Coventry, UK., Lees MR; Physics Department, University of Warwick, Coventry, UK. |
| Abstrakt: |
Chiral superconductors are novel topological materials with finite angular momentum Cooper pairs circulating around a unique chiral axis, thereby spontaneously breaking time-reversal symmetry. They are rather scarce and usually feature triplet pairing: a canonical example is the chiral p-wave state realized in the A-phase of superfluid He 3 . Chiral triplet superconductors are, however, topologically fragile with the corresponding gapless boundary modes only weakly protected against symmetry-preserving perturbations in contrast to their singlet counterparts. Using muon spin relaxation measurements, here we report that the weakly correlated pnictide compound LaPt 3 P has the two key features of a chiral superconductor: spontaneous magnetic fields inside the superconducting state indicating broken time-reversal symmetry and low temperature linear behaviour in the superfluid density indicating line nodes in the order parameter. Using symmetry analysis, first principles band structure calculation and mean-field theory, we unambiguously establish that the superconducting ground state of LaPt 3 P is a chiral d-wave singlet. |
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