Journal
PHYSICAL REVIEW B
Volume 87, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.180503
Keywords
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Funding
- NSF [DMR-0955822, DMR-1120296]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0955822] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [23540437] Funding Source: KAKEN
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We report the magnetic and superconducting properties of locally noncentrosymmetric SrPtAs obtained by muon-spin-rotation/relaxation (mu SR) measurements. Zero-field mu SR 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 mu SR 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.
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