Fully gapped superconductivity in the topological superconductor β−PdBi2
P. K. Biswas, D. G. Mazzone, R. Sibille, E. Pomjakushina, K. Conder, H. Luetkens, C. Baines, J. L. Gavilano, M. Kenzelmann, A. Amato, E. Morenzoni
DOI 10.1103/PhysRevB.93.220504 · Physical Review B
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Abstract
The recent discovery of the topologically protected surface states in the β phase of PdBi2 has reignited the research interest in this class of superconductors. Here, we show results of our muon spin relaxation and rotation (μSR) measurements carried out to investigate the superconducting and magnetic properties and the topological effect in the superconducting ground state of β−PdBi2. Zero-field μSR data reveal that no sizable spontaneous magnetization arises with the onset of superconductivity implying that the time reversal symmetry is preserved in the superconducting state of β−PdBi2. Further, a strong diamagnetic shift of the applied field has been observed in the transverse-field (TF) μSR experiments, indicating that any triplet-pairing channel, if present, does not dominate the superconducting condensate. Using TF-μSR, we estimate that the magnetic penetration depth λ=263(10) nm at zero temperature. The nature of λ(T) provides evidence for the existence of a nodeless single s-wave type isotropic energy gap of 0.78(1) meV at zero temperature. Our results further suggest that the topologically protected surface states have no effect on the bulk of the superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PdBi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.4 | Pressure not reported | onset |
| PdBi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.84 | Pressure not reported | midpoint |
| PdBi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.25 | Pressure not reported | unknown |
| PdBi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.73 | Pressure not reported | unknown |
| PdBi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | Pressure not reported | unknown |
| Pd2.5Bi1.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.7 | Pressure not reported | unknown |
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