Evidence of Nodes in the Order Parameter of the Superconducting Doped Topological Insulator NbₓBi₂Se₃ Via Penetration Depth Measurements
The low-temperature variation of the London penetration depth λ(T) in the candidate topological superconductor NbxBi2Se3 (x=0.25) is reported for several crystals. The measurements were carried out by means of a tunnel-diode oscillator technique in both field orientations (Hrf || c and Hrf || ab planes). All samples exhibited power-law behavior at low temperatures (Δλ~T2) clearly indicating the presence of point nodes in the superconducting order parameter. The results presented here are consistent with a nematic odd-parity spin-triplet Eu pairing state in NbxBi2Se3.
M. P. Smylie et al., "Evidence of Nodes in the Order Parameter of the Superconducting Doped Topological Insulator NbₓBi₂Se₃ Via Penetration Depth Measurements," Physical review B: Condensed matter and materials physics, vol. 94, no. 18, American Physical Society (APS), Nov 2016.
The definitive version is available at https://doi.org/10.1103/PhysRevB.94.180510
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01 Nov 2016