Title

Evidence of Nodes in the Order Parameter of the Superconducting Doped Topological Insulator NbxBi2Se3 Via Penetration Depth Measurements

Abstract

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.

Department(s)

Physics

International Standard Serial Number (ISSN)

1098-0121

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2016 American Physical Society, All rights reserved.

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