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

Author

M. P. Smylie
Helmut Claus
Ulrich W. Welp
Waikwong Kwok
Y. Qiu
Yew San Hor, Missouri University of Science and TechnologyFollow
Alexey V. Snezhko

Abstract

The low-temperature variation of the London penetration depth λ(T) in the candidate topological superconductor Nb_xBi₂Se₃ (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 (H_rf || c and H_rf || 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 E_u pairing state in Nb_xBi₂Se₃.

Recommended Citation

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

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 (APS), All rights reserved.

Publication Date

01 Nov 2016