Evidence of nodes in the order parameter of the superconducting doped topological insulator ${\mathrm{Nb}}_x{\mathrm{Bi}}_2{\mathrm{Se}}_3$ via penetration depth measurements

Journal Article · Tue Nov 01 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.180510· OSTI ID:1356638

Smylie, M. P.; Claus, H.; Welp, U.; Kwok, W. -K.; Qiu, Y.; Hor, Y. S.; Snezhko, A.

The low-temperature variation of the London penetration depth lambda(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 (H-rf || c and H-rf || ab planes). All samples exhibited power-law behavior at low temperatures (Delta lambda similar to T-2) 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 NbxBi2Se3.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1356638
• Journal Information: Physical Review B, Vol. 94, Issue 18; ISSN 2469-9950
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

Superconductivity
Topological superconductivity