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Noncentrosymmetric superconductor with a bulk three-dimensional Dirac cone gapped by strong spin-orbit coupling
Abstract
The layered, noncentrosymmetric heavy element PbTaSe2 is found to be superconducting. We report its electronic properties accompanied by electronic-structure calculations. Specific heat, electrical resistivity, and magnetic-susceptibility measurements indicate that PbTaSe2 is a moderately coupled, type-IIBCSsuperconductor (Tc = 3.72 K, Ginzburg–Landau parameter κ = 17) with an electron-phonon coupling constant of λep = 0.74. Electronic-structure calculations reveal a single bulk three-dimensional Dirac cone at the K point of the Brillouin zone derived exclusively from its hexagonal Pb layer; it is similar to the feature found in graphene except there is a 0.8 eV gap opened by spin-orbit coupling. The combination of large spin-orbit coupling and lack of inversion symmetry also results in large Rashba splitting on the order of tenths of an eV.
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Authors (4)
-
Ali N. Mazhar
- Princeton University Department of Chemistry
-
Gibson D. Quinn
- Princeton University Department of Chemistry
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R. J. Cava
- Princeton University Department of Chemistry
Cite as
Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/PhysRevB.89.020505
- License
- Copyright (2014 American Physical Society)
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
PHYSICAL REVIEW B
no. 89,
edition 2,
pages 1 - 5,
ISSN: 2469-9950 - Language:
- English
- Publication year:
- 2014
- Bibliographic description:
- Mazhar A., Quinn G., Klimczuk T., Cava R.: Noncentrosymmetric superconductor with a bulk three-dimensional Dirac cone gapped by strong spin-orbit coupling// PHYSICAL REVIEW B. -Vol. 89, iss. 2 (2014), s.1-5
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/physrevb.89.020505
- Verified by:
- Gdańsk University of Technology
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