Spin-orbit coupling and odd-parity superconductivity in the quasi-one-dimensional compoundLi0.9Mo6O17
| Autor: | Christian Platt, Ronny Thomale, Ross H. McKenzie, Weejee Cho, Srinivas Raghu |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Superconductivity Condensed matter physics Graphene Point reflection Degenerate energy levels Fermi surface 02 engineering and technology Spin–orbit interaction Renormalization group 021001 nanoscience & nanotechnology 01 natural sciences law.invention symbols.namesake law Quantum mechanics 0103 physical sciences symbols 010306 general physics 0210 nano-technology Hamiltonian (quantum mechanics) |
| Zdroj: | Physical Review B. 93 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.93.214515 |
| Popis: | Previous theoretical studies [W. Cho, C. Platt, R. H. McKenzie, and S. Raghu, Phys. Rev. B 92, 134514 (2015)10.1103/PhysRevB.92.134514; N. Lera and J. V. Alvarez, Phys. Rev. B 92, 174523 (2015)10.1103/PhysRevB.92.174523] have suggested that Li0.9Mo6O17, a quasi-one-dimensional "purple bronze" compound, exhibits spin-triplet superconductivity and that the gap function changes sign across the two nearly degenerate Fermi surface sheets. We investigate the role of spin-orbit coupling (SOC) in determining the symmetry and orientation of the d vector associated with the superconducting order parameter. We propose that the lack of local inversion symmetry within the four-atom unit cell leads to a spin-orbit coupling analogous to that proposed for graphene, MoS2, or SrPtAs. In addition, from a weak-coupling renormalization group treatment of an effective model Hamiltonian, we find that SOC favors the odd parity A1u state with Sz=±1 over the B states with Sz=0, where z denotes the least-conducting direction. We discuss possible definitive experimental signatures of this superconducting state. |
| Databáze: | OpenAIRE |
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