Evidence for Eight-Node Mixed-Symmetry Superconductivity in a Correlated Organic Metal

Daniel Guterding, Sandra Diehl, Michaela Altmeyer, Torsten Methfessel, Ulrich Tutsch, Harald Schubert, Michael Lang, Jens Müller, Michael Huth, Harald Olaf Jeschke, Roser Valentí, Martin Jourdan, Hans Joachim Elmers

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21 Citations (Scopus)

Abstract

We report on a combined theoretical and experimental investigation of the superconducting state in the quasi-two-dimensional organic superconductor κ-(ET)2Cu[N(CN)2]Br. Applying spin-fluctuation theory to a low-energy, material-specific Hamiltonian derived from ab initio density functional theory we calculate the quasiparticle density of states in the superconducting state. We find a distinct three-peak structure that results from a strongly anisotropic mixed-symmetry superconducting gap with eight nodes and twofold rotational symmetry. This theoretical prediction is supported by low-temperature scanning tunneling spectroscopy on in situ cleaved single crystals of κ-(ET)2Cu[N(CN)2]Br with the tunneling direction parallel to the layered structure.

Original languageEnglish
Article number237001
JournalPhysical Review Letters
Volume116
Issue number23
DOIs
Publication statusPublished - Jun 7 2016
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Guterding, D., Diehl, S., Altmeyer, M., Methfessel, T., Tutsch, U., Schubert, H., Lang, M., Müller, J., Huth, M., Jeschke, H. O., Valentí, R., Jourdan, M., & Elmers, H. J. (2016). Evidence for Eight-Node Mixed-Symmetry Superconductivity in a Correlated Organic Metal. Physical Review Letters, 116(23), [237001]. https://doi.org/10.1103/PhysRevLett.116.237001