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 O. Jeschke; Roser Valentí; Martin Jourdan; Hans Joachim Elmers

doi:10.1103/PhysRevLett.116.237001

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 O. Jeschke, Roser Valentí, Martin Jourdan, Hans Joachim Elmers

Research output: Contribution to journal › Article › peer-review

27 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 language	English
Article number	237001
Journal	Physical Review Letters
Volume	116
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevLett.116.237001
Publication status	Published - Jun 7 2016
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.116.237001

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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.",

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AU - Guterding, Daniel

AU - Diehl, Sandra

AU - Altmeyer, Michaela

AU - Methfessel, Torsten

AU - Tutsch, Ulrich

AU - Schubert, Harald

AU - Lang, Michael

AU - Müller, Jens

AU - Huth, Michael

AU - Jeschke, Harald O.

AU - Valentí, Roser

AU - Jourdan, Martin

AU - Elmers, Hans Joachim

PY - 2016/6/7

Y1 - 2016/6/7

N2 - 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.

AB - 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.

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

Abstract

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