0000000000086429

AUTHOR

Jens Müller

showing 2 related works from this author

Evidence for eight node mixed-symmetry superconductivity in a correlated organic metal

2015

We report a combined theoretical and experimental investigation of the superconducting state in the quasi-two-dimensional organic superconductor $\kappa$-(ET)$_2$Cu[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 $\kappa$-(ET)$_2$…

SuperconductivityPhysicsStrongly Correlated Electrons (cond-mat.str-el)Condensed matter physicsCondensed Matter - SuperconductivityScanning tunneling spectroscopyAb initioFOS: Physical sciencesGeneral Physics and Astronomy02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesSuperconductivity (cond-mat.supr-con)symbols.namesakeCondensed Matter - Strongly Correlated ElectronsCondensed Matter::Superconductivity0103 physical sciencessymbolsOrganic superconductorQuasiparticleDensity of statesDensity functional theory010306 general physics0210 nano-technologyHamiltonian (quantum mechanics)
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Disorder-induced gap in the normal density of states of the organic superconductorκ-(BEDT-TTF)2Cu[N(CN)2]Br

2015

The local density of states (DOS) of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br, measured by scanning tunneling spectroscopy on in situ cleaved surfaces, reveals a logarithmic suppression near the Fermi edge persisting above the critical temperature T(c). The experimentally observed suppression of the DOS is in excellent agreement with a soft Hubbard gap as predicted by the Anderson-Hubbard model for systems with disorder. The electronic disorder also explains the diminished coherence peaks of the quasi-particle DOS below T(c).

Local density of statesMaterials scienceCondensed matter physicsCondensed Matter::SuperconductivityScanning tunneling spectroscopyOrganic superconductorCondensed Matter::Strongly Correlated ElectronsGeneral Materials ScienceCondensed Matter PhysicsNormal densityJournal of Physics: Condensed Matter
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