6533b7cffe1ef96bd1259a4b
RESEARCH PRODUCT
Evidence for eight node mixed-symmetry superconductivity in a correlated organic metal
Martin JourdanHarald Olaf JeschkeUlrich TutschDaniel GuterdingMichael LangJens MüllerTorsten MethfesselHarald SchubertMichael HuthMichaela AltmeyerRoser ValentíSandra DiehlHans-joachim Elmerssubject
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)description
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)$_2$Cu[N(CN)$_2$]Br with the tunneling direction parallel to the layered structure.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-10-30 |