Disorder-induced gap in the normal density of states of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br. (15th June 2015)

• Record Type: Journal Article
• Authors: Diehl, Sandra; Methfessel, Torsten; Tutsch, Ulrich; Müller, Jens; Lang, Michael; Huth, Michael; Jourdan, Martin; Elmers, Hans-Joachim
• Is Part Of: Journal of physics. Volume 27:Number 26(2015)
• Publication Date: 2015-06-15
• Subjects: strong electronic correlations -- organic superconductor -- metal-insulator transition -- electronic structure -- scanning tunneling spectroscopy; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/27/26/265601
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: The local density of states (DOS) of the organic superconductor -(BEDT-TTF)2 Cu[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 . 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 .