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Local density of states in the superconductor \(\kappa\)-(BEDT-TTF)\(_2\)Cu[N(CN)\(_2\)]Br
Preprint
Sandra Diehl ,
Torsten Methfessel ,
Jens Müller ,
Michael Lang ,
Michael Huth ,
Martin Jourdan ,
Hans-Joachim Elmers
12 November 2014
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Abstract
Low temperature scanning tunneling spectroscopy reveals the local density of states of the organic superconductor \(\kappa\)-(BEDT-TTF)\(_2\)Cu[N(CN)\(_2\)]Br, that was cut in-situ in ultra-high vacuum perpendicular to the superconducting BEDT-TTF layers. The spectra confirm that superconductivity is confined to the conducting BEDT-TTF layers, while the Cu[N(CN)\(_2\)]Br anion layers are insulating. The density of states comprises a twofold superconducting gap, which is attributed to the two separated bands crossing the Fermi surface.