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arxiv: 1410.5245 · v1 · pith:DLLQURWXnew · submitted 2014-10-20 · ❄️ cond-mat.str-el · cond-mat.supr-con

Disorder-induced gap in the normal density of states of the organic superconductor kappa-(BEDT-TTF)₂Cu[N(CN)₂]Br

classification ❄️ cond-mat.str-el cond-mat.supr-con
keywords densitystatesbedt-ttfdisorderkappamathrmorganicsuperconductor
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The density of states of the organic superconductor $\kappa$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Br, measured by scanning tunneling spectroscopy on \textit{in-situ} cleaved surfaces, reveals a logarithmic suppression near the Fermi edge persisting above the critical temperature $T_\mathrm{c}$. A soft Hubbard gap as predicted by the Anderson-Hubbard model for systems with disorder exactly describes the experimentally observed suppression. The electronic disorder also explains the diminished coherence peaks of the quasiparticle density of states below $T_\mathrm{c}$.

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