Absence of metallicity in K-doped picene: Importance of electronic correlations

Andreas Ruff, Michael Sing, Ralph Claessen, Hunpyo Lee, Milan Tomić, Harald Olaf Jeschke, Roser Valentí

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Abstract

Potassium-doped picene (Kxpicene) has recently been reported to be a superconductor at x=3 with critical temperatures up to 18 K. Here we study the electronic structure of K-doped picene films by photoelectron spectroscopy and ab initio density functional theory combined with dynamical mean-field theory (DFT+DMFT). Experimentally we observe that, except for spurious spectral weight due to the lack of a homogeneous chemical potential at low K concentrations (x≈1), the spectra always display a finite energy gap. This result is supported by our DFT+DMFT calculations which provide clear evidence that Kxpicene is a Mott insulator for integer doping concentrations x=1, 2, and 3. We discuss various scenarios to understand the discrepancies with previous reports of superconductivity and metallic behavior.

Original languageEnglish
Article number216403
JournalPhysical Review Letters
Volume110
Issue number21
DOIs
Publication statusPublished - May 21 2013
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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