Absence of Metallicity in K-doped Picene: Importance of Electronic Correlations

Andreas Ruff, Michael Sing, Ralph Claessen, Hunpyo Lee, Milan Tomić, Harald O. Jeschke, and Roser Valentí
Phys. Rev. Lett. 110, 216403 – Published 21 May 2013
PDFHTMLExport Citation

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 (x1), 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.

  • Received 15 October 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.216403

© 2013 American Physical Society

Authors & Affiliations

Andreas Ruff, Michael Sing, and Ralph Claessen

  • Physikalisches Institut, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

Hunpyo Lee, Milan Tomić, Harald O. Jeschke, and Roser Valentí

  • Institut für Theoretische Physik, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 110, Iss. 21 — 24 May 2013

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×