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 language | English |
|---|---|
| Article number | 216403 |
| Journal | Physical Review Letters |
| Volume | 110 |
| Issue number | 21 |
| DOIs | |
| Publication status | Published - May 21 2013 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Absence of metallicity in K-doped picene : Importance of electronic correlations. / Ruff, Andreas; Sing, Michael; Claessen, Ralph; Lee, Hunpyo; Tomić, Milan; Jeschke, Harald Olaf; Valentí, Roser.
In: Physical Review Letters, Vol. 110, No. 21, 216403, 21.05.2013.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Absence of metallicity in K-doped picene
T2 - Importance of electronic correlations
AU - Ruff, Andreas
AU - Sing, Michael
AU - Claessen, Ralph
AU - Lee, Hunpyo
AU - Tomić, Milan
AU - Jeschke, Harald Olaf
AU - Valentí, Roser
PY - 2013/5/21
Y1 - 2013/5/21
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84878069527&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84878069527&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.110.216403
DO - 10.1103/PhysRevLett.110.216403
M3 - Article
VL - 110
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 21
M1 - 216403
ER -