Abstract
We theoretically study the competition among different electronic phases in molecular conductors κ-(BEDT-TTF)2X. The ground-state properties of a 3/4-filled extended Hubbard model with the κ-type geometry are investigated by a variational Monte Carlo method. We find various competing phases: dimer-Mott insulator, polar charge-ordered insulator, 3-fold charge-ordered metal, and superconductivity, whose pairing symmetry is an "extended-s + dx2 - y2"- wave type. Our results show that the superconducting phase is stabilized not on the verge of the Mott metal-insulator transition but near charge order instabilities, clearly indicating the importance of the intradimer charge degree of freedom and the intermolecular Coulomb interactions, beyond the simple description of the half-filled Hubbard model.
| Original language | English |
|---|---|
| Article number | 033703 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 86 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2017 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Phase competition and superconductivity in κ-(BEDT-TTF)2X : Importance of intermolecular Coulomb interactions. / Watanabe, Hiroshi; Seo, Hitoshi; Yunoki, Seiji.
In: Journal of the Physical Society of Japan, Vol. 86, No. 3, 033703, 2017.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Phase competition and superconductivity in κ-(BEDT-TTF)2X
T2 - Importance of intermolecular Coulomb interactions
AU - Watanabe, Hiroshi
AU - Seo, Hitoshi
AU - Yunoki, Seiji
PY - 2017
Y1 - 2017
N2 - We theoretically study the competition among different electronic phases in molecular conductors κ-(BEDT-TTF)2X. The ground-state properties of a 3/4-filled extended Hubbard model with the κ-type geometry are investigated by a variational Monte Carlo method. We find various competing phases: dimer-Mott insulator, polar charge-ordered insulator, 3-fold charge-ordered metal, and superconductivity, whose pairing symmetry is an "extended-s + dx2 - y2"- wave type. Our results show that the superconducting phase is stabilized not on the verge of the Mott metal-insulator transition but near charge order instabilities, clearly indicating the importance of the intradimer charge degree of freedom and the intermolecular Coulomb interactions, beyond the simple description of the half-filled Hubbard model.
AB - We theoretically study the competition among different electronic phases in molecular conductors κ-(BEDT-TTF)2X. The ground-state properties of a 3/4-filled extended Hubbard model with the κ-type geometry are investigated by a variational Monte Carlo method. We find various competing phases: dimer-Mott insulator, polar charge-ordered insulator, 3-fold charge-ordered metal, and superconductivity, whose pairing symmetry is an "extended-s + dx2 - y2"- wave type. Our results show that the superconducting phase is stabilized not on the verge of the Mott metal-insulator transition but near charge order instabilities, clearly indicating the importance of the intradimer charge degree of freedom and the intermolecular Coulomb interactions, beyond the simple description of the half-filled Hubbard model.
UR - http://www.scopus.com/inward/record.url?scp=85014701840&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85014701840&partnerID=8YFLogxK
U2 - 10.7566/JPSJ.86.033703
DO - 10.7566/JPSJ.86.033703
M3 - Article
VL - 86
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 3
M1 - 033703
ER -