Fluctuation-driven superconductivity in Sr2RuO4 from weak repulsive interactions
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Fluctuation-driven superconductivity in Sr2RuO4 from weak repulsive interactions. / Romer, A. T.; Andersen, B. M.
I: Modern Physics Letters B, Bind 34, Nr. 19-20, 2040052, 20.07.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Fluctuation-driven superconductivity in Sr2RuO4 from weak repulsive interactions
AU - Romer, A. T.
AU - Andersen, B. M.
PY - 2020/7/20
Y1 - 2020/7/20
N2 - We provide results for the leading superconducting instabilities for a model pertaining to Sr2RuO4 obtained within spin-fluctuation mediated superconductivity in the very weak-coupling limit. The theory incorporates spin-orbit coupling (SOC) effects both in the band structure and in the pairing kernel in the form of associated magnetic anisotropies. The leading superconducting phase is found to be d(x2-y2) and a nodal s-wave state. However, the odd-parity helical solution can become leading either for small SOC and Hund's coupling J in the weak U-limit, or in the opposite limit with large SOC and J at larger values of the Hubbard-U. The odd-parity chiral solution is never found to be leading. Finally we discuss the form of the resulting superconducting spectral gaps in the different explored parameter regimes.
AB - We provide results for the leading superconducting instabilities for a model pertaining to Sr2RuO4 obtained within spin-fluctuation mediated superconductivity in the very weak-coupling limit. The theory incorporates spin-orbit coupling (SOC) effects both in the band structure and in the pairing kernel in the form of associated magnetic anisotropies. The leading superconducting phase is found to be d(x2-y2) and a nodal s-wave state. However, the odd-parity helical solution can become leading either for small SOC and Hund's coupling J in the weak U-limit, or in the opposite limit with large SOC and J at larger values of the Hubbard-U. The odd-parity chiral solution is never found to be leading. Finally we discuss the form of the resulting superconducting spectral gaps in the different explored parameter regimes.
KW - Fluctuation-driven superconductivity
KW - Sr2RuO4
KW - spin-orbit coupling
KW - BAND-STRUCTURE
KW - GAP
U2 - 10.1142/S0217984920400527
DO - 10.1142/S0217984920400527
M3 - Journal article
VL - 34
JO - Modern Physics Letters B
JF - Modern Physics Letters B
SN - 0217-9849
IS - 19-20
M1 - 2040052
ER -
ID: 247157628