TY - JOUR
T1 - Theory of non-Fermi liquid and pairing in electron-doped cuprates
AU - Krotkov, Pavel
AU - Chubukov, Andrey V.
PY - 2006
Y1 - 2006
N2 - We apply the spin-fermion model to study the normal state and pairing instability in electron-doped cuprates near the antiferromagnetic quantum-critical point. Peculiar frequency dependencies of the normal state properties are shown to emerge from the self-consistent equations on the fermionic and bosonic self-energies, and are in agreement with experimentally observed ones. We argue that the pairing instability is in the d x2 - y2 channel, as in hole-doped cuprates, but theoretical Tc is much lower than in the hole-doped case. For the same hopping integrals and the interaction strength as in hole-doped materials, we obtain Tc ∼10 K at the end point of the antiferromagnetic phase. We argue that a strong reduction of Tc in electron-doped cuprates compared to hole-doped ones is due to critical role of the Fermi surface curvature for electron-doped materials. The d x2 - y2 -pairing gap Δ(k,ω) is strongly nonmonotonic along the Fermi surface. The position of the gap maxima, however, does not coincide with the hot spots, as the nonmonotonic d x2 - y2 gap persists even at doping when the hot spots merge on the Brillouin zone diagonals.
AB - We apply the spin-fermion model to study the normal state and pairing instability in electron-doped cuprates near the antiferromagnetic quantum-critical point. Peculiar frequency dependencies of the normal state properties are shown to emerge from the self-consistent equations on the fermionic and bosonic self-energies, and are in agreement with experimentally observed ones. We argue that the pairing instability is in the d x2 - y2 channel, as in hole-doped cuprates, but theoretical Tc is much lower than in the hole-doped case. For the same hopping integrals and the interaction strength as in hole-doped materials, we obtain Tc ∼10 K at the end point of the antiferromagnetic phase. We argue that a strong reduction of Tc in electron-doped cuprates compared to hole-doped ones is due to critical role of the Fermi surface curvature for electron-doped materials. The d x2 - y2 -pairing gap Δ(k,ω) is strongly nonmonotonic along the Fermi surface. The position of the gap maxima, however, does not coincide with the hot spots, as the nonmonotonic d x2 - y2 gap persists even at doping when the hot spots merge on the Brillouin zone diagonals.
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U2 - 10.1103/PhysRevB.74.014509
DO - 10.1103/PhysRevB.74.014509
M3 - Article
AN - SCOPUS:33746032557
SN - 1098-0121
VL - 74
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 1
M1 - 014509
ER -