TY - JOUR
T1 - Suppression of superconductivity by Néel-type magnetic fluctuations in the iron pnictides
AU - Fernandes, Rafael M.
AU - Millis, Andrew J.
PY - 2013/3/14
Y1 - 2013/3/14
N2 - Motivated by the recent experimental detection of Néel-type [(π, π)] magnetic fluctuations in some iron pnictides, we study the impact of competing (π, π) and (π, 0) spin fluctuations on the superconductivity of these materials. We show that, counterintuitively, even short-range, weak Néel fluctuations strongly suppress the s+- state, with the main effect arising from a repulsive contribution to the s +- pairing interaction, complemented by low-frequency inelastic scattering. Further increasing the strength of the Néel fluctuations leads to a low-Tc d-wave state, with a possible intermediate s+id phase. The results suggest that the absence of superconductivity in a series of hole-doped pnictides is due to the combination of short-range Néel fluctuations and pair-breaking impurity scattering and also that Tc of optimally doped pnictides could be further increased if residual (π, π) fluctuations were reduced.
AB - Motivated by the recent experimental detection of Néel-type [(π, π)] magnetic fluctuations in some iron pnictides, we study the impact of competing (π, π) and (π, 0) spin fluctuations on the superconductivity of these materials. We show that, counterintuitively, even short-range, weak Néel fluctuations strongly suppress the s+- state, with the main effect arising from a repulsive contribution to the s +- pairing interaction, complemented by low-frequency inelastic scattering. Further increasing the strength of the Néel fluctuations leads to a low-Tc d-wave state, with a possible intermediate s+id phase. The results suggest that the absence of superconductivity in a series of hole-doped pnictides is due to the combination of short-range Néel fluctuations and pair-breaking impurity scattering and also that Tc of optimally doped pnictides could be further increased if residual (π, π) fluctuations were reduced.
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U2 - 10.1103/PhysRevLett.110.117004
DO - 10.1103/PhysRevLett.110.117004
M3 - Article
AN - SCOPUS:84875247736
SN - 0031-9007
VL - 110
JO - Physical review letters
JF - Physical review letters
IS - 11
M1 - 117004
ER -