Relation between nodes and 2Δ/Tc on the hole Fermi surface in iron-based superconductors

Saurabh Maiti; Andrey V. Chubukov

doi:10.1103/PhysRevB.83.220508

Relation between nodes and 2Δ/T_c on the hole Fermi surface in iron-based superconductors

Saurabh Maiti, Andrey V. Chubukov

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Abstract

We analyze the interplay between the absence or presence of nodes in the superconducting gap along electron Fermi surfaces (FSs) in Fe pnictides and 2Δ/T_c along hole FSs (2Δ_h/T_c), measured by angle-resolved photoemission spectroscopy (ARPES). We solve the set of coupled gap equations for 4- and 5-pocket models of Fe pnictides and relate the presence of the nodes to 2Δ_h/T_c being below a certain threshold. Using ARPES data for 2Δ_h/T_c, we find that the optimally doped Ba_1-xK_xFe₂As ₂ and Ba(Fe_1-xCo_x)₂As₂ are likely nodeless, but isovalent BaFe₂(As_1-xP _x)₂ likely has nodes.

Original language	English (US)
Article number	220508
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	83
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.83.220508
State	Published - Jun 16 2011
Externally published	Yes

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title = "Relation between nodes and 2Δ/Tc on the hole Fermi surface in iron-based superconductors",

abstract = "We analyze the interplay between the absence or presence of nodes in the superconducting gap along electron Fermi surfaces (FSs) in Fe pnictides and 2Δ/Tc along hole FSs (2Δh/Tc), measured by angle-resolved photoemission spectroscopy (ARPES). We solve the set of coupled gap equations for 4- and 5-pocket models of Fe pnictides and relate the presence of the nodes to 2Δh/Tc being below a certain threshold. Using ARPES data for 2Δh/Tc, we find that the optimally doped Ba1-xKxFe2As 2 and Ba(Fe1-xCox)2As2 are likely nodeless, but isovalent BaFe2(As1-xP x)2 likely has nodes.",

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AU - Maiti, Saurabh

AU - Chubukov, Andrey V.

PY - 2011/6/16

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N2 - We analyze the interplay between the absence or presence of nodes in the superconducting gap along electron Fermi surfaces (FSs) in Fe pnictides and 2Δ/Tc along hole FSs (2Δh/Tc), measured by angle-resolved photoemission spectroscopy (ARPES). We solve the set of coupled gap equations for 4- and 5-pocket models of Fe pnictides and relate the presence of the nodes to 2Δh/Tc being below a certain threshold. Using ARPES data for 2Δh/Tc, we find that the optimally doped Ba1-xKxFe2As 2 and Ba(Fe1-xCox)2As2 are likely nodeless, but isovalent BaFe2(As1-xP x)2 likely has nodes.

AB - We analyze the interplay between the absence or presence of nodes in the superconducting gap along electron Fermi surfaces (FSs) in Fe pnictides and 2Δ/Tc along hole FSs (2Δh/Tc), measured by angle-resolved photoemission spectroscopy (ARPES). We solve the set of coupled gap equations for 4- and 5-pocket models of Fe pnictides and relate the presence of the nodes to 2Δh/Tc being below a certain threshold. Using ARPES data for 2Δh/Tc, we find that the optimally doped Ba1-xKxFe2As 2 and Ba(Fe1-xCox)2As2 are likely nodeless, but isovalent BaFe2(As1-xP x)2 likely has nodes.

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Relation between nodes and 2Δ/T_c on the hole Fermi surface in iron-based superconductors

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