Orbital coupling and superconductivity in the iron pnictides

Junhua Zhang; Rastko Sknepnek; Rafael M. Fernandes; Joerg Schmalian

doi:10.1103/PhysRevB.79.220502

Orbital coupling and superconductivity in the iron pnictides

Junhua Zhang, Rastko Sknepnek, Rafael M. Fernandes, Joerg Schmalian

Research output: Contribution to journal › Article › peer-review

66 Citations (Scopus)

Abstract

We demonstrate that strong interorbital interaction is very efficient to achieve superconductivity due to magnetic fluctuations in the iron pnictides. Fermi-surface states that are coupled by the antiferromagnetic wave vector are often of different orbital nature, causing pair-hopping interactions between distinct Fe-3d orbitals to become important. Performing a self-consistent fluctuation exchange calculation below T(c) we determine the superconducting order parameter as function of intra- and interorbital couplings. We find an s(+/-)-pairing state with T(c)similar or equal to 80 K for realistic parameters.

Original language	English
Article number	ARTN 220502
Number of pages	4
Journal	Physical Review B: Condensed matter and materials physics
Volume	79
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.79.220502
Publication status	Published - Jun 2009

Keywords

SYSTEMS
fluctuations
superconducting materials
SCF calculations
antiferromagnetism
iron compounds
surface states
Fermi surface
2-DIMENSIONAL HUBBARD-MODEL

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10.1103/PhysRevB.79.220502

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title = "Orbital coupling and superconductivity in the iron pnictides",

abstract = "We demonstrate that strong interorbital interaction is very efficient to achieve superconductivity due to magnetic fluctuations in the iron pnictides. Fermi-surface states that are coupled by the antiferromagnetic wave vector are often of different orbital nature, causing pair-hopping interactions between distinct Fe-3d orbitals to become important. Performing a self-consistent fluctuation exchange calculation below T(c) we determine the superconducting order parameter as function of intra- and interorbital couplings. We find an s(+/-)-pairing state with T(c)similar or equal to 80 K for realistic parameters.",

keywords = "SYSTEMS, fluctuations, superconducting materials, SCF calculations, antiferromagnetism, iron compounds, surface states, Fermi surface, 2-DIMENSIONAL HUBBARD-MODEL",

author = "Junhua Zhang and Rastko Sknepnek and Fernandes, {Rafael M.} and Joerg Schmalian",

year = "2009",

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doi = "10.1103/PhysRevB.79.220502",

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journal = "Physical Review B: Condensed matter and materials physics",

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T1 - Orbital coupling and superconductivity in the iron pnictides

AU - Zhang, Junhua

AU - Sknepnek, Rastko

AU - Fernandes, Rafael M.

AU - Schmalian, Joerg

PY - 2009/6

Y1 - 2009/6

N2 - We demonstrate that strong interorbital interaction is very efficient to achieve superconductivity due to magnetic fluctuations in the iron pnictides. Fermi-surface states that are coupled by the antiferromagnetic wave vector are often of different orbital nature, causing pair-hopping interactions between distinct Fe-3d orbitals to become important. Performing a self-consistent fluctuation exchange calculation below T(c) we determine the superconducting order parameter as function of intra- and interorbital couplings. We find an s(+/-)-pairing state with T(c)similar or equal to 80 K for realistic parameters.

AB - We demonstrate that strong interorbital interaction is very efficient to achieve superconductivity due to magnetic fluctuations in the iron pnictides. Fermi-surface states that are coupled by the antiferromagnetic wave vector are often of different orbital nature, causing pair-hopping interactions between distinct Fe-3d orbitals to become important. Performing a self-consistent fluctuation exchange calculation below T(c) we determine the superconducting order parameter as function of intra- and interorbital couplings. We find an s(+/-)-pairing state with T(c)similar or equal to 80 K for realistic parameters.

KW - SYSTEMS

KW - fluctuations

KW - superconducting materials

KW - SCF calculations

KW - antiferromagnetism

KW - iron compounds

KW - surface states

KW - Fermi surface

KW - 2-DIMENSIONAL HUBBARD-MODEL

U2 - 10.1103/PhysRevB.79.220502

DO - 10.1103/PhysRevB.79.220502

M3 - Article

SN - 1098-0121

VL - 79

JO - Physical Review B: Condensed matter and materials physics

JF - Physical Review B: Condensed matter and materials physics

IS - 22

M1 - ARTN 220502

ER -

Orbital coupling and superconductivity in the iron pnictides

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Keywords

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