Impurity states and cooperative magnetic order in Fe-based superconductors

Maria Navarro Gastiasoro; P.J. Hirschfeld; Brian Møller Andersen

doi:10.1103/PhysRevB.88.220509

Impurity states and cooperative magnetic order in Fe-based superconductors

Maria Navarro Gastiasoro, P.J. Hirschfeld, Brian Møller Andersen

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28 Citationer (Scopus)

Abstract

We study impurity bound states and impurity-induced order in the superconducting state of LiFeAs within a realistic five-band model based on the band structure and impurity potentials obtained from density functional theory. In agreement with recent experiments, we find that Co impurities are too weak to produce subgap bound states, whereas stronger impurities like Cu do. We also obtain the bound-state spectrum for magnetic impurities, such as Mn, and show how spin-resolved tunneling may determine the nature of the various defect sites in iron pnictides, a prerequisite for using impurity bound states as a probe of the ground-state pairing symmetry. Lastly, we show how impurities pin both orbital and magnetic order, providing an explanation for a growing set of experimental evidence for unusual magnetic phases in doped iron pnictides.

Originalsprog	Engelsk
Artikelnummer	220509
Tidsskrift	Physical Review B
Vol/bind	88
Udgave nummer	22
ISSN	2469-9950
DOI	https://doi.org/10.1103/PhysRevB.88.220509
Status	Udgivet - 23 jan. 2013

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10.1103/PhysRevB.88.220509

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title = "Impurity states and cooperative magnetic order in Fe-based superconductors",

abstract = "We study impurity bound states and impurity-induced order in the superconducting state of LiFeAs within a realistic five-band model based on the band structure and impurity potentials obtained from density functional theory. In agreement with recent experiments, we find that Co impurities are too weak to produce subgap bound states, whereas stronger impurities like Cu do. We also obtain the bound-state spectrum for magnetic impurities, such as Mn, and show how spin-resolved tunneling may determine the nature of the various defect sites in iron pnictides, a prerequisite for using impurity bound states as a probe of the ground-state pairing symmetry. Lastly, we show how impurities pin both orbital and magnetic order, providing an explanation for a growing set of experimental evidence for unusual magnetic phases in doped iron pnictides.",

author = "{Navarro Gastiasoro}, Maria and P.J. Hirschfeld and Andersen, {Brian M{\o}ller}",

year = "2013",

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doi = "10.1103/PhysRevB.88.220509",

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T1 - Impurity states and cooperative magnetic order in Fe-based superconductors

AU - Navarro Gastiasoro, Maria

AU - Hirschfeld, P.J.

AU - Andersen, Brian Møller

PY - 2013/1/23

Y1 - 2013/1/23

N2 - We study impurity bound states and impurity-induced order in the superconducting state of LiFeAs within a realistic five-band model based on the band structure and impurity potentials obtained from density functional theory. In agreement with recent experiments, we find that Co impurities are too weak to produce subgap bound states, whereas stronger impurities like Cu do. We also obtain the bound-state spectrum for magnetic impurities, such as Mn, and show how spin-resolved tunneling may determine the nature of the various defect sites in iron pnictides, a prerequisite for using impurity bound states as a probe of the ground-state pairing symmetry. Lastly, we show how impurities pin both orbital and magnetic order, providing an explanation for a growing set of experimental evidence for unusual magnetic phases in doped iron pnictides.

AB - We study impurity bound states and impurity-induced order in the superconducting state of LiFeAs within a realistic five-band model based on the band structure and impurity potentials obtained from density functional theory. In agreement with recent experiments, we find that Co impurities are too weak to produce subgap bound states, whereas stronger impurities like Cu do. We also obtain the bound-state spectrum for magnetic impurities, such as Mn, and show how spin-resolved tunneling may determine the nature of the various defect sites in iron pnictides, a prerequisite for using impurity bound states as a probe of the ground-state pairing symmetry. Lastly, we show how impurities pin both orbital and magnetic order, providing an explanation for a growing set of experimental evidence for unusual magnetic phases in doped iron pnictides.

U2 - 10.1103/PhysRevB.88.220509

DO - 10.1103/PhysRevB.88.220509

M3 - Journal article

SN - 2469-9950

VL - 88

JO - Physical Review B

JF - Physical Review B

IS - 22

M1 - 220509

ER -

Impurity states and cooperative magnetic order in Fe-based superconductors

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