Collective magnetic excitations of C4 symmetric magnetic states in iron-based superconductors

Daniel David Scherer; Ilya Eremin; Brian Møller Andersen

doi:10.1103/PhysRevB.94.180405

Collective magnetic excitations of C₄ symmetric magnetic states in iron-based superconductors

Daniel David Scherer, Ilya Eremin, Brian Møller Andersen

X-ray and Neutron Science

14 Citationer (Scopus)

Abstract

We study the collective magnetic excitations of the recently discovered C4-symmetric spin-density-wave states of iron-based superconductors with particular emphasis on their orbital character based on an itinerant multiorbital approach. This is important since the C4-symmetric spin-density-wave states exist only at moderate interaction strengths where damping effects from a coupling to the continuum of particle-hole excitations strongly modify the shape of the excitation spectra compared to predictions based on a local moment picture. We uncover a distinct orbital polarization inherent to magnetic excitations in C4-symmetric states, which provide a route to identify the different commensurate magnetic states appearing in the continuously updated phase diagram of the iron-pnictide family.

Originalsprog	Engelsk
Artikelnummer	180405
Tidsskrift	Physical Review B
Vol/bind	94
ISSN	2469-9950
DOI	https://doi.org/10.1103/PhysRevB.94.180405
Status	Udgivet - 21 nov. 2016

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10.1103/PhysRevB.94.180405

PhysRevB.94.180405Forlagets udgivne version, 973 KB

Citationsformater

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abstract = "We study the collective magnetic excitations of the recently discovered C4-symmetric spin-density-wave states of iron-based superconductors with particular emphasis on their orbital character based on an itinerant multiorbital approach. This is important since the C4-symmetric spin-density-wave states exist only at moderate interaction strengths where damping effects from a coupling to the continuum of particle-hole excitations strongly modify the shape of the excitation spectra compared to predictions based on a local moment picture. We uncover a distinct orbital polarization inherent to magnetic excitations in C4-symmetric states, which provide a route to identify the different commensurate magnetic states appearing in the continuously updated phase diagram of the iron-pnictide family.",

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AB - We study the collective magnetic excitations of the recently discovered C4-symmetric spin-density-wave states of iron-based superconductors with particular emphasis on their orbital character based on an itinerant multiorbital approach. This is important since the C4-symmetric spin-density-wave states exist only at moderate interaction strengths where damping effects from a coupling to the continuum of particle-hole excitations strongly modify the shape of the excitation spectra compared to predictions based on a local moment picture. We uncover a distinct orbital polarization inherent to magnetic excitations in C4-symmetric states, which provide a route to identify the different commensurate magnetic states appearing in the continuously updated phase diagram of the iron-pnictide family.

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Collective magnetic excitations of C4 symmetric magnetic states in iron-based superconductors

Abstract

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Collective magnetic excitations of C₄ symmetric magnetic states in iron-based superconductors