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

TY - JOUR

T1 - Collective magnetic excitations of C4 symmetric magnetic states in iron-based superconductors

AU - Scherer, Daniel David

AU - Eremin, Ilya

AU - Andersen, Brian Møller

PY - 2016/11/21

Y1 - 2016/11/21

N2 - 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.

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.

U2 - 10.1103/PhysRevB.94.180405

DO - 10.1103/PhysRevB.94.180405

M3 - Journal article

SN - 2469-9950

VL - 94

JO - Physical Review B

JF - Physical Review B

M1 - 180405

ER -