Spin excitations in optimally P-dopedᅠBaFe2(As0.7P0.3)2 superconductor

Abstract

We use inelastic neutron scattering to study the temperature and energy dependence of spin excitations in an optimally P-doped BaFe2(As0.7P0.3)2 superconductor (Tc=30 K) throughout the Brillouin zone. In the undoped state, spin waves and paramagnetic spin excitations of BaFe2As2stem from an antiferromagnetic (AF) ordering wave vector QAF=(±1,0), and peak near the zone boundary at (±1,±1) around 180 meV. Replacing 30% As by smaller P to induce superconductivity, low-energy spin excitations of BaFe2(As0.7P0.3)2 form a resonance in the superconducting state and high-energy spin excitations now peak around 220 meV near (±1,±1). These results are consistent with calculations from a combined density functional theory and dynamical mean field theory, and suggest that the decreased average pnictogen height in BaFe2(As0.7P0.3)2 reduces the strength of electron correlations and increases the effective bandwidth of magnetic excitations.

Description
Advisor
Degree
Type
Journal article
Keywords
Citation

Hu, Ding, Yin, Zhiping, Zhang, Wenliang, et al.. "Spin excitations in optimally P-dopedᅠBaFe2(As0.7P0.3)2 superconductor." Physical Review B, 94, no. 9 (2016) American Physical Society: http://dx.doi.org/10.1103/PhysRevB.94.094504.

Has part(s)
Forms part of
Rights
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Link to license
Citable link to this page