Spin-wave excitations in the spin-density wave state of doped iron pnictides. (4th September 2017)

• Record Type: Journal Article
• Authors: Singh, Dheeraj Kumar
• Is Part Of: Journal of physics. Volume 29:Number 41(2017)
• Publication Date: 2017-09-04
• Subjects: five-orbital model -- spin-wave excitations -- doped iron pnictides; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aa7e13
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We investigate spin-wave excitations in the spin-density wave state of doped iron pnictides within a five-orbital model. We find that the excitations along ( π, 0 ) → ( π, π ) are very sensitive to dopings whereas they do not exhibit a similar sensitivity along ( 0, 0 ) → ( π, 0 ). Secondly, the ellipticity of the elliptical ring-like excitations around ( π, 0 ) is also very much dependent on doping. Thirdly, the spin-wave spectral weight shifts towards the low-energy region as it moves away from zero doping. We find several features to be in qualitative agreement with the inelastic neutron-scattering measurements for the doped pnictides.