Spin Waves in Detwinned BaFe_{2}As_{2}

Physical Review Letters
Xingye LuPengcheng Dai

Abstract

Understanding magnetic interactions in the parent compounds of high-temperature superconductors forms the basis for determining their role for the mechanism of superconductivity. For parent compounds of iron pnictide superconductors such as AFe_{2}As_{2} (A=Ba, Ca, Sr), although spin excitations have been mapped out throughout the entire Brillouin zone, the respective measurements were carried out on twinned samples and did not allow for a conclusive determination of the spin dynamics. Here we use inelastic neutron scattering to completely map out spin excitations of ∼100% detwinned BaFe_{2}As_{2}. By comparing observed spectra with theoretical calculations, we conclude that the spin excitations can be well described by an itinerant model when taking into account moderate electronic correlation effects.

References

Jun 1, 2001·Physical Review Letters·R ColdeaZ Fisk
Jun 13, 2009·Physical Review Letters·S O DialloR J McQueeney
Apr 3, 2012·Physical Review Letters·Chetan DhitalStephen D Wilson
Aug 11, 2012·Science·Jiun-Haw ChuIan R Fisher
May 20, 2014·Physical Review Letters·Luca de' MediciMassimo Capone

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Citations

May 22, 2019·Nature Materials·Tong ChenPengcheng Dai

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