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Dispersion of the superconducting spin resonance in underdoped and antiferromagnetic Ba(Fe1-xCox)2As2

Inelastic neutron scattering measurements have been performed on underdoped Ba(Fe1-xCox)2As2 (x = 4.7%) where superconductivity and long-range antiferromagnetic (AFM) order coexist. The broad magnetic spectrum found in the normal state develops into a magnetic resonance feature below TC that has appreciable dispersion along c-axis with a bandwidth of 3-4 meV. This is in contrast to the optimally doped x = 8.0% composition, with no long-range AFM order, where the resonance exhibits a much weaker dispersion [see Lumsden et al. Phys. Rev. Lett. 102, 107005 (2009)]. The results suggest that the resonance dispersion arises from interlayer spin correlations present in the AFM ordered state.

preprint2010arXivOpen access
D. K. PrattA. KreyssigS. NandiN. NiA. ThalerM. D. LumsdenW. TianJ. L. ZarestkyS. L. Bud'koP. C. CanfieldA. I. GoldmanR. J. McQueeney
cond-mat.supr-concond-mat.str-el
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D. K. PrattA. KreyssigS. NandiN. NiA. ThalerM. D. LumsdenW. TianJ. L. ZarestkyS. L. Bud'koP. C. CanfieldA. I. GoldmanR. J. McQueeney

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