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Universality of dispersive spin-resonance mode in superconducting BaFe2As2

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arxiv 1309.4197 v1 pith:O34MLBA5 submitted 2013-09-17 cond-mat.supr-con

C. H. Lee , P. Steffens , N. Qureshi , M. Nakajima , K. Kihou , A. Iyo , H. Eisaki , M. Braden This is my paper · ORCID
classification cond-mat.supr-con
keywords superconductingbafe2as2spindispersivefluctuationsobservedphasethree-dimensional
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Spin fluctuations in superconducting BaFe2(As1-xPx)2 (x=0.34, Tc = 29.5 K) are studied using inelastic neutron scattering. Well-defined commensurate magnetic signals are observed at ({\pi},0), which is consistent with the nesting vector of the Fermi surface. Antiferromagnetic (AFM) spin fluctuations in the normal state exhibit a three-dimensional character reminiscent of the AFM order in nondoped BaFe2As2. A clear spin gap is observed in the superconducting phase forming a peak whose energy is significantly dispersed along the c-axis. The bandwidth of dispersion becomes larger with approaching the AFM ordered phase universally in all superconducting BaFe2As2, indicating that the dispersive feature is attributed to three-dimensional AFM correlations. The results suggest a strong relationship between the magnetism and superconductivity.

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  1. Preformed Cooper Pairs in a Triclinic Iron Pnictide Superconductor

    cond-mat.supr-con 2025-01 conditional novelty 6.0 of 10

    In a triclinic iron pnictide superconductor, a spin resonance precursor, Nernst signal, and NMR density-of-states reduction all point to preformed Cooper pairs persisting to T* = 45 K, above Tc = 30 K.

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