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In-plane magnetic field effect on the neutron spin resonance in optimally doped FeSe$_{0.4}$Te$_{0.6}$ and BaFe$_{1.9}$Ni$_{0.1}$As$_{2}$ superconductors

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arxiv 1105.4923 v2 pith:22BZ7JIK submitted 2011-05-25 cond-mat.supr-con

Shiliang Li , Xingye Lu , Meng Wang , Hui-qian Luo , Miaoyin Wang , Chenglin Zhang , Enrico Faulhaber , Louis-Pierre Regnault
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Deepak Singh Pengcheng Dai
This is my paper · ORCID
classification cond-mat.supr-con
keywords resonancemagneticfieldbafedopedeffectfesein-plane
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abstract

We use inelastic neutron scattering to study the effect of an in-plane magnetic field on the magnetic resonance in optimally doped superconductors FeSe$_{0.4}$Te$_{0.6}$ ($T_c=14$ K) and BaFe$_{1.9}$Ni$_{0.1}$As$_{2}$ ($T_c=20$ K). While the magnetic field up to 14.5 Tesla does not change the energy of the resonance, it particially suppresses $T_c$ and the corresponding superconductivity-induced intensity gain of the mode. However, we find no direct evidence for the field-induced spin-1 Zeeman splitting of the resonance. Therefore, it is still unclear if the resonance is the long-sought singlet-triplet excitation directly coupled to the superconducting electron Cooper pairs.

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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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