Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs

Abstract

We use neutron scattering to study vanadium (hole)-doped LiFe${}_{1-x}$V${}_x$As. In the undoped state, LiFeAs exhibits superconductivity at $T_c=18$ K and transverse incommensurate spin excitations similar to electron overdoped iron pnictides. Upon vanadium-doping to form LiFe${}_{0.955}$V${}_{0.045}$, the transverse incommensurate spin excitations in LiFeAs transform into longitudinally elongated in a similar fashion as that of potassium (hole) doped Ba${}_{0.7}$K${}_{0.3}$Fe${}_2$As${}_2$, but with dramatically enhanced magnetic scattering and elimination of superconductivity. This is different from the suppression of the overall magnetic excitations in hole doped BaFe${}_2$As${}_2$ and the enhancement of superconductivity near optimal hole doping. These results are consistent with density function theory plus dynamic mean field theory calculations, suggesting that vanadium-doping in LiFeAs may induce an enlarged effective magnetic moment $S_{eff}$ with a spin crossover ground state arising from the inter-orbital scattering of itinerant electrons.

arXiv commentAccepted by npj Quantum Materials

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