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Trans Tech Publications, Solid State Phenomena, (289), p. 148-155, 2019

DOI: 10.4028/www.scientific.net/ssp.289.148

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<sup>75</sup>As NMR Studies of Magnetic Properties of the Magnetic Superconductor CaK(Fe<sub>0.967</sub>Ni<sub>0.033</sub>)<sub>4</sub>As<sub>4</sub>

Journal article published in 2019 by Qing Ping Ding ORCID, William R. Meier, Anna E. Böhmer, Sergey L. Budk'o, Paul C. Canfield, Yuji Furukawa
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

We have carried out75As nuclear magnetic resonance (NMR) measurements to investigate a new antiferromagnetic (AFM) state, the so-called hedgehog spin-vortex crystal (SVC) in CaK(Fe0.967Ni0.033)4As4. The hedgehog SVC order is clearly demonstrated by the direct observation of internal magnetic induction along the c axis at the As1 site (close to K) and a zero net internal magnetic induction at the As2 site (close to Ca) below an AFM ordering temperature of TN~ 45 K. In the superconducting (SC) state, the NMR signal intensity decreases suddenly just below Tc~ 20 K due to Meissner effect, evidencing the coexistence of the hedgehog SVC AFM and SC states from a microscopic point of view.