Antiferromagnetic order and its interplay with superconductivity in CaK(Fe$_{1-x}$Mn$_x$)$_4$As$_4$

J. M. Wilde; A. Sapkota; Q. -P. Ding; M. Xu; W. Tian; S. L. Bud'ko; Y. Furukawa; A. Kreyssig; P. C. Canfield

doi:10.1088/1361-648X/ace093

paper

Antiferromagnetic order and its interplay with superconductivity in CaK(Fe $_{1 - x}$ Mn $_{x}$ ) $_{4}$ As $_{4}$

arXiv:2301.06336 · doi:10.1088/1361-648X/ace093

Abstract

The magnetic order for several compositions of CaK(Fe $_{1 - x}$ Mn $_{x}$ ) $_{4}$ As $_{4}$ has been studied by nuclear magnetic resonance (NMR), Mössbauer spectroscopy, and neutron diffraction. Our observations for the Mn-doped 1144 compound are consistent with the hedgehog spin vortex crystal (hSVC) order which has previously been found for Ni-doped $Ca K Fe_{4} As_{4}$ . The hSVC state is characterized by the stripe-type propagation vectors $(π 0)$ and $(0 π)$ just as in the doped 122 compounds. The hSVC state preserves tetragonal symmetry at the Fe site, and only this SVC motif with simple AFM stacking along $c$ is consistent with all our observations using NMR, Mössbauer spectroscopy, and neutron diffraction. We find that the hSVC state in the Mn-doped 1144 compound coexists with superconductivity (SC), and by combining the neutron scattering and Mössbauer spectroscopy data we can infer a quantum phase transition, hidden under the superconducting dome, associated with the suppression of the AFM transition temperature ( $T_{N}$ ) to zero for $x \approx 0.01$ . In addition, unlike several 122 compounds and Ni-doped 1144, the ordered magnetic moment is not observed to decrease at temperatures below the superconducting transition temperature ( $T_{c}$ ).

10 pages and 10 figures

Antiferromagnetic order and its interplay with superconductivity in CaK(Fe1−x​Mnx​)4​As4​

Abstract

References in corpus (11)

Antiferromagnetic order and its interplay with superconductivity in CaK(Fe $_{1 - x}$ Mn $_{x}$ ) $_{4}$ As $_{4}$