Antiferromagnetic order and its interplay with superconductivity in CaK(Fe 1 - X Mnx )4As4

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

Antiferromagnetic order and its interplay with superconductivity in CaK(Fe 1 - X Mn_x)₄As₄

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

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Abstract

The magnetic order for several compositions of CaK(Fe 1-x Mn x )4As4 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 CaKFe4As4 . The hSVC state is characterized by the stripe-type propagation vectors (π0) and (0π) just as in the doped 122 compounds. The hSVC state preserves tetragonal symmetry at the Fe site, and only this SVC motif with simple antiferromagnetic (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, 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 ≈ 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).

Original language	English
Article number	395801
Journal	Journal of Physics Condensed Matter
Volume	35
Issue number	39
DOIs	https://doi.org/10.1088/1361-648X/ace093
State	Published - Oct 2 2023

Funding

We are grateful for Dominic H Ryan for useful discussions. Work at Ames National Laboratory was supported by the U.S. Department of Energy (DOE), Basic Energy Sciences, Division of Materials Sciences & Engineering, under Contract No. DE-AC02-07CH11358. A portion of this research used resources at the High Flux Isotope Reactor, a U.S. DOE Office of Science User Facility operated by Oak Ridge National Laboratory. S L B is indebted to Dr Zoltán Klencsár for his help in modification of MossWinn code.

Funders	Funder number
U.S. Department of Energy
Basic Energy Sciences
Division of Materials Sciences and Engineering	DE-AC02-07CH11358

Keywords

antiferromagnetism
iron-based superconductors
quantum phase transition

Access to Document

10.1088/1361-648X/ace093

Cite this

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title = "Antiferromagnetic order and its interplay with superconductivity in CaK(Fe 1 - X Mnx )4As4",

abstract = "The magnetic order for several compositions of CaK(Fe 1-x Mn x )4As4 has been studied by nuclear magnetic resonance (NMR), M{\"o}ssbauer 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 CaKFe4As4 . The hSVC state is characterized by the stripe-type propagation vectors (π0) and (0π) just as in the doped 122 compounds. The hSVC state preserves tetragonal symmetry at the Fe site, and only this SVC motif with simple antiferromagnetic (AFM) stacking along c is consistent with all our observations using NMR M{\"o}ssbauer spectroscopy, and neutron diffraction. We find that the hSVC state in the Mn-doped 1144 compound coexists with superconductivity, and by combining the neutron scattering and M{\"o}ssbauer 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 ≈ 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).",

keywords = "antiferromagnetism, iron-based superconductors, quantum phase transition",

author = "Wilde, {J. M.} and A. Sapkota and Ding, {Q. P.} and M. Xu and W. Tian and Bud'Ko, {S. L.} and Y. Furukawa and A. Kreyssig and Canfield, {P. C.}",

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T1 - Antiferromagnetic order and its interplay with superconductivity in CaK(Fe 1 - X Mnx )4As4

AU - Wilde, J. M.

AU - Sapkota, A.

AU - Ding, Q. P.

AU - Xu, M.

AU - Tian, W.

AU - Bud'Ko, S. L.

AU - Furukawa, Y.

AU - Kreyssig, A.

AU - Canfield, P. C.

PY - 2023/10/2

Y1 - 2023/10/2

N2 - The magnetic order for several compositions of CaK(Fe 1-x Mn x )4As4 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 CaKFe4As4 . The hSVC state is characterized by the stripe-type propagation vectors (π0) and (0π) just as in the doped 122 compounds. The hSVC state preserves tetragonal symmetry at the Fe site, and only this SVC motif with simple antiferromagnetic (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, 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 ≈ 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).

AB - The magnetic order for several compositions of CaK(Fe 1-x Mn x )4As4 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 CaKFe4As4 . The hSVC state is characterized by the stripe-type propagation vectors (π0) and (0π) just as in the doped 122 compounds. The hSVC state preserves tetragonal symmetry at the Fe site, and only this SVC motif with simple antiferromagnetic (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, 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 ≈ 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).

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