Antiferromagnetic order and its interplay with superconductivity in CaK(Fe$$_{1-x}$$Mn$$_x$$)4As4
- Ames Laboratory, and Iowa State University, Ames, IA (United States)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Ames Laboratory, and Iowa State University, Ames, IA (United States); Ruhr Universität, Bochum (Germany)
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 $$(\pi\,0)$$ and $$(0\,\pi)$$ 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 (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 $$x$$ ≈ 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 ($$T_c$$).
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC05-00OR22725; AC02-07CH11358
- OSTI ID:
- 2251607
- Alternate ID(s):
- OSTI ID: 1992678
- Report Number(s):
- IS-J-11,095
- Journal Information:
- Journal of Physics. Condensed Matter, Vol. 35, Issue 39; ISSN 0953-8984
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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