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- W3048533038 abstract "Temperature dependent $^{57}mathrm{Fe}$ Mossbauer spectroscopy and specific heat measurements for $mathrm{CaK}{({mathrm{Fe}}_{1ensuremath{-}x}{mathrm{Ni}}_{x})}_{4}{mathrm{As}}_{4}$ with $x=0$, 0.017, 0.033, and 0.049 are presented. No magnetic hyperfine field (i.e., no static magnetic order) down to 5.5 K was detected for $x=0$ and 0.017 in agreement with the absence of any additional feature below superconducting transition temperature ${T}_{c}$ in the specific heat data. The evolution of magnetic hyperfine field with temperature was studied for $x=0.033$ and 0.049. The long-range magnetic order in these two compounds coexists with superconductivity. The magnetic hyperfine field ${B}_{text{hf}}$ (ordered magnetic moment) below ${T}_{c}$ in $mathrm{CaK}{({mathrm{Fe}}_{0.967}{mathrm{Ni}}_{0.033})}_{4}{mathrm{As}}_{4}$ is continuously suppressed with the developing superconducting order parameter. The ${B}_{text{hf}}(T)$ data for $mathrm{CaK}{({mathrm{Fe}}_{0.967}{mathrm{Ni}}_{0.033})}_{4}{mathrm{As}}_{4}$ and $mathrm{CaK}{({mathrm{Fe}}_{0.951}{mathrm{Ni}}_{0.049})}_{4}{mathrm{As}}_{4}$ can be described reasonably well by Machida's model for coexistence of itinerant spin density wave magnetism and superconductivity [K. Machida, J. Phys. Soc. Jpn. 50, 2195 (1981)]. We demonstrate directly that superconductivity suppresses the spin density wave order parameter if the conditions are right, in agreement with the theoretical analysis." @default.
- W3048533038 created "2020-08-18" @default.
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- W3048533038 date "2019-03-05" @default.
- W3048533038 modified "2023-10-02" @default.
- W3048533038 title "Coexistence of superconductivity and magnetism in CaK(Fe 1-x Ni x ) 4 As 4 as probed by 57 Fe Mössbauer spectroscopy" @default.
- W3048533038 hasPublicationYear "2019" @default.
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