Abstract
We have performed detailed ${}^{57}$Fe M\ossbauer spectroscopy measurements on Ba${}_{0.75}$K${}_{0.25}$Fe${}_{2}$As${}_{2}$ single-crystal mosaics showing antiferromagnetic ordering below ${T}_{N}$ $=$ 95 K with superconductivity below ${T}_{C}$ around 30 K. Analysis of the M\ossbauer spectra shows a decrease in the magnetic hyperfine field but no change in the magnetic volume fraction below ${T}_{C}$. This indicates coexistence of magnetism and superconductivity in these compounds.
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