On magnetic structure of CuFe2Ge2: Constrains from the 57Fe Mössbauer spectroscopy

Abstract 57 Fe Mossbauer spectroscopy measurements were performed on a powdered CuFe 2 Ge 2 sample that orders antiferromagnetically at ∼ 175  K. Whereas a paramagnetic doublet was observed above the Neel temperature, a superposition of paramagnetic doublet and magnetic sextet (in approximately 0.5:0.5 ratio) was observed in the magnetically ordered state, suggesting a magnetic structure similar to a double- Q spin density wave with half of the Fe paramagnetic and another half bearing static moment of ∼ 0.5 - 1 μ B . These results call for a re-evaluation of the recent neutron scattering data and band structure calculations, as well as for deeper examination of details of sample preparation techniques.