Mössbauer spectroscopy of Fe-doped valence-fluctuating α-YbAlB4
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The magnetic properties of high-quality ∼25 at.% Fe doped α-YbAlB4 with an orthorhombic Pbam structure were investigated by using magnetization measurements and 57Fe Mössbauer spectroscopy. The temperature dependence of the magnetization along the a-axis showed anomalies at T N2 ∼ 7.7 K and T N1 ∼ 10.4 K. Broadenings of the peaks in the Mössbauer spectrum were observed at temperatures below 6 K, which were due to the magnetic hyperfine fields transferred from the Yb magnetic moments. The evaluated transferred magnetic hyperfine field almost disappears around T N2. The anomalous temperature dependence of the transferred magnetic hyperfine field reveals that the magnetic structure and the ordered magnetic moments of the Yb ions show complex temperature dependences at temperatures below T N1.
KeywordsYbAlB4 Valence fluctuation Mössbauer spectroscopy
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