Ferromagnetism and infrared conductivity of the homogeneous hexaboride alloy Eu1-xCaxB6

Jungho Kim, Sunghoon Jung, J. H. Noh, B. K. Cho, E. J. Choi

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We have studied the magnetic and optical properties of hexaboride Eu 1-xCaxB6 for x ≤ 0, 0.13, 0.25, 0.35, 0.54 and 1.0 from measurements of dc magnetization and wide-range absolute reflectivity. The ferromagnetic transition temperature Tc decreases with Ca-doping and is completely suppressed when x exceeds 0.35. The Drude plasma frequency ωp2 also decreases with x and disappears at the same composition. We have analysed this correlation between Tc and ωp2 in terms of the RKKY theory. We have also simulated optical spectra of Eu1-xCaxB 6 using the effective medium theory and compare them with the measured data. The results show that Eu1-xCaxB6 is not a composite of EuB6 and CaB6 but forms a homogeneous magnetic alloy.

Original languageEnglish
Article number106203
JournalJournal of Physics Condensed Matter
Issue number10
StatePublished - 14 Mar 2007


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