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

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

doi:10.1088/0953-8984/19/10/106203

Ferromagnetism and infrared conductivity of the homogeneous hexaboride alloy Eu_1-xCa_xB₆

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

Department of Physics

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Abstract

We have studied the magnetic and optical properties of hexaboride Eu _1-xCa_xB₆ 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 T_c decreases with Ca-doping and is completely suppressed when x exceeds 0.35. The Drude plasma frequency ω_p² also decreases with x and disappears at the same composition. We have analysed this correlation between T_c and ω_p² in terms of the RKKY theory. We have also simulated optical spectra of Eu_1-xCa_xB ₆ using the effective medium theory and compare them with the measured data. The results show that Eu_1-xCa_xB₆ is not a composite of EuB₆ and CaB₆ but forms a homogeneous magnetic alloy.

Original language	English
Article number	106203
Journal	Journal of Physics Condensed Matter
Volume	19
Issue number	10
DOIs	https://doi.org/10.1088/0953-8984/19/10/106203
State	Published - 14 Mar 2007

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title = "Ferromagnetism and infrared conductivity of the homogeneous hexaboride alloy Eu1-xCaxB6",

abstract = "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.",

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T1 - Ferromagnetism and infrared conductivity of the homogeneous hexaboride alloy Eu1-xCaxB6

AU - Kim, Jungho

AU - Jung, Sunghoon

AU - Noh, J. H.

AU - Cho, B. K.

AU - Choi, E. J.

PY - 2007/3/14

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N2 - 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.

AB - 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.

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Ferromagnetism and infrared conductivity of the homogeneous hexaboride alloy Eu_1-xCa_xB₆

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