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- W2495276601 abstract "The local environment of ${mathrm{Gd}}^{3+}$ ${(4f}^{7}, S=7/2)$ ions in single crystals of ${mathrm{Ca}}_{1ensuremath{-}x}{mathrm{Gd}}_{x}{mathrm{B}}_{6}$ $(0.0001ensuremath{lesssim}xensuremath{lesssim}0.01)$ is studied by means of electron spin resonance (ESR). The spectra for low concentration samples $(xensuremath{lesssim}0.001)$ show a split spectrum due to cubic crystal field effects (CFE). The line shape of each fine structure line is Lorentzian, indicating an insulating environment for the ${mathrm{Gd}}^{3+}$ ions. For higher concentrations $(0.003ensuremath{lesssim}xensuremath{lesssim}0.01),$ the spectra show a single resonance $[g=1.992(4),ensuremath{Delta}{H}_{1/2}ensuremath{approx}20--60 mathrm{Oe}]$ with no CFE and Dysonian line shape indicating metallic environment for the ${mathrm{Gd}}^{3+}$ ions. For intermediate concentrations, a coexistence of spectra corresponding to insulating and metallic regions is observed. Most of the measured samples show the weak ferromagnetism (WF) as reported for ${mathrm{Ca}}_{0.995}{mathrm{La}}_{0.005}{mathrm{B}}_{6},$ but, surprisingly, this WF has no effect in our ESR spectra either for metallic or insulating environments. This result suggests that the WF in these systems might be isolated in clusters (defect-rich regions) and its relationship with metallicity is nontrivial." @default.
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- W2495276601 date "2002-05-03" @default.
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- W2495276601 title "Different<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Gd</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>sites in doped<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CaB</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>:</mml…" @default.
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- W2495276601 doi "https://doi.org/10.1103/physrevb.65.180407" @default.
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