Abstract
Surprisingly for a compound with no magnetic element, Young et al.1 have observed ferromagnetism in calcium hexaboride (CaB6) doped with lanthanum (La) — the system has a ferromagnetic Curie temperature as high as 600 K, which is comparable to that of transition-metal ferromagnets such as iron (Fe). Here we show that high-temperature ferromagnetism in this CaB6 system is not intrinsic but that it is instead due to alien phases of iron and boride.
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References
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Matsubayashi, K., Maki, M., Tsuzuki, T. et al. Parasitic ferromagnetism in a hexaboride?. Nature 420, 143–144 (2002). https://doi.org/10.1038/420143b
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DOI: https://doi.org/10.1038/420143b
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