Magnetic phase separation in europium hexaboride and its relation to the Kondo interaction
T. S. AltshulerRussian Academy of SciencesYu. V. GoryunovZavoiskii Physicotechnical Institute, Russian Academy of Sciences, Sibirskii trakt 10/7, Kazan 29, 420029, RussiaA. V. DukhnenkoFrantsevich Institute of Materials Science Problems, National Academy of Sciences of Ukraine, ul. Krzhizhanovskogo 3, Kiev, 03680, UkraineN. Yu. ShitsevalovaFrantsevich Institute of Materials Science Problems, National Academy of Sciences of Ukraine, ul. Krzhizhanovskogo 3, Kiev, 03680, Ukraine
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Europium hexaboride single crystals have been investigated using the electron paramagnetic resonance at a frequency of 9.25 GHz in the temperature range 10–300 K. The magnetic phase separation of the spin system of europium ions Eu2+ is observed. The cause of the separation is the formation of the polarons of two types associated with the Kondo and anti-Kondo couplings of charge carriers of the valence and conduction bands, respectively, with the localized magnetic moments of Eu2+.
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