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Possible weak magnetism in MB$$_6$$ (M: Ca, Ba) probed by muon spin relaxation and muon level-crossing resonance

Kuroiwa, Sogo*; Takagiwa, Hiroyuki*; Yamazawa, Maki*; Akimitsu, Jun*; Koda, Akihiro*; Kadono, Ryosuke*; Oishi, Kazuki; Higemoto, Wataru; Watanabe, Isao*

The temperature dependence of muon spin relaxation rate exhibits a significant increase below $$sim$$130 K in CaB$$_6$$ and $$sim$$110 K in BaB$$_6$$, while no sigh of spontaneous muon precession signal under a zero field is observed. Moreover, the electric field gradient at the boron site measured by muon level-crossing resonance exhibits a step like change at $$sim$$110 K in CaB$$_6$$. These results suggest a change in electronic state and the associated emergence of weak random magnetism below 110-130 K in these alkaline earth hexaborides.

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Category:Materials Science, Multidisciplinary

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