Abstract
The temperature dependence of muon spin relaxation rate exhibits a significant increase below ~130 K in CaB6 and ~110 K in BaB6, 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 (µLCR) exhibits a step like change at ~110 K in CaB6. 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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