Magnetic ground state of YbCo<sub>2</sub>Zn<sub>20</sub> probed by muon spin relaxation

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<jats:title>Abstract</jats:title> <jats:p>The cubic compound YbCo<jats:sub>2</jats:sub>Zn<jats:sub>20</jats:sub> has huge electronic specific heat coefficient <jats:italic>γ</jats:italic>=7900 mJ/molK<jats:sup>2</jats:sup> and its ground state could be located in the vicinity of the quantum critical point. To investigate magnetic ground state, we have carried out muon spin relaxation measurements and confirmed non-magnetic ground state with fluctuating tiny magnetic moment.</jats:p>

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