We studied an effect of pressure on the heavy fermion state of YbCo 2Zn20 under magnetic fields. The critical pressure P c, where the electronic state changes from the heavy fermion state to the antiferromagnetic state, is estimated to be Pc≃1.8 GPa. The super-heavy fermion state in the Pc region is found to be strongly destroyed in magnetic fields for H ∥<100>. The field-induced quadrupolar phase, which is most likely realized only for H ∥<100>, is found to be robust even in the antiferromagnetic pressure region.
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