Abstract
We have measured the electrical resistivity ρ(T) of heavy fermion antiferromagnet YbNi3Al9 under hydrostatic pressure up to 8 GPa. We found that the antiferromagnetic ordering temperature TN is suppressed with increasing pressure, whereas the localized character of the trivalent Yb state becomes stronger inferred from the reduction of the Kondo scattering. We will discuss the possible origin of the suppression of TN under pressure.
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