Abstract
A heavy-fermion antiferromagnet Ce2NiGa12 has been studied at a viewpoint of pressure effects. Electrical resistivity measurements show that the antiferromagnetic ordering is suppressed at PC ~ 5.5 GPa, and that Fermi liquid behaviour is observed above PC. To investigate how Ce valence state is associated with the observed critical phenomena, X-ray absorption spectra at Ce L3-edge have been performed. Ce valence state drastically varies at Pv ~ 9 GPa in the initial applying pressure process, whereas anomalous behaviour is not observed in the Ce valence under pressures around PC. Consequently, the quantum critical phenomena in Ce2NiGa12 around PC is not strongly connected with Ce valence state.
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