Abstract
We have performed Ce 4 d – 4 f resonant photoemission (RPE) spectroscopy on the isostructural heavy fermion system CeNiGe 2 - x Si x ( 0 ⩽ x ⩽ 1 ) . With increasing x, the unit volume decreases by about 5% and the ground state originating in Ce 4f character varies from an antiferromagnetic regime (AFM, 0 ⩽ x ⩽ 0.8 ) to a quantum critical point (QCP, x = 1 ). RPE data reveals that the cf-hybridization intensity becomes stronger as the ground state of Ce 4f electron changes from AFM to QCP, which is exclusively caused by the increase of chemical pressure due to the reduction of lattice constant in CeNiGe 2 - x Si x system.
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