The charge transfer antiferromagnetic (TN =220 K) insulator EuNiO3
undergoes, at ambient pressure, a temperature-induced metal insulator MI
transition at TMI=463 K. We have investigated the effect of pressure (up
to p~20 GPa) on the electronic, magnetic and structural properties of
EuNiO3 using electrical resistance measurements, {151}^Eu nuclear
resonance scattering of synchrotron radiation and x-ray diffraction,
respectively. With increasing pressure we find at pc =5.8 GPa a transition
from the insulating state to a metallic state, while the orthorhombic structure
remains unchanged up to 20 GPa. The results are explained in terms of a gradual
increase of the electronic bandwidth with increasing pressure, which results in
a closing of the charge transfer gap. It is further shown that the
pressure-induced metallic state exhibits magnetic order with a lowervalue of
TN (TN ~120 K at 9.4 GPa) which disappears between 9.4 and 14.4 GPa.Comment: 10 pages, 3 figure