The observation of the insulator metal transition in EuNiO_{3} under high pressure
Abstract
The charge transfer antiferromagnetic (T_{N} = 220 K) insulator EuNiO_{3} undergoes, at ambient pressure, a temperatureinduced metalinsulator (MI) transition at T_{MI} = 463 K. We have investigated the effect of pressure (up to p\approx 20~{\mathrm {GPa}} ) on the electronic, magnetic and structural properties of EuNiO_{3} using electrical resistance measurements, ^{151}Eu nuclear resonance scattering of synchrotron radiation and xray diffraction, respectively. With increasing pressure we find at p_{c} = 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 pressureinduced metallic state exhibits magnetic order with a lower value of T_{N} (T_{{\mathrm {N}}} \approx 120~{\mathrm {K}} at 9.4 GPa) which disappears between 9.4 and 14.4 GPa.
 Publication:

Journal of Physics Condensed Matter
 Pub Date:
 May 2004
 DOI:
 10.1088/09538984/16/20/006
 arXiv:
 arXiv:condmat/0504285
 Bibcode:
 2004JPCM...16.3355L
 Keywords:

 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 10 pages, 3 figures