A photoemission spectroscopy study of PrNiO3 through the metal-insulator transition
Laboratory for Neutron Scattering, ETH Zürich & PSI, CH-5232 Villigen PSI, Switzerland
2 Institut de Physique, Université de Neuchâtel - CH-2000 Neuchâtel, Switzerland
3 Laboratoire des Fluorures, Université du Maine, Avenue Olivier-Messiaen, F-72017 Le Mans Cedex, France.
Accepted: 26 January 1997
In this paper we report ultraviolet photoemission data from , the first member of the rare-earth nickelate series to undergo a metal-to-insulator transition at a finite temperature, . Photoemission spectra from the Fermi level region as a function of temperature show the clear opening-up of the gap in the quasi-particle density of states at TMI. A discontinuity in the slope of the integrated photoemission signal from the immediate Fermi level region allows an exact determination of TMI. Near Fermi level spectra from , which does not exhibit a metal-to-insulator transition, are shown alongside the data for comparison.
PACS: 71.30.+h – Metal-insulator transitions and other electronic transitions / 79.60.-i – Photoemission and photoelectron spectra / 71.20.-b – Electron density of states and band structure of crystalline solids
© EDP Sciences, 1997