Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-04-12
J. Phys.: Condens. Matter 16 (2004) 3355
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 3 figures
Scientific paper
10.1088/0953-8984/16/20/006
The charge transfer antiferromagnetic (T$_{N}$ =220 K) insulator EuNiO$_{3}$ undergoes, at ambient pressure, a temperature-induced metal insulator MI transition at T$_{MI}$=463 K. We have investigated the effect of pressure (up to p~20 GPa) on the electronic, magnetic and structural properties of EuNiO$_{3}$ using electrical resistance measurements, ${151}^$Eu nuclear resonance scattering of synchrotron radiation and x-ray 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 pressure-induced metallic state exhibits magnetic order with a lowervalue of T$_{N}$ (T$_{N}$ ~120 K at 9.4 GPa) which disappears between 9.4 and 14.4 GPa.
Abd-Elmeguid M. M.
Alonso Jose Antonio
Barla Annalisa
Lengsdorf R.
Martínez-Lope María Jesús
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