Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-12-10
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures, accepted PRB - Brief Report Dec.2004
Scientific paper
10.1103/PhysRevB.71.012104
The short-range organization around Ni atoms in orthorhombic $R$NiO$_{3}$ ($R$=Pr,Nd,Eu) perovskites has been studied over a wide temperature range by Ni K-edge x-ray absorption spectroscopy. Our results demonstrate that two different Ni sites, with different average Ni-O bond lengths, coexist in those orthorhombic compounds and that important modifications in the Ni nearest neighbors environment take place across the metal-insulator transition. We report evidences for the existence of short-range charge-order in the insulating state, as found in the monoclinic compounds. Moreover, our results suggest that the two different Ni sites coexists even in the metallic state. The coexistence of two different Ni sites, independently on the $R$ ion, provides a common ground to describe these compounds and shed new light in the understanding of the phonon-assisted conduction mechanism and unusual antiferromagnetism present in all $R$NiO$_{3}$ compounds.
Alonso Jose A.
Casais Maria T.
Martínez-Lope Maria J.
Massa Nestor E.
Piamonteze Cinthia
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