Theory of charge and spin ordering in the nickelates - Physics ...
Theory of charge and spin ordering in the nickelates - Physics ...
Theory of charge and spin ordering in the nickelates - Physics ...
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Valence skipp<strong>in</strong>g<br />
Maz<strong>in</strong> et al, 2007: <strong>the</strong>oretically suggest mixed<br />
valence PRL 98, state 176406 to (2007) enhance exchange<br />
FIG. 1 (color onl<strong>in</strong>e). Schematic electronic level diagram <strong>of</strong> Ni<br />
But: Why <strong>the</strong> complex magnetic <strong>order<strong>in</strong>g</strong><br />
ions <strong>in</strong> RNiO 3 <strong>in</strong> two cases: (a) two JT distorted Ni<br />
pattern?<br />
3 ions<br />
(energy ga<strong>in</strong> E JT per site), <strong>and</strong> (b) <strong>charge</strong> disproportionation.<br />
c.f. Mizokawa, Khomskii, Sawatzky, 2000<br />
<strong>and</strong> <strong>in</strong> <strong>the</strong> fully delocalized limit, <strong>the</strong> additional Coulomb<br />
energy due to CO is reduced to <strong>the</strong> Hartree energy, a very<br />
strong reduction. Fur<strong>the</strong>rmore, delocalization <strong>of</strong>ten leads<br />
PHYSICAL REVIEW LETTERS<br />
even <strong>the</strong> magnetic <strong>in</strong>st<br />
paramagnetic metal do<br />
disproportionation. Ex<br />
manifests itself <strong>in</strong> oxyg<br />
netic moments on <strong>the</strong> tw<br />
contrary to popular be<br />
Mott-Hubbard <strong>in</strong>sulato<br />
The <strong>in</strong>sulator-metal<br />
structure <strong>in</strong> RNiO 3 are<br />
0:7 B for Ni 2 <strong>in</strong> YNi<br />
1:4 B <strong>and</strong> 0:6 B for H<br />
A close <strong>in</strong>spection<br />
tional b<strong>and</strong> picture give<br />
it is capable <strong>of</strong> expla<br />
occurs <strong>in</strong> <strong>the</strong> crossover<br />
erant states along <strong>the</strong><br />
b<strong>and</strong> structure calculat<br />
zation <strong>of</strong> <strong>the</strong> nonmag