Exchange Interaction in the Insulating Phase of RNiO 3
作者： J.-S. Zhou , J. B. Goodenough , B. Dabrowski
DOI: 10.1103/PHYSREVLETT.95.127204
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摘要: In order to characterize the spin-spin exchange interactions responsible for Type-${E}^{\ensuremath{'}}$ antiferromagnetic in inhomogeneous ${\mathrm{RNiO}}_{3}$ perovskites ($R=\mathrm{Y}$ or rare earth), pressure dependence of N\'eel temperature ${T}_{\mathrm{N}}$ was systematically measured samples with ${T}_{\mathrm{N}}l{T}_{\mathrm{IM}}$ and ${T}_{\mathrm{N}}={T}_{\mathrm{IM}}$; ${T}_{\mathrm{IM}}$ is an insulator-metal transition temperature. Analysis results shows that, as superexchange, perturbation theory can be used describe interatomic ${T}_{\mathrm{N}}l{T}_{\mathrm{IM}}$, but breaks down where approaches ${T}_{\mathrm{IM}}$.
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