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• W2050343683 abstract "Metal-insulator transitions strongly coupled with lattice were found in ${mathrm{Bi}}_{1ensuremath{-}x}{mathrm{La}}_{x}{mathrm{NiO}}_{3}$. Synchrotron x-ray powder diffraction revealed that pressure ($Pensuremath{sim}3phantom{rule{0.3em}{0ex}}mathrm{GPa}$, $T=300phantom{rule{0.3em}{0ex}}mathrm{K}$), temperature ($Tensuremath{sim}340phantom{rule{0.3em}{0ex}}mathrm{K}$, $x=0.05$), and La substitution ($xensuremath{sim}0.075$, $T=300phantom{rule{0.3em}{0ex}}mathrm{K}$) caused the similar structural change from a triclinic (insulating) to an orthorhombic (metallic) symmetry, suggesting melting of the A-site charge disproportionation. Comparing crystal structure and physical properties with the other $A{mathrm{NiO}}_{3}$ series, an electronic state of the metallic phase can be described as [${A}^{3+}{underset{̱}{L}}^{ensuremath{delta}}$, ${mathrm{Ni}}^{2+}{underset{̱}{L}}^{1ensuremath{-}ensuremath{delta}}$], where a ligand-hole $underset{̱}{L}$ contributes to a conductivity. We depicted a schematic $Ptext{ensuremath{-}}T$ phase diagram of ${mathrm{BiNiO}}_{3}$ including a critical point (3 GPa, 300 K) and an inhomogeneous region, which implies universality of ligand-hole dynamics in $A{mathrm{NiO}}_{3}$ ($A=mathrm{Bi}$, Pr, Nddots{} )." @default.
• W2050343683 created "2016-06-24" @default.
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• W2050343683 date "2005-07-05" @default.
• W2050343683 modified "2023-09-30" @default.
• W2050343683 title "Pressure/temperature/substitution-induced melting of<i>A</i>-site charge disproportionation in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>La</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>NiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=…" @default.
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• W2050343683 doi "https://doi.org/10.1103/physrevb.72.045104" @default.
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