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="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mn>0</mml:mn><mml:mo>⩽</mml:mo><mml:mi>x</mml:mi><mml:mo>⩽</mml:mo><mml:mn>0.5</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math>

DOI DOI Web Site Web Site 被引用文献20件 オープンアクセス

書誌事項

公開日
2005-07-05
権利情報
  • http://link.aps.org/licenses/aps-default-license
DOI
  • 10.1103/physrevb.72.045104
  • 10.48550/arxiv.cond-mat/0502066
公開者
American Physical Society (APS)

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説明

Metal-insulator transitions strongly coupled with lattice were found in Bi1-xLaxNiO3. Synchrotron X-ray powder diffraction revealed that pressure (P ~ 3 GPa, T = 300 K), temperature (T ~ 340 K, x = 0.05), and La-substitution (x ~ 0.075, T = 300 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 ANiO3 series, an electronic state of the metallic phase can be described as [A3+Ld, Ni2+L1-d], where a ligand-hole L contributes to a conductivity. We depicted a schematic P-T phase diagram of BiNiO3 including a critical point (3 GPa, 300 K) and an inhomogeneous region, which implies universality of ligand-hole dynamics in ANiO3 (A = Bi, Pr, Nd,...).

24 pages, 8 figures, Phys. Rev. B in press

収録刊行物

  • Physical Review B

    Physical Review B 72 (4), 045104-, 2005-07-05

    American Physical Society (APS)

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