Pressure/temperature/substitution-induced melting of A-site charge disproportionation in Bi{sub 1-x}La{sub x}NiO{sub 3} (0{<=}x{<=}0.5)

Journal Article · Fri Jul 15 00:00:00 EDT 2005 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.72.045104· OSTI ID:20719158

Ishiwata, S; Takano, M ^[1]; Azuma, M ^[1]; Hanawa, M; Moritomo, Y ^[2]; Ohishi, Y ^[3]; Kato, K; Takata, M ^[3]; Nishibori, E; Sakata, M ^[4]; Terasaki, I ^[5]

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1. Institute for Chemical Research, Kyoto University, Gokashou, Uji 611-0011 (Japan)
2. PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012 (Japan)
3. JASRI, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Mikazuki-cho, Sayo-gun, Hyogo 679-5198 (Japan)
4. Department of Applied Physics, Nagoya University, Furo-cho, Chigusa-ku, Nagoya 464-8601 (Japan)
5. Department of Applied Physics, Waseda University, Ookubo, Shinjuku, Tokyo 169-8555 (Japan)

Metal-insulator transitions strongly coupled with lattice were found in Bi{sub 1-x}La{sub x}NiO{sub 3}. Synchrotron x-ray powder diffraction revealed that pressure (P{approx}3 GPa, T=300 K), temperature (T{approx}340 K, x=0.05), and La substitution (x{approx}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 ANiO{sub 3} series, an electronic state of the metallic phase can be described as [A{sup 3+}L lowbar {sup {delta}}, Ni{sup 2+}L lowbar {sup 1-{delta}}], where a ligand-hole L lowbar contributes to a conductivity. We depicted a schematic P-T phase diagram of BiNiO{sub 3} including a critical point (3 GPa, 300 K) and an inhomogeneous region, which implies universality of ligand-hole dynamics in ANiO{sub 3} (A=Bi, Pr, Nd... )

• OSTI ID: 20719158
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 72, Issue 4; Other Information: DOI: 10.1103/PhysRevB.72.045104; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH COMPOUNDS
CRYSTAL STRUCTURE
CRYSTALS
HOLES
LANTHANUM COMPOUNDS
LIGANDS
MELTING
MELTING POINTS
METALS
NICKEL IONS
OXIDATION
PHASE DIAGRAMS
PRESSURE DEPENDENCE
PRESSURE RANGE GIGA PA
SYMMETRY
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION