Structure-properties phase diagram for La{sub 1{minus}x}Sr{sub x}MnO{sub 3} (0.1{le}x{le}0.2)

Journal Article · Wed Sep 01 00:00:00 EDT 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.60.7006· OSTI ID:689927

Dabrowski, B; Xiong, X; Bukowski, Z; Dybzinski, R; Klamut, P W; Siewenie, J E; Chmaissem, O; Shaffer, J; Kimball, C W ^[1]; Jorgensen, J D; Short, S ^[2]

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1. Department of Physics, Northern Illinois University, DeKalb, Illinois 60115 (United States)
2. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

By combining the results of magnetization, resistivity, and neutron powder-diffraction data for stoichiometric La{sub 1{minus}x}Sr{sub x}MnO{sub 3}, we have constructed a phase diagram that describes the magnetic, transport, and structural properties and the relationships among them as a function of composition (0.1{le}x{le}0.2) and temperature (10{endash}340 K). We show that, with increasing Sr content, the Curie temperature increases linearly, while the temperature of an orbital ordering transition to a state with a large coherent Jahn-Teller (JT) distortion decreases. These two phase-transition lines cross at x=0.145 and T=210&hthinsp;K. When the transition to the ferromagnetic state occurs in a phase that has a large coherent JT distortion (x{lt}0.145), a strong magnetolattice coupling is observed; the coherent JT distortion is dramatically reduced and the incoherent distortion is enhanced in the ferromagnetic phase. For x{gt}0.145, where the coherent JT distortion is small above Curie temperature, magnetolattice coupling reduces the incoherent distortion at T{sub C} and strongly suppresses the transition to a phase with a large coherent JT distortion. These observations are consistent with a competition between ferromagnetism and JT distortion that is mediated by a colossal spin-charge-lattice coupling. A metallic state occurs below the Curie temperature when both coherent and incoherent JT distortions are suppressed. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 689927
• Journal Information: Physical Review, B: Condensed Matter, Vol. 60, Issue 10; Other Information: PBD: Sep 1999
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
LANTHANUM COMPOUNDS
STRONTIUM COMPOUNDS
ELECTRIC CONDUCTIVITY
CURIE POINT
PHASE DIAGRAMS
MAGNETIZATION
NEUTRON DIFFRACTION
STOICHIOMETRY
LANTHANUM OXIDES
MANGANESE OXIDES
MECHANICAL PROPERTIES
TEMPERATURE RANGE 0065-0273 K
FERROMAGNETIC MATERIALS
FERROMAGNETISM
JAHN-TELLER EFFECT
TEMPERATURE RANGE 0273-0400 K
MAGNETORESISTANCE
CRYSTAL STRUCTURE
PHONONS