Effect of oxygen isotope substitution and crystal microstructure on magnetic ordering and phase separation in (La{sub 1-y}Pr{sub y}){sub 0.7}Ca{sub 0.3}MnO{sub 3}

Journal Article · Thu Feb 01 00:00:00 EST 2007 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.75.054410· OSTI ID:20976674

Pomjakushin, V Yu; Sheptyakov, D V; Conder, K; Pomjakushina, E V; Balagurov, A M ^[1]

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1. Laboratory for Neutron Scattering, ETH Zurich (Switzerland) and Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)

The crystal and magnetic structures of the specified CMR manganite system have been studied as a function of y=(0.2-1) across the metal-insulator (MI) transition, and of the oxygen mass ({sup 16}O, {sup 18}O). We quantitatively show how the polaronic narrowing of the carrier bandwidth and the crystal lattice microstrains control the volume fractions of the mesoscopic ferromagnetic and antiferromagnetic clusters. A well-defined dip in the transition temperatures and the suppression of all the types of long range ordering seen near the MI transition at y{approx_equal}0.9 indicate a key role of the quenched disorder for the formation of the long-scale phase separated state.

• OSTI ID: 20976674
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 75, Issue 5; Other Information: DOI: 10.1103/PhysRevB.75.054410; (c) 2007 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
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
CALCIUM COMPOUNDS
CRYSTAL LATTICES
CRYSTALS
FERROMAGNETIC MATERIALS
LANTHANUM COMPOUNDS
MAGNETIZATION
MICROSTRUCTURE
OXYGEN
OXYGEN 16
OXYGEN 18
POLARONS
PRASEODYMIUM COMPOUNDS
TRANSITION TEMPERATURE