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Title: 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}

Abstract

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.

Authors:
; ; ; ;  [1];  [2];  [2];  [3]
  1. Laboratory for Neutron Scattering, ETH Zurich (Switzerland) and Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)
  2. (Switzerland)
  3. (Russian Federation)
Publication Date:
OSTI Identifier:
20976674
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevB.75.054410; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Pomjakushin, V. Yu., Sheptyakov, D. V., Conder, K., Pomjakushina, E. V., Balagurov, A. M., Laboratory for Developments and Methods, PSI, CH-5232 Villigen PSI, Laboratory for Developments and Methods, PSI, CH-5232 Villigen PSI, Switzerland and Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institut, CH-5232 Villigen PSI, and Frank Laboratory of Neutron Physics, JINR, 141980, Dubna. 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}. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.054410.
Pomjakushin, V. Yu., Sheptyakov, D. V., Conder, K., Pomjakushina, E. V., Balagurov, A. M., Laboratory for Developments and Methods, PSI, CH-5232 Villigen PSI, Laboratory for Developments and Methods, PSI, CH-5232 Villigen PSI, Switzerland and Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institut, CH-5232 Villigen PSI, & Frank Laboratory of Neutron Physics, JINR, 141980, Dubna. 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}. United States. doi:10.1103/PHYSREVB.75.054410.
Pomjakushin, V. Yu., Sheptyakov, D. V., Conder, K., Pomjakushina, E. V., Balagurov, A. M., Laboratory for Developments and Methods, PSI, CH-5232 Villigen PSI, Laboratory for Developments and Methods, PSI, CH-5232 Villigen PSI, Switzerland and Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institut, CH-5232 Villigen PSI, and Frank Laboratory of Neutron Physics, JINR, 141980, Dubna. Thu . "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}". United States. doi:10.1103/PHYSREVB.75.054410.
@article{osti_20976674,
title = {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}},
author = {Pomjakushin, V. Yu. and Sheptyakov, D. V. and Conder, K. and Pomjakushina, E. V. and Balagurov, A. M. and Laboratory for Developments and Methods, PSI, CH-5232 Villigen PSI and Laboratory for Developments and Methods, PSI, CH-5232 Villigen PSI, Switzerland and Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institut, CH-5232 Villigen PSI and Frank Laboratory of Neutron Physics, JINR, 141980, Dubna},
abstractNote = {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.},
doi = {10.1103/PHYSREVB.75.054410},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 5,
volume = 75,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2007},
month = {Thu Feb 01 00:00:00 EST 2007}
}