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Title: High-temperature order-disorder transition and polaronic conductivity in PrBaCo{sub 2}O{sub 5.48}

Abstract

Neutron powder diffraction and transport measurements have been used to investigate the PrBaCo{sub 2}O{sub 5.48} compound between room temperature and 820 K. A structural phase transition, involving a rearrangement of oxygen vacancies, was found at T{sub OD}=776 K. Across the transition the perovskite structure loses its vacancy ordering, and the crystal symmetry changes from orthorhombic Pmmm to tetragonal P4/mmm. The resistivity measurements for temperatures above {approx}350 K yield high values of {rho}, indicating that the compound is rather semiconducting than metallic as usually accepted. A model in terms of thermally activated hole (polaronic) hopping is proposed.

Authors:
; ; ;  [1]; ; ;  [2];  [3];  [2]; ; ;  [4]
  1. Laboratory for Neutron Scattering, ETH Zuerich and Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)
  2. Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)
  3. (Switzerland)
  4. Institute of Solid State Chemistry RAS, Ekaterinburg 620219 (Russian Federation)
Publication Date:
OSTI Identifier:
20787957
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 73; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevB.73.094203; (c) 2006 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; BARIUM COMPOUNDS; COBALT OXIDES; CRYSTALS; ELECTRIC CONDUCTIVITY; HOLES; NEUTRON DIFFRACTION; ORDER-DISORDER TRANSFORMATIONS; ORTHORHOMBIC LATTICES; OXYGEN; PEROVSKITE; POLARONS; PRASEODYMIUM COMPOUNDS; SYMMETRY; TEMPERATURE DEPENDENCE; TETRAGONAL LATTICES; VACANCIES

Citation Formats

Streule, S., Podlesnyak, A., Sheptyakov, D., Mesot, J., Pomjakushina, E., Stingaciu, M., Medarde, M., Laboratory for Neutron Scattering, ETH Zuerich and Paul Scherrer Institut, CH-5232 Villigen PSI, Conder, K., Patrakeev, M. V., Leonidov, I. A., and Kozhevnikov, V. L. High-temperature order-disorder transition and polaronic conductivity in PrBaCo{sub 2}O{sub 5.48}. United States: N. p., 2006. Web. doi:10.1103/PHYSREVB.73.0.
Streule, S., Podlesnyak, A., Sheptyakov, D., Mesot, J., Pomjakushina, E., Stingaciu, M., Medarde, M., Laboratory for Neutron Scattering, ETH Zuerich and Paul Scherrer Institut, CH-5232 Villigen PSI, Conder, K., Patrakeev, M. V., Leonidov, I. A., & Kozhevnikov, V. L. High-temperature order-disorder transition and polaronic conductivity in PrBaCo{sub 2}O{sub 5.48}. United States. doi:10.1103/PHYSREVB.73.0.
Streule, S., Podlesnyak, A., Sheptyakov, D., Mesot, J., Pomjakushina, E., Stingaciu, M., Medarde, M., Laboratory for Neutron Scattering, ETH Zuerich and Paul Scherrer Institut, CH-5232 Villigen PSI, Conder, K., Patrakeev, M. V., Leonidov, I. A., and Kozhevnikov, V. L. Wed . "High-temperature order-disorder transition and polaronic conductivity in PrBaCo{sub 2}O{sub 5.48}". United States. doi:10.1103/PHYSREVB.73.0.
@article{osti_20787957,
title = {High-temperature order-disorder transition and polaronic conductivity in PrBaCo{sub 2}O{sub 5.48}},
author = {Streule, S. and Podlesnyak, A. and Sheptyakov, D. and Mesot, J. and Pomjakushina, E. and Stingaciu, M. and Medarde, M. and Laboratory for Neutron Scattering, ETH Zuerich and Paul Scherrer Institut, CH-5232 Villigen PSI and Conder, K. and Patrakeev, M. V. and Leonidov, I. A. and Kozhevnikov, V. L.},
abstractNote = {Neutron powder diffraction and transport measurements have been used to investigate the PrBaCo{sub 2}O{sub 5.48} compound between room temperature and 820 K. A structural phase transition, involving a rearrangement of oxygen vacancies, was found at T{sub OD}=776 K. Across the transition the perovskite structure loses its vacancy ordering, and the crystal symmetry changes from orthorhombic Pmmm to tetragonal P4/mmm. The resistivity measurements for temperatures above {approx}350 K yield high values of {rho}, indicating that the compound is rather semiconducting than metallic as usually accepted. A model in terms of thermally activated hole (polaronic) hopping is proposed.},
doi = {10.1103/PHYSREVB.73.0},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 9,
volume = 73,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2006},
month = {Wed Mar 01 00:00:00 EST 2006}
}