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Strain effects in perovskite manganites

Arulraj, Anthony; Dinnebier, Robert E.; Carlson, Stefan LU ; Hanfland, Michael and van Smaalen, Sander (2007) In Progress in Solid State Chemistry 35(2-4). p.367-377
Abstract
Colossal magnetoresistance (CMR) - the dramatic reduction of electrical resistivity in a magnetic field and charge ordering (CO) in rare earth manganites of the type Ln(1-x)A(x)MnO(3) [Ln: rare earth, A: divalent cation] are manifestations of the intricate relation between orbital, spin, charge and lattice degrees of freedom. Recent studies indicate that the inhomogeneous state of mixed-valence manganites - evidenced by the presence of texture and multiple phase coexistence - is important for the CMR property of manganites. Theoretical models that explain the multiphase coexistence are based on quenched disorder or strain. Here we show that lattice strain due to the Jahn-Teller (IT) distortions of MnO6 octahedra and their tilt rotations... (More)
Colossal magnetoresistance (CMR) - the dramatic reduction of electrical resistivity in a magnetic field and charge ordering (CO) in rare earth manganites of the type Ln(1-x)A(x)MnO(3) [Ln: rare earth, A: divalent cation] are manifestations of the intricate relation between orbital, spin, charge and lattice degrees of freedom. Recent studies indicate that the inhomogeneous state of mixed-valence manganites - evidenced by the presence of texture and multiple phase coexistence - is important for the CMR property of manganites. Theoretical models that explain the multiphase coexistence are based on quenched disorder or strain. Here we show that lattice strain due to the Jahn-Teller (IT) distortions of MnO6 octahedra and their tilt rotations are not sufficient to provide a unique structure-property relation. We present evidence that the science of manganites should take into account shear distortions of the MnO6 octahedra as well. Pressure evolution of the lattice strain of Nd0.5Ca0.5MnO3 shows a minimum around 7 GPa, with the same lattice strain above and below this pressure achieved by shear- and JT-type distortions, respectively. In general, a particular lattice strain of manganites can be achieved by different combinations of JT-type and shear-type distortions of the MnO6 octahedra, together with their tilts, which suggest a plausible description of the inhomogeneous state in manganites as one where phases with differently distorted states having the same lattice strain are preserved. (C) 2007 Published by Elsevier Ltd. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Jahn-Teller distortion, shear strain, manganites, lattice distortion, perovskites
in
Progress in Solid State Chemistry
volume
35
issue
2-4
pages
367 - 377
publisher
Elsevier
external identifiers
  • wos:000248298000021
  • scopus:34347207591
ISSN
1873-1643
DOI
10.1016/j.progsolidstchem.2007.01.034
language
English
LU publication?
yes
id
7bd62553-e6c5-4af5-910c-06e1161e20eb (old id 693104)
date added to LUP
2007-12-04 16:35:16
date last changed
2017-04-09 03:38:26
@article{7bd62553-e6c5-4af5-910c-06e1161e20eb,
  abstract     = {Colossal magnetoresistance (CMR) - the dramatic reduction of electrical resistivity in a magnetic field and charge ordering (CO) in rare earth manganites of the type Ln(1-x)A(x)MnO(3) [Ln: rare earth, A: divalent cation] are manifestations of the intricate relation between orbital, spin, charge and lattice degrees of freedom. Recent studies indicate that the inhomogeneous state of mixed-valence manganites - evidenced by the presence of texture and multiple phase coexistence - is important for the CMR property of manganites. Theoretical models that explain the multiphase coexistence are based on quenched disorder or strain. Here we show that lattice strain due to the Jahn-Teller (IT) distortions of MnO6 octahedra and their tilt rotations are not sufficient to provide a unique structure-property relation. We present evidence that the science of manganites should take into account shear distortions of the MnO6 octahedra as well. Pressure evolution of the lattice strain of Nd0.5Ca0.5MnO3 shows a minimum around 7 GPa, with the same lattice strain above and below this pressure achieved by shear- and JT-type distortions, respectively. In general, a particular lattice strain of manganites can be achieved by different combinations of JT-type and shear-type distortions of the MnO6 octahedra, together with their tilts, which suggest a plausible description of the inhomogeneous state in manganites as one where phases with differently distorted states having the same lattice strain are preserved. (C) 2007 Published by Elsevier Ltd.},
  author       = {Arulraj, Anthony and Dinnebier, Robert E. and Carlson, Stefan and Hanfland, Michael and van Smaalen, Sander},
  issn         = {1873-1643},
  keyword      = {Jahn-Teller distortion,shear strain,manganites,lattice distortion,perovskites},
  language     = {eng},
  number       = {2-4},
  pages        = {367--377},
  publisher    = {Elsevier},
  series       = {Progress in Solid State Chemistry},
  title        = {Strain effects in perovskite manganites},
  url          = {http://dx.doi.org/10.1016/j.progsolidstchem.2007.01.034},
  volume       = {35},
  year         = {2007},
}