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Strain effects in perovskite manganites

Titelangaben

Arulraj, Anthony ; Dinnebier, Robert E. ; Carlson, Stefan ; Hanfland, Michael ; van Smaalen, Sander:
Strain effects in perovskite manganites.
In: Progress in Solid State Chemistry. Bd. 35 (2007) Heft 2–4 . - 367 - 377.
ISSN 0079-6786
DOI: https://doi.org/10.1016/j.progsolidstchem.2007.01.034

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 Ln1−xAxMnO3 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 (JT) 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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: International Conference on Perovskites at EMPA, 2005.Properties and Potential Applications
Keywords: Perovskites
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften > Lehrstuhl Kristallographie > Lehrstuhl Kristallographie - Univ.-Prof. Dr. Sander van Smaalen
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften > Lehrstuhl Kristallographie
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 26 Feb 2016 07:38
Letzte Änderung: 26 Feb 2016 07:38
URI: https://eref.uni-bayreuth.de/id/eprint/31175