Domain Structure and Colossal Magnetoresistance of La1−xSrxCoO3 and La1−xCaxMnO3

1995 ◽  
Vol 401 ◽  
Author(s):  
Z. L. Wang ◽  
Jiming Zhang ◽  
Y. Berta
Keyword(s):  
Domain Structure ◽  
Colossal Magnetoresistance ◽  
Type Structure ◽  
Direct Result ◽  
Ordered Structure ◽  
Lcmo Film ◽  
Negative Effect ◽  
Perovskite Type ◽  
Tetragonal Cell ◽  
Perovskite Type Structure

AbstractLa1−xSrxCoO3 (LSCO) and La1−xCaxMnO3 (LCMO) are a class of magnetic oxides exhibiting the colossal magnetoresistance (CMR) effect. However, the CMR ratio of LSCO is much lower than that of LCMO. Microstructure studies were carried out to understand this difference. In La0.5Sr0.5CoO3 (LSCO), an ordered, anisotropic perovskite-type structure n-LSCO was observed. The ordered structure has a tetragonal cell with a La-Co-Sr-Co- [001] layered atom distribution along the c-axis. This new structure is intrinsic for the LSCO system and is a direct result of the lattice substitution between La and Sr. The entire film is composed of [001], [010] and [100] anisotropic domains with sizes on the order of 30–200 nm. The La0 7Ca0.3MnO3 (LCMO) film, however, does not exhibit a domain structure. It is concluded that the domain structure may have negative effect on the CMR ratio.

Optical Spectra, EPR, and Spin–Lattice Relaxation of Yb3+ Ions in Crystals Having Perovskite-Type Structure

1977 ◽  
Vol 81 (1) ◽  
pp. 287-293 ◽  
Author(s):  
A. A. Antipin ◽  
A. V. Vinokurov ◽  
M. P. Davydova ◽  
S. L. Korableva ◽  
A. L. Stolov ◽  
...  
Keyword(s):  
Lattice Relaxation ◽  
Optical Spectra ◽  
Type Structure ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Perovskite Type ◽  
Perovskite Type Structure

Thermoelectric Oxides and Oxynitrides with Perovskite-type Structure

2007 ◽  
Vol 1044 ◽  
Author(s):  
Anke Weidenkaff ◽  
Laura Bocher ◽  
Rosa Robert ◽  
Myriam Aguirre ◽  
Dmitry Logvinovich
Keyword(s):  
Transition Metal Oxides ◽  
Lattice Thermal Conductivity ◽  
Complex Oxide ◽  
Type Structure ◽  
Soft Chemistry ◽  
Large Power ◽  
Thermoelectric Oxides ◽  
Synthesis Routes ◽  
Perovskite Type ◽  
Perovskite Type Structure

AbstractTransition metal oxides and oxynitrides with perovskite-type structures are potential high temperature stable thermoelectric materials. With innovative soft chemistry synthesis procedures the crystallite size in complex oxide ceramics with perovskite-type structure can be decreased compared to classical synthesis routes and allows to lower the heat conductivity dramatically while a large power factor can be maintained at the same time. Submicron crystallites are beneficial to lower the lattice thermal conductivity without influencing the electron mobility.In this work, perovskite-type cobaltates, molybdates and manganates are studied. The influence of heterostructures and nanocrystalline domains in perovskite oxides/oxynitrides and the correlation with transport properties and Seebeck coefficient will be discussed.

Synthesis and physical properties of new high temperature seignettomagnetics in the systems with perovskite type structure

1997 ◽  
Vol 204 (1) ◽  
pp. 345-355 ◽  
Author(s):  
V. V. Gagulin ◽  
S. K. Korchagina ◽  
Yu. A. Shevchuk ◽  
N. V. Fadeeva ◽  
V. V. Bogatko
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Type Structure ◽  
Perovskite Type ◽  
Perovskite Type Structure

Local environment of 119Sn4+ probe ions in the bulk and on the surfaces of substituted chromites with perovskite-type structure Y1–x Ca x CrO3

2015 ◽  
Vol 79 (8) ◽  
pp. 1046-1050 ◽  
Author(s):  
P. B. Fabrichnyi ◽  
M. I. Afanasov ◽  
E. M. Mezhuev ◽  
A. Wattiaux ◽  
C. Labrugère ◽  
...  
Keyword(s):  
Local Environment ◽  
Type Structure ◽  
Perovskite Type ◽  
Perovskite Type Structure
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