Effects of the A-site cation number on the properties of Ln{sub 5/8}M{sub 3/8}MnO{sub 3} manganites

Journal Article · Sat May 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.03.018· OSTI ID:21372594

Collado, J A ^[1]; Garcia-Munoz, J L ^[2]; Aranda, M A.G., ^[1]

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1. Departamento de Quimica Inorganica, Universidad de Malaga, 29071 Malaga (Spain)
2. Instituto de Ciencia de Materiales de Barcelona, CSIC, Campus de Bellaterra, 08193 Bellaterra, Barcelona (Spain)

The properties of manganites can be tuned by changing the doping level x in Ln{sub 1-x}M{sub x}MnO{sub 3}. A second mechanism allows tuning of magnetic and electronic properties, for fixed x values, by varying the average A-cation radius, <r{sub A}>. Moreover, for fixed x and <r{sub A}> values, the changes in the A-cation size variance, sigma{sup 2}, also modify the ferromagnetic and metal-insulator transition temperatures. Here, we investigate the influence of the number of A-site cations on Ln{sub 5/8}M{sub 3/8}MnO{sub 3} manganites, where x, <r{sub A}> and sigma{sup 2} values are kept constant, and in the absence of phase separation phenomena. We have found that the number of cation species at the A site (N{sub A}) has a strong influence on the width of the ferromagnetic and metal-insulator transitions, and a small influence on the average transition temperature. This behavior is opposite to that observed for increasing values of the variance sigma{sup 2} in manganites, with the same x and <r{sub A}> values, where average transition temperatures are strongly reduced. - Graphical abstract: In this paper the influence of A-site cation number is shown, see attached schematic figure, on the magnetotransport properties of T{sub c}-optimized manganites, Ln{sub 5/8}M{sub 3/8}MnO{sub 3}.

• OSTI ID: 21372594
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 5; Other Information: DOI: 10.1016/j.jssc.2010.03.018; PII: S0022-4596(10)00096-4; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CALORIMETRY
CATIONS
MANGANESE COMPOUNDS
METALS
OXIDES
RARE EARTH COMPOUNDS
TRANSITION TEMPERATURE
CHALCOGENIDES
CHARGED PARTICLES
ELEMENTS
IONS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS