Cation size-temperature phase diagram of the manganites Ln{sub 0.5}Sr{sub 0.5}MnO{sub 3}

Journal Article · Sat Feb 01 00:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.363873· OSTI ID:450236

Damay, F; Maignan, A; Martin, C; Raveau, B ^[1]

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1. Laboratoire CRISMAT, ISMRA et Universite de Caen, URA 1318 associee au CNRS Bd du Marechal Juin, 14050 Caen Cedex (France)

We have studied the variation of the paramagnetic to ferromagnetic transition temperature T{sub C} and of the ferromagnetic to antiferromagnetic transition temperature T{sub N} as a function of the average size of the A site cations (Ln, Sr) in the manganite perovskites Ln{sub 0.5}Sr{sub 0.5}MnO{sub 3} (Ln=Gd, Sm, Y, Pr, La). For our investigation we used dc resistivity, magnetization, susceptibility and magnetoresistance measurements. Results show that the Curie temperature T{sub C} increases from 85 to 310 K when {l_angle}r{sub A}{r_angle} varies from 1.221 to 1.263 {Angstrom}, whereas T{sub N} remains stable around 150 K. A magnetic phase diagram temperature-{l_angle}r{sub A}{r_angle} has been established, allowing five regions with different magnetic behaviours to be evidenced: paramagnetic insulating, ferromagnetic metallic, antiferromagnetic insulating, canted antiferromagnetic metallic, and weak ferromagnetic insulating. The extension of these regions is determined by the value of the applied magnetic field. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 450236
• Journal Information: Journal of Applied Physics, Vol. 81, Issue 3; Other Information: PBD: Feb 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GADOLINIUM OXIDES
PHASE DIAGRAMS
SAMARIUM OXIDES
YTTRIUM OXIDES
PRASEODYMIUM OXIDES
LANTHANUM OXIDES
STRONTIUM OXIDES
MANGANESE OXIDES
CURIE POINT
NEEL TEMPERATURE
ELECTRIC CONDUCTIVITY
PHASE TRANSFORMATIONS
CATIONS
MAGNETIZATION
MAGNETIC SUSCEPTIBILITY
MAGNETORESISTANCE
TEMPERATURE DEPENDENCE
FERROMAGNETISM