Synthesis, structures, and magnetic properties of novel Roddlesden-Popper homologous series Sr{sub n+1}Co{sub n}O{sub 3n+1} (n=1,2,3,4, and {infinity})

Journal Article · Sun May 15 00:00:00 EDT 2005 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.1855534· OSTI ID:20711673

Wang, X L; Sakurai, H; Takayama-Muromachi, E ^[1]

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1. Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2522, Australia and Superconducting Materials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)

Roddlesden-Popper homologous series Sr{sub n+1}Co{sub n}O{sub 3n+1} (n=1,2,3,4, and {infinity}) compounds were successfully synthesized by a high pressure and high temperature technique. Structure refinement revealed that these compounds crystallize in tetragonal structures, while the compound n={infinity} is cubic. These compounds are ferromagnetic with the Curie temperature decreasing from 255 K for n=1 to about 200 K for n=2-4 and down to 175 K for SrCoO{sub 3}. Co{sup 4+} ions present as intermediate spin states for n=1-4, but in the low spin state in SrCoO{sub 3}. Negative magnetoresistance was observed for Sr{sub 2}CoO{sub 4} and found to be larger than that for SrCoO{sub 3}.

• OSTI ID: 20711673
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 10 Vol. 97; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT COMPOUNDS
COBALT IONS
CURIE POINT
FERROMAGNETIC MATERIALS
HYSTERESIS
MAGNETIC PROPERTIES
MAGNETORESISTANCE
OXYGEN COMPOUNDS
PRESSURE DEPENDENCE
QUENCHING
SPIN
STRONTIUM COMPOUNDS
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K