Crystal structures and magnetic properties of Ca{sub 2{minus}x}Sr{sub x}MnO{sub 4}
- Hokkaido Univ., Sapporo (Japan). Div. of Chemistry
- Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan)
The authors prepared Ruddlesden-Popper-type layered perovskites Ca{sub 2{minus}x}Sr{sub x}MnO{sub 4} (x = 0--2.0 at 0.25 intervals). Their precise crystal structures at room temperature and at 10 K were determined from both the X-ray and the neutron diffraction measurements. The compounds for x = 0 and 0.25 have a tetragonal system with the space group I4{sub 1}/acd (No. 142). The compounds for x = 0.5--2.0 have a tetragonal system with the space group I4/mmm (No. 139). Magnetic susceptibility measurements have been performed for all the compounds in the temperature range between 5 and 350 K. The temperature-dependent magnetic susceptibilities were measured under zero-field-cooled (ZFC) and field-cooled (FC) conditions at an applied field of 1000 G. A dramatic difference in magnetic susceptibilities between ZFC and FC was observed below the Neel temperatures for Ca{sub 2}MnO{sub 4} and Ca{sub 1.75}Sr{sub 0.25}MnO{sub 4}, which shows the onset of a ferromagnetic moment below these temperatures. This moment is caused by the Dzyaloshinsky-Moriya interaction. Magnetic structures of Ca{sub 2{minus}x}Sr{sub x}MnO{sub 4}(x = 0.0, 0.5, 1.0, and 1.5) solid solutions at 10 K have been determined by the neutron diffraction measurements. The nearest-neighbor Mn{sup 4+} ions are coupled antiferromagnetically in the (001) planes and the spins are parallel to the c axis.
- OSTI ID:
- 679250
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 145; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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