Neutron and magnetization study of La sub 1. 8 Sr sub 0. 2 NiO sub 4

Journal Article · Mon Apr 15 04:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.348207· OSTI ID:5616645

Lander, G H ^[1]; Brown, P J ^[2]; Stassis, C ^[3]; Gopalan, P; Spalek, J; Honig, G ^[4]

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1. Commission of European Communities, Joint Research Centre, Postfach 2340, D-7500 Karlsruhe, Federal Republic of Germany (DE)
2. Institut Laue-Langevin, 156 X, 38042 Grenoble, (France)
3. Physics Dept. and Ames Laboratory, Iowa State University, Ames, Iowa 50011 (USA)
4. Department of Physics and Chemistry, Purdue University, Lafayette, Indiana 47907 (USA)

Magnetization and neutron-diffraction experiments with both polarized and unpolarized neutrons have been performed on single crystals of La{sub 1.8}Sr{sub 0.2}NiO{sub 4}. The susceptibility is highly anisotropic at low temperature, {chi}{sub {ital ab}} (field applied perpendicular to long axis) showing a peak at {similar to}18 K. However, no evidence has been found for long-range magnetic order. It is speculated that the low-temperature state is a spin glass, with 18 K being the freezing temperature. Polarized neutron diffraction has been used to measure the induced magnetization density in a field of 4.6 T and at 20 K. The results can be understood by using an expanded Ni{sup 2+} form factor and invoking a small positive susceptibility at the La site. There is also evidence for covalency between the Ni and O(2) atoms along the {ital c} axis. The material distorts from tetragonal ({ital I}4/{ital mmm}) to orthorhombic ({ital Bmab}) at 120{plus minus}5 K. The structural parameters are similar to those of La{sub 2}NiO{sub 4}.

• OSTI ID: 5616645
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:8; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

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360603* -- Materials-- Properties
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LANTHANUM NITRATES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
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