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Magnetisation and neutron diffraction experiments with both polarised and unpolarised neutrons have been performed on single crystals of La(1.8) Sr(0.2)NiO(4). The susceptibility is highly anisotropic at low temperature, the field applied perpendicular to the long axis showing a peak at about 18 K. However, no evidence is found for long-range magnetic order. It is suggested that the low-temperature state is a spin glass, with 18 K being the freezing temperature. Polarised-neutron diffraction has been used to measure the induced magnetisation density in a field of 4.6 T and at 20 K. The results can be understood by using an expanded Ni(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 c axis. The material distorts from tetragonal (I4/mmm) to orthorhombic (Bmab) at 120+/-5 K. The structural parameters are similar to those of La(2)Ni0(4).

Additional information

Authors: LANDER G H, JRC Karlsruhe (DE);BROWN P J, Institut Laue-Langevin, Grenoble (FR);STASSIS C, Iowa State University (US);GOPALAN P ET AL., Purdue University, Department of Physics and Chemistry, Lafayette (US)
Bibliographic Reference: Paper presented: 35th Annual Conference on Magnetism and Magnetic Materials, San Diego (US), Oct. 29 - Nov. 1, 1990
Availability: Available from (1) as Paper EN 35615 ORA
Record Number: 199011596 / Last updated on: 1994-12-02
Original language: en
Available languages: en