Magnetic Structure Investigations at the Nuclear Center
The magnetic structure of the compounds UOS, -CoSO 4, YCo 5, and HoCo 5 is briefly described. UOS is antiferromagnetic. The Néel temperature is T n=55°K. The magnetic cell is doubled in the c direction with a ++ - sequence of U moments along c. The apparent spin is S∼1. The negative interaction corresponds to U-O-U links. In -CoSO 4 (high-temperature modification, space group Pbnm), Co atoms are in 000, 00, , 0. Here three different antiferromagnetic spin modes, mutually perpendicular, A x(+ - +), G y(+-+-), and C z(++ - ), in the Wollan-Koehler notation, are coupled. Direction cosines are 0.71, 0.50, and 0.50, respectively. The Co moment is about 3,84 B at 4.2°K. A field-induced spin flip to the configuration F x, C y, G z is predicted. YCO 5 is ferromagnetic at room temperature with a moment value of Co practically equal to that of metallic Co and moment direction along c, which is conserved down to 4.2°K. In HoCo 5 the moment of Ho is opposite to those of the Co atoms. When cooling from room to liquid helium temperature, the direction of easy magnetization changes from near c to a direction in the basal plane and the Ho moment increases from 4 to about 9 B. The compensation temperature is 70°K. © 1963 The American Institute of Physics.
R. Ballestracci et al., "Magnetic Structure Investigations at the Nuclear Center," Journal of Applied Physics, American Institute of Physics (AIP), Jan 1963.
The definitive version is available at http://dx.doi.org/10.1063/1.1729495
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© 1963 American Institute of Physics (AIP), All rights reserved.