Magnetic order in
| Autor: | R. Cywinski, C Ritter, M R Crook, B. R. Coles |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | Journal of Physics: Condensed Matter. 8:7785-7796 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/0953-8984/8/41/022 |
| Popis: | Neutron powder diffraction has been used to study the evolution of magnetic order with increasing Zr substitution in the C14 Laves phase compounds . For compounds with x = 0.3 and x = 0.4 we find a simple antiferromagnetic structure, similar to that reported for isostructural . In this structure the Fe moments at the 6h sites are aligned along the c-axis, ferromagnetically coupled within the a - b plane, with adjacent planes antiferromagnetically coupled. This spin structure results in a cancellation of the molecular field at the interplanar 2a sites, and the Fe atoms at these sites carry no ordered moment. The neutron diffraction measurements on compounds in the composition range provide evidence of a low-temperature spin-canted structure in which the antiferromagnetic structure described above is modified by the appearance of a basal-plane ferromagnetic component which in turn leads to a small ordered Fe moment at the 2a site. The temperature dependence of the staggered magnetization in the antiferromagnetic state of the x = 0.4 compounds is found to closely follow the form , as predicted for weak itinerant antiferromagnets by SCR spin-fluctuation theory. |
| Databáze: | OpenAIRE |
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