Clegg, P S , Goff, J P , McIntyre, G J , Ward, R C C and Wells, M R (2003) Epitaxial Ce and the magnetism of single-crystal Ce/Nd superlattices. Physical Review B, 67 (17).
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The chemical structure of epitaxial gamma cerium and the chemical and magnetic structures of cerium/neodymium superlattices have been studied using x-ray and neutron diffraction techniques. The samples were grown using molecular-beam epitaxy, optimized to yield the desired Ce allotropes. The x-ray measurements show that, in the superlattices, both constituents adopt the dhcp structure and that the stacking sequence remains intact down to Tsimilar to2 K; these are the first measurements of magnetic ordering in single-crystal dhcp Ce. The magnetic structure of the superlattices with thicker Nd layers exhibit incommensurate order and ferromagnetism on separate sublattices in a similar manner to Nd under applied pressure. The sample with thickest Ce layers has a magnetic structure similar to bulk beta Ce, which has commensurate transverse modulation with a propagation wave vector [1/2 0 0] and moments along the hexagonal a direction. These two types of magnetic order appear to be mutually exclusive. gamma Ce is the high-temperature fcc phase of Ce, our single-phase epitaxial sample is observed to go through a new, but partial, structural transition not previously seen in the bulk material.
This is a Submitted version This version's date is: 1/5/2003 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/ba3ccefc-c555-e629-c528-2b3d832c7459/6/
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