Epitaxial Ce and the magnetism of single-crystal Ce/Nd superlattices

Paul Clegg, J P Goff, G J McIntyre, R C C Ward, M R Wells

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number174414
Pages (from-to)-
Number of pages11
JournalPhysical review B: Condensed matter and materials physics
Volume67
Issue number17
DOIs
Publication statusPublished - 1 May 2003

Keywords

  • RARE-EARTH SUPERLATTICES
  • LOCAL-DENSITY APPROXIMATION
  • MEAN-FIELD THEORY
  • ALLOY SYSTEM
  • NEODYMIUM
  • MULTILAYERS
  • PRESSURE
  • GROWTH
  • STATE
  • CE/FE

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