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Publication Detail
Electronic topological transitions, magnetic ordering and the Fermi surfaces of Y and the heavy rare earths
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Crowe SJ, Dugdale SB, Major Z, Alam MA, Duffy JA, Palmer SB
  • Publication date:
  • Pagination:
    235, 241
  • Journal:
    Europhysics Letters
  • Volume:
  • Issue:
  • Status:
  • Print ISSN:
The magnetic order of the heavy rare earths has long been associated with the presence of a certain feature in the Fermi surface (FS) topology (being common to non-magnetic Y also), known as the "webbing". Furthermore, there has been speculation that changes in the observed ordering, brought about by temperature-induced changes in the crystalline c/a ratio, are due to the presence or absence of that webbing feature. Such a simplistic model is appealingly simple in systems where physics of the exchange interaction as a function of composition and temperature is complicated. The Gd 1-xYx. alloy system exhibits ferromagnetism or helical antiferromagnetism at different compositions and temperatures. We present our experimental measurement of the FS topology of such an alloy at a composition close to the Y concentration where helical antiferromagnetism occurs. The data show that the evolution of the FS in Gd1-xYx is different from that predicted by the model based on the c/a ratio, suggesting a less simplistic interpretation.
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