Electronic topological transitions, magnetic ordering and the Fermi surfaces of Y and the heavy rare earths
UNSPECIFIED. (2004) Electronic topological transitions, magnetic ordering and the Fermi surfaces of Y and the heavy rare earths. EUROPHYSICS LETTERS, 65 (2). pp. 235-241. ISSN 0295-5075Full text not available from this repository.
Official URL: http://dx.doi.org/10.1209/epl/i2003-10076-4
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 Gd1-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.
|Item Type:||Journal Article|
|Subjects:||Q Science > QC Physics|
|Journal or Publication Title:||EUROPHYSICS LETTERS|
|Publisher:||E D P SCIENCES|
|Official Date:||January 2004|
|Number of Pages:||7|
|Page Range:||pp. 235-241|
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