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 0295-5075

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Abstract

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
ISSN:	0295-5075
Date:	January 2004
Volume:	65
Number:	2
Number of Pages:	7
Page Range:	pp. 235-241
Identification Number:	10.1209/epl/i2003-10076-4
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/8800

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