Abstract
On the basis of ab initio calculations of the electronicstructure, an attempt is made to identify the reasons for thequalitatively different behaviours of long-period superstructures(LPS) with large and small superperiods 2M in alloys of noblemetals. To this end, analysis is performed of the relationshipbetween the nesting properties of the Fermi surface and thestructure of LPS (of relatively small 2M) formed in the Ag3Mgalloy. The results of the analysis are compared with those obtainedearlier for Cu-Au alloys (where LPS possess longer 2M). It isshown that the dependence of the type of LPS on the value of 2M iscontrolled by the quality of nesting on the Fermi surface and thesensitivity of the nesting vector 2k⃗F to variations in thelong-range order parameter.
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