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We have found that AgBixSb1−xTe2 alloys exhibit D4 ordering of Ag vs £¨Bi,Sb£© cations and are fully miscible down to the room temperature. Generally, Ag1−x−yBixSbyTe2 alloys are miscible if constrained to the rocksalt lattice. Without such a constraint, nonrocksalt phases become thermodynamically stable at all compositions at sufficiently low temperatures. The band structures of AgSbTe2 and AgBiTe2 share many similarities; in particular, in both compounds the dispersion around the VBM is reasonably approximated by Eq. (1). However, stronger spin-orbit coupling in Bi-containing materials changes some band-structure features by up to ~1 eV, in particular, leading to a different absorption edge for direct optical transitions and a second gap at * +1.3 eV seen in AgBiTe2 dispersion. The topology of the Fermi surface is sensitive to the hole doping. A detailed analysis of the experimental de Haas-van Alphen data based on the calculated band structure suggests the Fermi level in naturally doped samples is located around ** meV, not far from the value estimated in Ref. 20. |
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