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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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Ä«Ïã(½ð±Ò+2, ·­ÒëEPI+1):лл²ÎÓë 2010-04-21 16:59
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[ Last edited by lxuyan on 2010-4-20 at 18:38 ]
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ÓÈÆäÕâ¾ä£ºA 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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Ä«Ïã(½ð±Ò+3):THX 2010-04-23 14:49
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