Electric quadrupole interaction of111Cd in the system Sb1−xMx (M=Ag,Cd,In,Sn), Sb2Te3, Bi2Te3 and In2Te3

We have performed TDPAC-measurements to investigate the static quadrupole interaction of₁₁₁Cd in the classic semimetal Sb. The coupling constant depends on the concentration of small amounts of metal admixtures. The only exception is the system Sb_1–xAg_x. The temperature dependence of the efg in the narrow gap semiconductors Sb₂Te₃ and Bi₂Te₃ is similar to that one in Te. In contrast to these results the efg in the III–VI-semiconductor In₂Te₃ is temperature independent.