Heat transport inSb2−xVxTe3single crystals

J. S. Dyck, W. Chen, C. Uher, Č. Drašar, P. Lošt'ák
2002 Physical Review B (Condensed Matter)  
Antimony telluride doped with small concentrations of vanadium was recently identified as a diluted magnetic semiconductor. We present a study of the heat transport in single crystals of Sb 2Ϫx V x Te 3 with xϭ0, 0.01, 0.02, and 0.03. Thermopower and thermal conductivity were measured from 1.5 K to 300 K. The thermopower is positive for all samples investigated and has a modest dependence on vanadium content. At low temperatures, the lattice thermal conductivity has an approximate T 2
more » ... and the data up to 100 K can be fitted well assuming that phonons scatter on boundaries, point defects, charge carriers, and other phonons. Theoretical analysis reveals that the over-riding effect of vanadium impurity is the formation of point defects that suppress heat transport via both mass and elastic strain fluctuations.
doi:10.1103/physrevb.66.125206 fatcat:44mrjq6bk5cx3mweflxgpbgk4y