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Resistivity, Hall effect, Seebeck coefficient, thermal conductivity, heatcapacity, and magnetic susceptibility data are reported for CrSb2 singlecrystals. In spite of some unusual features in electrical transport and Hallmeasurements below 100 K, only one phase transition is found in the temperaturerange from 2 to 750 K corresponding to long-range antiferromagnetic order belowT_N ~ 273 K. Many of the low temperature properties can be explained by thethermal depopulation of carriers from the conduction band into a low mobilityband located approximately 16 meV below the conduction band edge, as deducedfrom the Hall effect data. In analogy with what occurs in Ge, the low mobilityband is likely an impurity band. The Seebeck coefficient, S, is large andnegative for temperatures from 2 to 300 K ranging from ~ -70\muV/K at 300 K to-4500\muV/K at 18 K. A large maximum in |S| at 18 K is likely due to phonondrag with the abrupt drop in |S| below 18 K due to the thermal depopulation ofthe high mobility conduction band. The large thermal conductivity between 10and 20 K (~350 W/m/K) is consistent with this interpretation, as are detailedcalculations of the Seebeck coefficient made using the complete calculatedelectronic structure. These data are compared to data reported for FeSb2, whichcrystallizes in the same marcasite structure, and FeSi, another unusualnarrow-gap semiconductor.

Transport, Thermal, and Magnetic Properties of the Narrow-Gap Semiconductor CrSb2