Magnon Drag Effect on Resistivity and Thermoelectric Power of Semimetallic Antiferromagnet USb
Z. Henkie and P. Wiśniewski
W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, 50-950 Wrocław 2, Poland
Received: August 23, 1994; revised version: June 19, 1995
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Resistivity ρ(T) and absolute thermoelectric power S(Τ) have been measured for USb single crystals characterized by different residual resis­tivity ratios, RRR = ρ(300 K)/ρ(4.2 K). A 50 μV/K peak of S(Τ) observed at 40 K for high RRR crystal vanishes for low RRR one. The ρ ∝ Τ4 depen­dence observed below 40 K changes to the ρ ∝ Τ5/2 one. These variations are ascribed to reduction of the magnon drag effect by an increased inco­herent magnetic scattering of carriers, possibly induced by a small change of composition. Resistivity anomaly is analysed above the antiferromagnetic transition temperature TN. We have found that resistivity decreases as tlnt in the range 0.02 ≤ t ≤ 0.35, where t = (Τ - TN)/TN. It is ascribed to a semimetallic character of this compound.
DOI: 10.12693/APhysPolA.88.1103
PACS numbers: 72.20.Pa, 72.15.Jf, 72.15.Eb, 75.50.Ee