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 |