Transport properties and magnetoresistance in CoNb1−xMnxSb half-Heusler alloys with a low temperature localization |
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Authors: | Shandong Li,Meimei Liu,Zhonglin Lu,Liya Lü ,Youwei Du |
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Affiliation: | a Department of Physics, Fujian Normal University, Fuzhou 350007, China b National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing 210093, China |
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Abstract: | The transport properties and magnetoresistance of half-Heusler CoNb1−xMnxSb (x=0.0-1.0) alloys have been investigated between 2 and 300 K. In this temperature range, a metallic conductivity has been observed for the alloys with higher (x=1.0) and lower (x=0.0-0.2) Mn contents. However, the middle Mn content alloys (x=0.4-0.8) exhibit non-metallic conductive behavior. Their temperature dependence of resistivity undergoes a Mott localization law ρ=ρ0exp(T0/T)p (p=1/4) rather than a thermal excitation regime ρ=ρ0exp(Ea/kT) at low temperature (). The localization can be attributed to atomic and magnetic disorder. Resistivity peaks from 25 to 300 K were also observed for these alloys. Magnetotransport investigation reveals that these resistivity peaks result from localization effect as well as spin-disorder scattering. |
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Keywords: | 72.15.Rn 73.43.Qt 75.47.-m 75.50.-y |
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