Magnetoresistance of 1T-Ta1-xTixS2 near the Metal-Nonmetal Transition at Ultra Low Temperatures

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  • Kobayashi Norio
    The Research Institute for Iron, Steel and Other Metals, Tohoku University
  • Sasaki Takako
    The Research Institute for Iron, Steel and Other Metals, Tohoku University
  • Muto Yoshio
    The Research Institute for Iron, Steel and Other Metals, Tohoku University

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タイトル別名
  • Magnetoresistance of 1T–Ta<SUB>1−<I>x</I></SUB>Ti<I><SUB>x</SUB></I>S<SUB>2</SUB> near the Metal-Nonmetal Transition at Ultra Low Temperatures
  • Magnetoresistance of 1T Ta1 xTixS2 near
  • Magnetoresistance of 1T–Ta<sub>1-<i>x</i></sub>Ti<sub><i>x</i></sub>S<sub>2</sub> near the Metal-Nonmetal Transition at Ultra Low Temperatures

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The temperature and magnetic field dependences of electrical resistivity of four 1T–Ta1−xTixS2 samples (x=0.01, 0.03, 0.07 and 0.09) were measured down to 20 mK and up to 90 kOe. In this system, a metal-nonmetal transition occurs at a concentration between x=0.03 and 0.07. In higher concentration samples (x=0.07 and 0.09), the electrical resistivity shows the temperature dependence due to the variable-range hopping in the Anderson localized states, while in lower ones (x=0.01 and 0.03) becomes metallic below 20 K, showing no temperature dependence below 1 K. The large positive magnetoresistance is observed in the temperature range between 10 and 0.1 K and the negative one is found below 0.1 K for higher concentration samples. The magnetoresistance of lower ones increases monotonically with decreasing temperature. These behaviors of the magnetoresistance are understood by the recent Yosida and Fukuyama model.

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