Normal and Superconducting Properties of the Noncentrosymmetric Mo

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概要

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• We have investigated the noncentrosymmetric superconductor Mo<inf>3</inf>Al<inf>2</inf>C prepared by spark plasma sintering, in which the amount of impurity phase was considerably reduced. Another phase transition in the normal state was clearly observed in the spark plasma sintered sample as an abrupt change in the ²⁷Al nuclear magnetic resonance (NMR) spectra and an anomaly in the electrical resistivity. In the transition, a partial gap opening on the Fermi surface is inferred from the decrease in the nuclear spin--lattice relaxation rate 1/T_{1} and the magnetic susceptibility \chi below 200 K. The simultaneous presence of two components in the NMR spectra and thermal hysteresis in \chi at {\sim}200 K indicates the first-order character of the transition. These results imply the formation of the charge-density wave state in Mo<inf>3</inf>Al<inf>2</inf>C. In the superconducting state, 1/T_{1} shows a peak just below T_{\text{c}} and decreases exponentially with temperature, in good agreement with that is expected for the s-wave superconductor.

• 2013-07-15

著者

• Kohara Takao

  Graduate School Of Material Science University Of Hyogo

• TABATA Yoshikazu

  Department of Earth and Space Science, Graduate School of Science, Osaka University

• Waki Takeshi

  Department Of Chemistry The Graduate School Of Science Kyoto University

• Maeda Yoshitaka

  Graduate School Of Pharmaceutical Sciences Kyoto University

• Nakamura Hiroyuki

  Department of Advanced Materials, University of Tokyo, Kashiwa, Chiba 277-8561

• Ueda Ko-ichi

  Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan

• Kohara Takao

  Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan

• KOYAMA Takehide

  Graduate School of Material Science, University of Hyogo

• Mito Takeshi

  Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan

• Yamazaki Tomoaki

  Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan

• Tsunemi Hiroshi

  Center for Atomic and Molecular Technologies, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan

• Ito Mikio

  Center for Atomic and Molecular Technologies, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan

• Maeda Yoshitaka

  Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan

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