Normal and Superconducting Properties of the Noncentrosymmetric Mo3Al2C

被引：9

作者：

Koyama, Takehide ^{[1
]}

Maeda, Yoshitaka ^{[1
]}

Yamazaki, Tomoaki ^{[1
]}

Ueda, Ko-ichi ^{[1
]}

Mito, Takeshi ^{[1
]}

Kohara, Takao ^{[1
]}

Waki, Takeshi ^{[2
]}

Tabata, Yoshikazu ^{[2
]}

Tsunemi, Hiroshi ^{[3
]}

Ito, Mikio ^{[3
]}

Nakamura, Hiroyuki ^{[2
]}

机构：

[1] Univ Hyogo, Grad Sch Mat Sci, Kamigori, Hyogo 6781297, Japan

[2] Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, Japan

[3] Osaka Univ, Grad Sch Engn, Ctr Atom & Mol Technol, Suita, Osaka 5650871, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2013年 / 82卷 / 07期

关键词：

noncentrosymmetric superconductor; NMR; Mo3Al2C;

D O I：

10.7566/JPSJ.82.073709

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have investigated the noncentrosymmetric superconductor Mo3Al2C 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 Al-27 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 similar to 200K indicates the first-order character of the transition. These results imply the formation of the charge-density wave state in Mo3Al2C. In the superconducting state, 1/T-1 shows a peak just below T-c and decreases exponentially with temperature, in good agreement with that is expected for the s-wave superconductor.

引用

页数：4

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