S-Wave Superconductivity in the Dirac Line-Nodal Material CaSb₂

• Takahashi, Hidemitsu

• Kitagawa, Shunsaku

• Ishida, Kenji

• Kawaguchi, Mayo

• Ikeda, Atsutoshi

• Yonezawa, Shingo

• Maeno, Yoshiteru

Bibliographic Information

Other Title

• <i>S</i>-Wave Superconductivity in the Dirac Line-Nodal Material CaSb₂

Abstract

We performed Sb ¹²¹/¹²³nuclear quadrupole resonance (NQR) measurements on the superconducting (SC) line-nodal material CaSb₂ in order to investigate electronic properties in the normal and SC states from a microscopic point of view. In the normal state, the nuclear spin-lattice relaxation rate 1/T₁ for the Sb(1) site, which is responsible for the line-nodal parts, is approximately proportional to temperature, indicating the conventional Fermi liquid state. From comparison with band structure calculations, it is considered that the NQR properties related to the line-nodal character are hidden because the conventional behavior originating from Fermi-surface parts away from the nodes is dominant. In the SC state, a clear coherence peak just below the transition temperature and an exponential decrease at lower temperatures were observed in 1/T₁. These results strongly suggest that conventional s-wave superconductivity with a full gap is realized in CaSb₂.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 90 (7), 073702-, 2021-07

  Physical Society of Japan

Keywords

• General Physics and Astronomy

Details

• CRID: 1050293943124233216
• NII Article ID: 40022619555
• NII Book ID: AA00704814
• DOI: 10.7566/jpsj.90.073702
• ISSN: 13474073
• ISSN: 00319015
• HANDLE: 2433/276909
• NDL BIB ID: 031558213
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I031558213
• Web Site: https://journals.jps.jp/doi/pdf/10.7566/JPSJ.90.073702
• Text Lang: en
• Article Type: journal article
• Data Source:
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  • NDL
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  • CiNii Articles
  • KAKEN