Superconductivity in the nonsymmorphic line-nodal compound CaSb<sub>2</sub>
ORAL
Abstract
We found superconductivity in CaSb2 with the transition onset of 1.8 K by means of electrical-resistivity, magnetic-susceptibility, and specific-heat measurements [1]. Zero resistance was observed below 1.2 K, and the superconducting volume fraction at 0 K was estimated to be 65% from specific heat. This material crystallizes in a nonsymmorphic structure and is predicted to have multiple Dirac nodal lines in the bulk electronic band structure protected by crystalline symmetry even in the presence of spin-orbit coupling. In this presentation, we will briefly introduce the band structure of CaSb2 and then show experimental results evidencing its bulk superconductivity.
[1] A. Ikeda et al., Phys. Rev. Mater. 4, 041801(R) (2020).
[1] A. Ikeda et al., Phys. Rev. Mater. 4, 041801(R) (2020).
*This work was partially supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grants No. JP15H05851, JP15H05852, JP15H05855, JP15K21717, JP20H00130, JP17H02922, JP17H04848, JP19K14657, JP19H04696, and JP17J07577, and by the JSPS Core-to-Core Program (A. Advanced Research Network), as well as by Izumi Science and Technology Foundation (Grant No. H28-J-146). A. Ikeda is supported by the JSPS Research Fellowship.
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Presenters
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Atsutoshi Ikeda
- Kyoto Univ