Superconducting and structural properties of the type-I superconductor PdTe2 under high pressure

Yusaku Furue, Tadachika Fujino, Marc V. Salis, Huaqian Leng, Fumihiro Ishikawa, Takashi Naka, Satoshi Nakano, Yingkai Huang, Anne de Visser, and Ayako Ohmura
Phys. Rev. B 104, 144510 – Published 25 October 2021
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Abstract

The transition metal dichalcogenide PdTe2 has attractive features based on its classification as a type-II Dirac semimetal and the occurrence of type-I superconductivity, providing a platform for discussion of a topological superconductor. Our recent work revealed that type-I superconductivity persists up to pressures of 2.5 GPa and the superconducting transition temperature Tc reaches a maximum at around 1 GPa, which is inconsistent with the theoretical prediction. To understand its nonmonotonic variation and investigate superconductivity at higher pressures, we performed structural analysis by x-ray diffraction at room temperature below 8 GPa and electrical resistivity measurements at low temperatures from 1 to 8 GPa. With regard to the superconductivity beyond 1 GPa, the monotonic decrease in Tc is reproduced without any noticeable anomalies; Tc changes from 1.8 K at 1 GPa to 0.82 K at 5.5 GPa with dTc/dP0.22 K/GPa. The crystal structure with space group P3¯m1 is stable in the pressure range we examined. On the other hand, the normalized pressure-strain analysis (finite strain analysis) indicates that the compressibility changes around 1 GPa, suggesting that a Lifshitz transition occurs. We here discuss the effect of pressure on the superconducting and structural properties based on the comparison of these experimental results.

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  • Received 11 August 2021
  • Accepted 4 October 2021

DOI:https://doi.org/10.1103/PhysRevB.104.144510

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yusaku Furue1, Tadachika Fujino2, Marc V. Salis3, Huaqian Leng3,4, Fumihiro Ishikawa2, Takashi Naka5, Satoshi Nakano5, Yingkai Huang3, Anne de Visser3, and Ayako Ohmura2,*

  • 1Graduate School of Science and Technology, Niigata University, 8050, Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2181, Japan
  • 2Faculty of Science, Niigata University, 8050, Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2181, Japan
  • 3Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
  • 4School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China
  • 5National Institute for Materials Science (NIMS), Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan

  • *ohmura@phys.sc.niigata-u.ac.jp

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Issue

Vol. 104, Iss. 14 — 1 October 2021

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