Superconducting and structural properties of the type-I superconductor PdTe2 under high pressure
| Autor: | H. Leng, Takashi Naka, Fumihiro Ishikawa, Ayako Ohmura, Anne de Visser, Tadachika Fujino, M. V. Salis, Satoshi Nakano, Yusaku Furue, Yingkai Huang |
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| Přispěvatelé: | Hard Condensed Matter (WZI, IoP, FNWI), WZI (IoP, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Superconductivity
Diffraction Materials science Condensed matter physics Condensed Matter - Superconductivity Type-I superconductor FOS: Physical sciences Crystal structure Space (mathematics) Semimetal Superconductivity (cond-mat.supr-con) Condensed Matter::Materials Science Transition metal Electrical resistivity and conductivity Condensed Matter::Superconductivity |
| Zdroj: | Physical Review B, 104(14):144510. American Institute of Physics |
| ISSN: | 2469-9969 1098-0121 2469-9950 |
| Popis: | The transition metal dichalcogenide $\mathrm{Pd}{\mathrm{Te}}_{2}$ 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 $\ensuremath{\sim}2.5$ GPa and the superconducting transition temperature ${T}_{\mathrm{c}}$ 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 ${T}_{\mathrm{c}}$ is reproduced without any noticeable anomalies; ${T}_{\mathrm{c}}$ changes from 1.8 K at 1 GPa to 0.82 K at 5.5 GPa with $d{T}_{\mathrm{c}}/dP\ensuremath{\sim}\ensuremath{-}0.22$ K/GPa. The crystal structure with space group $P\overline{3}m1$ 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. |
| Databáze: | OpenAIRE |
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