| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Pressure-Induced Superconductivity in Flat-Band Kagome Compounds Pd$_3$P$_2$(S$_{1-x}$Se$_x$)$_8$ |
| Shuo Li1,2†, Shuo Han2†, Shaohua Yan2†, Yi Cui2, Le Wang2, Shanmin Wang3, Shanshan Chen2, Hechang Lei2*, Feng Yuan4*, Jinshan Zhang1*, and Weiqiang Yu2* |
1Mathematics and Physics Department, North China Electric Power University, Beijing 102206, China
2Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
3Department of Physics, Southern University of Science & Technology, Shenzhen 518055, China
4College of Physics, Qingdao University, Qingdao 266071, China
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| Cite this article: |
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Shuo Li, Shuo Han, Shaohua Yan et al 2022 Chin. Phys. Lett. 39 067404 |
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Abstract We performed high-pressure transport studies on the flat-band Kagome compounds, Pd$_3$P$_2$(S$_{1-x}$Se$_x$)$_8$ ($x=0$, 0.25), with a diamond anvil cell. For both compounds, the resistivity exhibits an insulating behavior with pressure up to 17 GPa. With pressure above 20 GPa, a metallic behavior is observed at high temperatures in Pd$_3$P$_2$S$_8$, and superconductivity emerges at low temperatures. The onset temperature of superconducting transition $T_{\rm C}$ rises monotonically from 2 K to 4.8 K and does not saturate with pressure up to 43 GPa. For the Se-doped compound Pd$_3$P$_2$(S$_{0.75}$Se$_{0.25}$)$_8$, the $T_{\rm C}$ is about 1.5 K higher than that of the undoped one over the whole pressure range, and reaches 6.4 K at 43 GPa. The upper critical field with field applied along the $c$ axis at typical pressures is about 50$\%$ of the Pauli limit, suggesting a 3D superconductivity. The Hall coefficient in the metallic phase is low and exhibits a peaked behavior at about 30 K, which suggests either a multi-band electronic structure or an electron correlation effect in the system.
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Received: 29 March 2022
Editors' Suggestion
Published: 29 May 2022
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| PACS: |
74.70.-b
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(Superconducting materials other than cuprates)
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76.60.-k
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(Nuclear magnetic resonance and relaxation)
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