paper

Pressure-induced superconductivity in flat-band Kagome compounds Pd $_{3}$ P $_{2}$ (S $_{1 - x}$ Se $_{x}$ ) $_{8}$

arXiv:2203.15957 · doi:10.1088/0256-307X/39/6/067404

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 $T_{C}$ 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 $T_{C}$ 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.

6 pages, 5 figures

Pressure-induced superconductivity in flat-band Kagome compounds Pd3​P2​(S1−x​Sex​)8​

Abstract

Pressure-induced superconductivity in flat-band Kagome compounds Pd $_{3}$ P $_{2}$ (S $_{1 - x}$ Se $_{x}$ ) $_{8}$