Pressure-induced anomalous enhancement in the superconducting critical temperature of the transition metal chalcogenides <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi mathvariant="normal">T</mi><msub><mi mathvariant="normal">a</mi><mn>2</mn></msub><mi>Pd</mi><msub><mi mathvariant="normal">S</mi><mn>6</mn></msub></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi mathvariant="normal">T</mi><msub><mi mathvariant="normal">a</mi><mn>2</mn></msub><mi>PdS</mi><msub><mi mathvariant="normal">e</mi><mn>6</mn></msub></mrow></math>

Ryo Matsumoto; Akitoshi Nakano; Takafumi D. Yamamoto; Kensei Terashima; Kazuki Yamane; Masahiro Ohkuma; Ichiro Terasaki; Yoshihiko Takano

doi:10.1103/cbw7-hg35

Pressure-induced anomalous enhancement in the superconducting critical temperature of the transition metal chalcogenides $T a_{2} Pd S_{6}$ and $T a_{2} PdS e_{6}$

Ryo Matsumoto ^1,*, Akitoshi Nakano², Takafumi D. Yamamoto ³, Kensei Terashima¹, Kazuki Yamane ^1,4, Masahiro Ohkuma ¹, Ichiro Terasaki ², and Yoshihiko Takano^1,4

¹Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
²Department of Physics, Nagoya University, Nagoya 464–8602, Japan
³Department of Materials Science and Technology, Tokyo University of Science, Tokyo 125–8585, Japan
⁴Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305–8577, Japan

^*Contact author: matsumoto.ryo@nims.go.jp

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Phys. Rev. B 112, 094502 – Published 2 September, 2025

DOI: https://doi.org/10.1103/cbw7-hg35

Abstract

The emergence of a second superconducting dome through pressure-induced crystal structure manipulation has garnered considerable interest. Transition-metal chalcogenides (TMCs) offer a promising platform, as several binary compounds in this category have shown the second dome. Recently, ternary TMCs like $T a_{2} Pd S_{6}$ and $T a_{2} PdS e_{6}$ have also demonstrated pressure-driven superconductivity. In this study, we conducted electrical transport measurements on $T a_{2} Pd S_{6}$ and $T a_{2} PdS e_{6}$ at ultrahigh pressures exceeding 100 GPa, extending previous research into unexplored pressure regions to investigate the second dome. In both materials, the superconducting critical temperature ( $T_{c}$ ) initially decreases with increasing pressure, but above 100 GPa, $T_{c}$ values significantly increase. Notably, $T a_{2} Pd S_{6}$ reaches a maximum $T_{c}$ of 11.2 K at 130.0 GPa—a high record for ternary TMCs. The anomalous enhancements of $T_{c} s$ in $T a_{2} Pd S_{6}$ and $T a_{2} PdS e_{6}$ suggest the possible existence of the second dome, and further consideration is required, such as the application of hydrostatic pressure.

Physical Review B

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Pressure-induced anomalous enhancement in the superconducting critical temperature of the transition metal chalcogenides $T a_{2} Pd S_{6}$ and $T a_{2} PdS e_{6}$

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Pressure-induced anomalous enhancement in the superconducting critical temperature of the transition metal chalcogenides Ta2PdS6 and Ta2PdSe6

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Pressure-induced anomalous enhancement in the superconducting critical temperature of the transition metal chalcogenides $T a_{2} Pd S_{6}$ and $T a_{2} PdS e_{6}$