Cocktail Effects in Superconductivity: High-Entropy Approach to Antimonide Compounds

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• Professor Daigorou Hirai, Nagoya University
• Tuesday 06 May 2025, 14:00-15:00
• RDC Seminar East.

If you have a question about this talk, please contact Mads Fonager Hansen.

High-entropy compounds, stabilized by configurational entropy, have attracted considerable attention due to their unique properties and functionalities [1-3]. In this study, we applied the high-entropy concept to antimonide systems and discovered an entropy-stabilized antimonide compound with a NiAs-type structure [4]. Specifically, we investigated the superconducting properties of (RuRhPdIr)₁₋ₓPtₓSb and found that the superconducting transition temperature (Tc) and upper critical field (Hc₂) exhibit strong composition dependence [5]. A maximum Tc of 3.1 K and a significant enhancement in Hc₂ were observed at intermediate compositions, indicating a novel “cocktail effect” arising from chemical disorder. These results demonstrate the potential of entropy engineering in designing new superconducting materials.

[1] J. W. Yeh et al., Adv Eng Mater 6, 299 (2004).

[2] B. Cantor et al., Materials Science and Engineering: A 375 –377, 213 (2004).

[3] C. M. Rost etal., Nat. Commun. 6, 8485 (2015).

[4] D. Hirai et al., Inorg. Chem. 62, 14207 (2023).

[5] D. Hirai et al., Chem. Mater. 36, 9547 (2024).

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