Tc Maximum in Solid Solution of Pyrite IrSe2-RhSe2 Induced by Destabilization of Anion Dimers
Jiangang Guo, Yanpeng Qi, Satoru Matsuishi, Hideo Hosono
TL;DR
This study reveals a dome-shaped superconducting transition temperature in Ir0.94-xRhxSe2, peaking at 9.6K due to destabilization of Se-Se dimers and electron transfer, highlighting the role of anion dimer dynamics.
Contribution
It demonstrates how destabilization of Se-Se dimers in Ir-Rh selenides enhances superconductivity, providing insights into tuning Tc via anion dimer manipulation.
Findings
Maximum Tc of 9.6K at x=0.36 in Ir0.94-xRhxSe2.
Se-Se dimer length correlates with Tc peak.
Destabilization of dimers linked to electron transfer and superconductivity emergence.
Abstract
We have established a well-defined dome shape Tc curve in Ir0.94-xRhxSe2 superconductors. The maximum Tconset of 9.6K was obtained at x=0.36, at which the Se-Se separation in the dimer anion is the longest. Simultaneously, the destabilization of Se-Se dimers accompanied by partial elec-tron-transfer from the Ir/Rh to the chalcogenide ions result-ed in the emergence of optimal Tc.
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