Synthesis of medium-entropy alloy superhydride (La,Y,Ce)H10±x with high-temperature superconductivity under high pressure
Chuanheng Ma, Mi Zhou, Jingkai Bi, Yuan Ma, Dongdong Li, Hanyu Liu, Guangtao Liu, Hongbo Wang, Yanming Ma
DOI 10.1103/PhysRevB.111.024505 · Physical Review B
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Abstract
Metal substitutions have been recognized as an efficient approach for exploring unusual superhydrides, aiming to discover configurations with diverse structures and enhanced superconductivity. However, the roles of the metal type and concentration on high-temperature superconducting (high-Tc) hydrides with multiple components remain underexplored in this rapidly advancing domain. In this study, we conducted extensive experiments on the equimolar La-Ce-Y alloy superhydride with the highest configuration entropy among quaternary hydrides under pressure. In situ X-ray diffraction measurements revealed the synthesis of a hexagonal close-packed (hcp) P63/mmc-(La,Ce,Y)H10±x (−0.2<x<+0.4), which could be stable down to the lowest pressure of 96 GPa. Notably, despite numerous efforts, such an unprecedented hcp decahydride subunit has remained unattainable in corresponding binary hydrides, highlighting the powerful influence of the entropy effect on stability and hydrogen concentration in this multicomponent system. Further electrical transport measurements confirmed its superconductivity, as evidenced by zero resistance and suppression of superconductivity under applied magnetic fields, with a maximum Tc of 165 K. These findings serve as a paradigmatic example, investigating entropy effects in multinary systems and opening up the exciting potential for further exploration of high-Tc alloy superhydrides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (La,Ce,Y)H10±x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 165 | 125 GPa | onset |
| (La,Ce,Y)H10±x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 144 | 120 GPa | onset |
| (La,Ce,Y)H10±x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 147 | 118 GPa | onset |
| (La,Ce,Y)H10±x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 150 | 118 GPa | onset |
| (La,Ce,Y)H10±x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 145 | 136 GPa | onset |
| LaH10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 250 | Pressure not reported | unknown |
| Li2MgH16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 473 | 250 GPa | unknown |
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