Synthesis and superconductivity in (La,Ca)H10 under high pressure

The discovery of binary lanthanum hydrides provides a platform for exploring ternary hydrides with excellent properties. Here, the authors synthesize two lanthanum-calcium hydrides with superconducting critical temperature (${T}_{c}$) of 247 and 230 K, respectively. The results show that Ca doping has a negligible effect on the ${T}_{c}$ of LaH${}_{10}$, but affects the stability of the structure, suggesting that Ca may not be an ideal dopant. This study will help the future search for room-temperature superconductors in more diverse hydride materials.