标题： 压力诱导的CuIr2S4中的18.2 K超导性 显示英文标题

标题： Pressure-Induced Superconductivity at 18.2 K in CuIr2S4

摘要： 获得超过目前在尖晶石化合物AB2X4（A、B=过渡金属，X=氧/类金属）中观察到的约14 K的超导临界温度（Tc），可以阐明相互作用的复杂性并指导材料设计。这项工作聚焦于CuIr2S4，它在230 K以下表现出独特的金属-绝缘体转变，是高压下激活的非常规候选材料。通过在高达224 GPa的压力下进行输运、衍射和光谱实验，我们揭示了压力调节抑制了CuIr2S4的转变，产生了两个超导相，其Tc超过了尖晶石的前所未有的水平。最初，3.8 K的开始温度单调上升，在133 GPa时达到18.2 K。令人意外的是，在更高压力下出现了一个Tc=2.2 K的不同相，暗示了非常规耦合。我们的发现表明，几何阻挫和电子-电子相互作用在CuIr2S4中观察到的超导性中起着关键作用。这些发现拓展了尖晶石中的温度极限，并提供了结构-性能见解，以指导量子材料相互作用的优化，实现定制的目标功能。 显示英文摘要

摘要： Attaining superconducting critical temperatures (Tc) beyond the limit around 14 K observed thus far in spinel compounds AB2X4 (A, B = transition metals, X = O/chalcogen) could elucidate interaction intricacies and inform materials design. This work spotlights CuIr2S4, which exhibits a distinct metal-insulator transition below 230 K, as an unconventional candidate for activation under high pressure. Through transport, diffraction, and spectroscopy experiments conducted at pressures up to 224 GPa, we unveil pressure-tuning that suppressed CuIr2S4's transition, yielding two superconducting phases with an un-precedented Tc for spinels. Initially, 3.8 K onset rose monotonically, reaching 18.2 K at 133 GPa. Unexpectedly, a distinct phase with Tc = 2.2 K distinctly emerged at higher pressures, intimating unconventional couplings. Our findings suggest that both geometric frustration and electron-electron interactions play crucial roles in the superconductivity observed in CuIr2S4. The findings stretch perceived temperature limits in spinels and provide structure-property insights to guide the optimiza-tion of quantum materials interactions for tailored targeted functionalities.