论文标题
在中等压力下在LA-CE-H系统中实现的超导临界温度的增强
Enhancement of the superconducting critical temperature realized in the La-Ce-H system at moderate pressures
论文作者
论文摘要
在压力下寻找高温超导体的两个主要营地已成为两个主要营地。它们被认为是探索三元或多个氢化物的重要平台，以进一步增加TC或降低稳定压力。在这项工作中，我们通过在氨基氨基氨基中成功合成了95-130 GPA的三元六角六角形LA-CE多氢氢氢氢盐稳定在95-130 GPA的压力范围内（初始比率LA：CE = 2.5-3.5）。 176 K处的超导率明显地保留到约100 GPA。在100 GPa时，推断的上临界场HC2（0）达到216 t，这是合成的多氢化物中最高值。我们还进行了对比度实验，并在78 GPA时用TC-103 K稳定了二元高温超导LAHX。在95-130 GPA的压力范围内，三元六角LA-CE-H系统的TC高于二进制LA-H系统，最大差为100 K，并且在相同的压力和温度条件下合成了两个系统的化合物。这些结果清楚地表明，发现的LA-CE-H系统不仅富含高温超导氢化物，而且还可以在中等压力下实现高-TC。
Covalent and ionic polyhydrides have become the two main camps in searching for the high-temperature superconductors under pressure. They have been considered as important platforms for exploring ternary or multiple hydrides in order to further increase the Tc or decrease the stabilization pressure. In this work, we successfully synthesized ternary hexagonal La-Ce polyhydrides stable in the pressure range of 95-130 GPa by laser-heating the La-Ce alloy (initial ratio La:Ce=2.5-3.5) in ammonia borane. Superconductivity at 176 K was strikingly preserved to about 100 GPa. The extrapolated upper critical field Hc2(0) reached 216 T at 100 GPa, the highest value among the synthesized polyhydrides. We also performed the contrast experiments and stabilized binary high-temperature superconducting LaHx with Tc-103 K at 78 GPa. In the pressure range of 95-130 GPa, the ternary hexagonal La-Ce-H system exhibits higher Tc than the binary La-H system, with the maximum difference of 100 K, and the compounds of both systems were synthesized at the same pressure and temperature conditions. These results clearly indicate that the discovered La-Ce-H system not only enriches the high-temperature superconducting hydrides but also realizes high-Tc at moderate pressures.
