Superconductivity above 180 K in Ca-Mg Ternary Superhydrides at Megabar Pressures

Autor:	Cai, Weizhao, Minkov, Vasily S., Sun, Ying, Kong, Panpan, Sawchuk, Krista, Maiorov, Boris, Balakirev, Fedor F., Chariton, Stella, Prakapenka, Vitali B., Ma, Yanming, Eremets, Mikhail I.
Rok vydání:	2023
Předmět:	Condensed Matter - Superconductivity
Druh dokumentu:	Working Paper
Popis:	The discovery of high-temperature superconductivity above 240 K in binary La-H and Y-H systems inspired further predictions of even higher transition temperatures in compounds such as YH10 and MgH6, which are likely to be dynamically unstable. Ternary superhydrides provide alternative pathways to stabilize desired near-room temperature superconducting phases. However, the synthesis of new ternary hydrides remains challenging because most of the precursor reactants do not exist in desired stoichiometry at ambient conditions. Here we report that using the existing binary intermetallic CaMg2 and 1:1 Ca-Mg mixture as starting reactants, we have successfully synthesized novel Ca-Mg-based ternary superhydrides at megabar pressures. Electrical resistivity measurements show Tc approaching 168 K at 310 GPa in the CaMg2-based superhydride and 182 K in 1:1 the Ca-Mg superhydride at 324 GPa. Comment: 18 pages, four figures, 1 table
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2312.06090 Zobrazit plný text záznamu View this record from Arxiv