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Superconductivity at 253 K in lanthanum–yttrium ternary hydrides
Materials Today ( IF 21.1 ) Pub Date : 2021-07-01 , DOI: 10.1016/j.mattod.2021.03.025
Dmitrii V. Semenok , Ivan A. Troyan , Anna G. Ivanova , Alexander G. Kvashnin , Ivan A. Kruglov , Michael Hanfland , Andrey V. Sadakov , Oleg A. Sobolevskiy , Kirill S. Pervakov , Igor S. Lyubutin , Konstantin V. Glazyrin , Nico Giordano , Denis N. Karimov , Alexander L. Vasiliev , Ryosuke Akashi , Vladimir M. Pudalov , Artem R. Oganov

Here we report the high-pressure synthesis of a series of lanthanum–yttrium ternary hydrides obtained at pressures of 170–196 GPa via the laser heating of P63/mmc La–Y alloys with ammonia borane. As a result, we discovered several novel compounds: cubic hexahydride (La,Y)H6 and decahydrides (La,Y)H10 with a maximum critical temperature TC ∼ 253 K and an extrapolated upper critical magnetic field BC2(0) of up to 135 T at 183 GPa. The current–voltage measurements show that the critical current density JC in (La,Y)H10 is 12–27.7 kA/mm2 at 4.2 K, which is comparable with that of commercial superconducting wires such as NbTi and Nb3Sn. (La,Y)H6 and (La,Y)H10 are among the first examples of ternary high-TC superconducting hydrides. Our experiments show that part of metal atoms in the structures of recently discovered Im3¯m-YH6 and Fm3¯m-LaH10 can be replaced with lanthanum (∼70%) and yttrium (∼25%), respectively, with the formation of unique ternary superhydrides containing metal-encapsulated cages La@H24 and Y@H32, which are specific for Im3¯m-LaH6 and Fm3¯m-YH10. This work demonstrates that hydrides, unstable in pure form such as LaH6 and YH10, may nevertheless be stabilized at relatively low pressures in solid solutions with superhydrides having the desired structure.



中文翻译:

镧-钇三元氢化物在 253 K 时的超导性

在这里,我们报告了 通过用氨硼烷对P 6 3 /mmc La-Y 合金进行激光加热,在 170-196 GPa 的压力下获得的一系列镧-钇三元氢化物的高压合成。结果,我们发现了几种新化合物:立方六氢化物 (La,Y)H 6和十氢化物 (La,Y)H 10具有最高临界温度T C  ∼ 253 K 和外推上临界磁场B C2 (0)在 183 GPa 时高达 135 T。电流-电压测量表明,(La,Y)H 10中的临界电流密度J C为 12–27.7 kA/mm 2在 4.2 K,这与商业超导线如 NbTi 和 Nb 3 Sn相当。(La,Y)H 6和(La,Y)H 10是三元高T C超导氢化物的第一个例子。我们的实验表明,最近发现的结构中的部分金属原子我是3¯-YH 6调频3¯-LaH 10可以分别替换为镧(~70%)和钇(~25%),形成独特的三元超氢化物,其中包含金属封装的笼 La@H 24和 Y@H 32,它们是特异性的我是3¯-LaH 6调频3¯-YH 10。这项工作表明,在具有所需结构的超氢化物的固溶体中,以纯形式不稳定的氢化物(例如 LaH 6和 YH 10)仍然可以在相对较低的压力下稳定。

更新日期:2021-07-01
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