Highly compressed hydrides have been at the forefront of the search for high-Tc superconductivity. The recent discovery of record-high Tc's in H3S and LaH10±x under high pressure fuels the enthusiasm for finding good superconductors in similar hydride groups. Guided by first-principles structure prediction, we successfully synthesized ZrH3 and Zr4H15 at modest pressures (30-50 GPa) in diamond anvil cells by two different reaction routes: ZrH2 + H2 at room temperature and Zr + H2 at ∼1500 K by laser heating. From the synchrotron X-ray diffraction patterns, ZrH3 is found to have a Pm3̅n structure corresponding to the familiar A15 structure, and Zr4H15 has an I4̅3d structure isostructural to Th4H15. Electrical resistance measurement and the dependence of Tc on the applied magnetic field of the sample showed the emergence of two superconducting transitions at 6.4 and 4.0 K at 40 GPa, which correspond to the two Tc's for ZrH3 and Zr4H15.

中文翻译：

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中等压力下的超导锆氢化物。

高度压缩的氢化物一直是寻求高Tc超导性的最前沿。最近在高压下在H3S和LaH10±x中发现创纪录的Tc值，这激发了在相似的氢化物组中寻找优质超导体的热情。在第一性原理结构预测的指导下，我们通过两种不同的反应途径，通过室温下的ZrH2 + H2和约1500 K的Zr + H2在两种不同的反应路径下成功地在金刚石砧座中以中等压力（30-50 GPa）合成了ZrH3和Zr4H15。 。从同步加速器的X射线衍射图中，发现ZrH3具有与熟悉的A15结构相对应的Pm3̅n结构，Zr4H15具有与Th4H15同构的I4̅3d结构。