Superconductivity at 215 K in lanthanum hydride at high pressures

A. P. Drozdov; V. S. Minkov; S. P. Besedin; P. P. Kong; M. A. Kuzovnikov; D. A. Knyazev; M. I. Eremets

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arXiv · 1808.07039

Superconductivity at 215 K in lanthanum hydride at high pressures

A. P. Drozdov·V. S. Minkov·S. P. Besedin·P. P. Kong·M. A. Kuzovnikov·D. A. Knyazev·M. I. Eremets

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Abstract

We synthesized lanthanum hydride (LaHx) by laser heating of lanthanum in hydrogen atmosphere at pressure P = 170 GPa. The sample shows a superconducting step at 209 K and 170 GPa and temperature dependence of resistance. By releasing the pressure to 150 GPa, the superconducting transition temperature Tc increases to 215 K - the record Tc. This finding supports a way of achieving Tc higher than the one in H3S (203 K) in hydrides with sodalite-like structures, first proposed for CaH6 (Tc=245 K) and later for yttrium and lanthanum hydrides where higher, room temperature superconductivity is expected.

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A. P. Drozdov, V. S. Minkov, S. P. Besedin, P. P. Kong, M. A. Kuzovnikov, D. A. Knyazev, M. I. Eremets. 2018-08-21. Superconductivity at 215 K in lanthanum hydride at high pressures. https://arxiv.org/abs/1808.07039

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