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Absence of superconductivity in I 4/ mmm -FeH 5 : experimental evidence.

Yulong WangSu ChenJianning GuoXiaoli HuangTian Cui
Published in: Physical chemistry chemical physics : PCCP (2024)
The experimentally discovered FeH 5 exhibits a structure built of atomic hydrogen that only has bonding between hydrogen and iron atoms [C. M. Pepin, G. Geneste, A. Dewaele, M. Mezouar and P. Loubeyre, Science , 2017, 357 , 382]. However, its superconductivity has remained unsolved since its discovery. In this work, we have synthesized I 4/ mmm -FeH 5 at 139 GPa combined with laser-heating conditions. The electrical resistance measurements at ultrahigh pressures indicate that no evidence of superconducting transition of FeH 5 is observed in the temperature range of 1.5 K to 270 K. These results indicate that I 4/ mmm -FeH 5 does not exhibit superconductivity within the experimental temperature range, and the introduction of iron atoms is not beneficial to the formation of the superconducting phase.
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