No evidence of superconductivity in a compressed sample prepared from lutetium foil and H2/N2 gas mixture

A material described as lutetium–hydrogen–nitrogen (Lu-H-N in short) was recently claimed to have “near-ambient superconductivity” [Dasenbrock-Gammon et al., Nature 615, 244–250 (2023)]. If this result could be reproduced by other teams, it would be a major scientific breakthrough. Here, we report o...

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Veröffentlicht in:Matter and radiation at extremes 2023-07, Vol.8 (4), p.76-80
Hauptverfasser: Cai, Shu, Guo, Jing, Shu, Haiyun, Yang, Liuxiang, Wang, Pengyu, Zhou, Yazhou, Zhao, Jinyu, Han, Jinyu, Wu, Qi, Yang, Wenge, Xiang, Tao, Mao, Ho-kwang, Sun, Liling
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Sprache:eng
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Zusammenfassung:A material described as lutetium–hydrogen–nitrogen (Lu-H-N in short) was recently claimed to have “near-ambient superconductivity” [Dasenbrock-Gammon et al., Nature 615, 244–250 (2023)]. If this result could be reproduced by other teams, it would be a major scientific breakthrough. Here, we report our results of transport and structure measurements on a material prepared using the same method as reported by Dasenbrock-Gammon et al. Our x-ray diffraction measurements indicate that the obtained sample contains three substances: the face-centered-cubic (FCC)-1 phase (Fm-3m) with lattice parameter a = 5.03 Å, the FCC-2 phase (Fm-3m) with a lattice parameter a = 4.755 Å, and Lu metal. The two FCC phases are identical to the those reported in the so-called near-ambient superconductor. However, we find from our resistance measurements in the temperature range from 300 K down to 4 K and the pressure range 0.9–3.4 GPa and our magnetic susceptibility measurements in the pressure range 0.8–3.3 GPa and the temperature range down to 100 K that the samples show no evidence of superconductivity. We also use a laser heating technique to heat a sample to 1800 °C and find no superconductivity in the produced dark blue material below 6.5 GPa. In addition, both samples remain dark blue in color in the pressure range investigated.
ISSN:2468-2047
2468-080X
2468-080X
DOI:10.1063/5.0153447