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No evidence of superconductivity in the compressed sample prepared from the lutetium foil and H2/N2 gas mixture
- Source :
- Matter and Radiation at Extremes 8 (2023) 048001
- Publication Year :
- 2023
-
Abstract
- A material described as lutetium-hydrogen-nitrogen (Lu-H-N in short) was recently claimed to have near-ambient superconductivity[Gammon et al, Nature 615, 244, 2023]. If the results 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 that reported by Gammon et al. Our X-ray diffraction measurements indicated that the obtained sample contained three substances: the FCC-1 phase (Fm-3m) with a lattice parameter a=5.03 {\AA}, the FCC-2 phase (Fm-3m) with a lattice parameter a= 4.755 {\AA} and Lu metal. These two FCC phases are identical to the those reported in the so-called near-ambient superconductor. However, we found that the samples had no evidence of superconductivity, through our resistance measurements in the temperature range of 300 - 4 K and pressure range of 0.9 - 3.4 GPa, and our magnetic susceptibility measurements in the pressure range of 0.8-3.3 GPa and temperature down to 100 K. We also used a laser heating technique to heat the sample to 1800{\deg}C and found no superconductivity in the produced dark blue samples below 6.5 GPa. In addition, the color of the both samples remain dark blue in the pressure range investigated.<br />Comment: 13 pages and 4 figures
- Subjects :
- Condensed Matter - Superconductivity
Subjects
Details
- Database :
- arXiv
- Journal :
- Matter and Radiation at Extremes 8 (2023) 048001
- Publication Type :
- Report
- Accession number :
- edsarx.2304.03100
- Document Type :
- Working Paper