Enormous variation in homogeneity and other anomalous features of room temperature superconductor samples: a Comment on Nature 615, 244 (2023)

Abstract

The resistive transition width of a recently discovered room temperature near-ambient-pressure superconductor [1] changes by more than three orders of magnitude between different samples, with the transition temperature nearly unchanged. For the narrowest transitions, the transition width relative to $T_c$ is only $0.014\%$. The voltage-current characteristics indicate vanishing critical current, and the normal state resistance is unusually small. These anomalous behaviors and other issues indicate that this system is not a superconductor. Implications for other hydrides are discussed.

A shorter version was submitted as Matters Arising on "Evidence of near-ambient superconductivity in a N-doped lutetium hydride", Nature 615, 244 (2023)

References in corpus (15)

• High-Temperature Superconductivity in Cerium Superhydrides
• Superconductivity to 262 kelvin via catalyzed hydrogenation of yttrium at high pressures
• Superconducting Phase-Diagram of H3S under High Magnetic Fields
• Trapped magnetic flux in hydrogen-rich high-temperature superconductors
• Room Temperature Superconductivity: the Roles of Theory and Materials Design
• Absence of near-ambient superconductivity in LuH${}_{2\pm \text{x}}$N${}_y$
• Search for ambient superconductivity in the Lu-N-H system
• High-temperature superconductivity in hydrides
• Absence of high temperature superconductivity in hydrides under pressure
• Pressure-induced color change in the lutetium dihydride LuH2
• Structure, Stability and Superconductivity of N-doped Lutetium Hydrides at kbar Pressures
• The near room-temperature upsurge of electrical resistivity in Lu-H-N is not superconductivity, but a metal-to-poor-conductor transition
• Pressure induced color change and evolution of metallic behavior in nitrogen-doped lutetium hydride
• Evidence against superconductivity in flux trapping experiments on hydrides under high pressure & On magnetic field screening and expulsion in hydride superconductors
• Clear evidence against superconductivity in hydrides under high pressure

Cited by in corpus (9)

• Structure, Stability and Superconductivity of N-doped Lutetium Hydrides at kbar Pressures
• The near room-temperature upsurge of electrical resistivity in Lu-H-N is not superconductivity, but a metal-to-poor-conductor transition
• Observation of non-superconducting phase changes in LuH${}_{2\pm \text{x}}$N${}_y$
• Electronic and magnetic properties of Lu and LuH${}_2$
• On magnetic field screening and trapping in hydrogen-rich high-temperature superconductors: unpulling the wool over readers' eyes
• Quantifying the nonadiabaticity strength constant in recently discovered highly-compressed superconductors
• Anatomy of the band structure of the newest apparent near-ambient superconductor LuH${}_{3-x}$N${}_x$
• Unveiling a Novel Metal-to-Metal Transition in LuH2: Critically Challenging Superconductivity Claims in Lutetium Hydrides
• Reply to "Comment on `Nonstandard superconductivity or no superconductivity in hydrides under high pressure' "