Phys.org June 25, 2024 In recent experimental signatures of superconductivity close to 80 K in La3Ni2O7 under pressure, a zero-resistance was not observed. Researchers in China showed that the zero-resistance state does exist in single crystals of La3Ni2O7. They found that the system remained metallic under applied pressures, suggesting the absence of a metal–insulator transition proximate to the superconductivity. Analysis of the normal state T-linear resistance revealed a link between this strange-metal behaviour and superconductivity. This was in line with other classes of unconventional superconductors, including the cuprates and Fe-based superconductors. According to the researchers further investigations exploring the interplay of […]
Tag Archives: High temperature superconductor
Preventing magnet meltdowns before they can start
Science Daily March 11, 2024 Unlike conventional magnets where a normal zone expands typically quickly, and the stored energy is dissipated across a large volume of the windings, a normal zone in a High-temperature superconductor (HTS) magnet propagates slowly and, thus, can heat up quickly to high temperatures destroying the conductor. At the same time, growing experimental evidence suggests that HTS conductors can operate in a stable dissipative flux flow regime for a substantial range of operational currents before entering an irreversible thermal runaway. Researchers at Lawrence Berkeley National Laboratory proposed a simple criterion for the thermal runaway in HTS […]
New 2D superconductor forms at higher temperatures than ever before
Phys.org April 27, 2021 The distinctive electronic structure found at interfaces between materials can allow unconventional quantum states to emerge. An international team of researchers (USA – Argonne National Laboratory, University of Illinois, China) has discovered superconductivity in electron gases formed at interfaces between (111)-oriented KTaO3 and insulating overlayers of either EuO or LaAlO3. The superconducting transition temperature, as high as 2.2 kelvin, is about one order of magnitude higher than that of the LaAlO3/SrTiO3 system. Similar electron gases at KTaO3 (001) interfaces remain normal down to 25 millikelvin. The critical field and current-voltage measurements indicated that the superconductivity is […]