Brand new physics of superconducting metals refuted by physicists
|sciencedaily.com 12 May 2021 at 17:46|
Lancaster scientists have demonstrated that other physicists recent "discovery" of the field effect in superconductors is nothing but hot electrons after all.
A team of scientists in the Lancaster Physics Department have found new and compelling evidence that the observation of the field effect in superconducting metals by another group can be explained by a simple mechanism involving the injection of the electrons, without the need for novel physics.
Dr Sergey Kafanov, who initiated this experiment, said: "Our results unambiguously refute the claim of the electrostatic field effect claimed by the other group. This gets us back on the ground and helps maintain the health of the discipline."
The experimental team also includes Ilia Golokolenov, Andrew Guthrie, Yuri Pashkin and Viktor Tsepelin.
Their work is published in the latest issue of Nature Communications.
When certain metals are cooled to a few degrees above absolute zero, their electrical resistance vanishes -- a striking physical phenomenon known as superconductivity. Many metals, including vanadium, which was used in the experiment, are known to exhibit superconductivity at sufficiently low temperatures.
For decades it was thought that the exceptionally low electrical resistance of superconductors should make them practically impervious to static electric fields, owing to the way the charge carriers can easily arrange themselves to compensate for any external field.
The Lancaster team embedded a similar nanoscale device into a microwave cavity, allowing them to study the alleged electrostatic phenomenon at much shorter timescales than previously investigated. At short timescales, the team could see a clear increase in the noise and energy loss in the cavity -- the properties strongly associated with the device temperature. They propose that at intense electric fields, high-energy electrons can "jump" into the superconductor, raising the temperature and therefore increasing the dissipation.
This simple phenomenon can concisely explain the origin of the "electrostatic field effect" in nanoscale structures, without any new physics.
Materials provided by Lancaster University . Note: Content may be edited for style and length.
Lancaster University. "Brand new physics of superconducting metals refuted by physicists." ScienceDaily. ScienceDaily, 12 May 2021.
Lancaster University. "Brand new physics of superconducting metals refuted by physicists." ScienceDaily. www.sciencedaily.com/releases/2021/05/210512083443.htm (accessed May 12, 2021).
June 4, 2020 Highly energetic, "hot" electrons have the potential to help solar panels more efficiently harvest light energy. But up until now, scientists haven t been able to measure the energies ...
July 5, 2018 Caffeine keeps physicists up at night. Particularly those concerned with the capacity of electrons to absorb energy. In a new study physicists have used the caffeine molecule as a playground to test ...
Dec. 19, 2016 How electrons interact with other electrons at quantum scale in graphene affects how quickly they travel in the material, leading to its high conductivity. Now, researchers have developed a model ...
July 13, 2016 A research team has confirmed the first observation of the hot electrons through the exothermic catalytic reaction occurring at the liquid phase. Previous findings were limited to observing hot ...