“If this state could persist at ambient temperature, it would profoundly transform our technological world”
Three physicists at the Université de Sherbrooke led an international team to first direct measurement of the critical magnetic field in cuprates, the most promising materials for superconductivity. This breakthrough resolves an enigma that has baffled researchers for 20 years and clears the way for major advances. The study is published in the prestigious journal Nature Communications.
A Dream Destination: Superconductivity at Ambient Temperature
When some materials are cooled to very low temperature, barely above absolute zero (-273 °C), they become superconductors, and their electrical and magnetic properties change radically. They acquire a nearly magical property: they carry electricity perfectly, without any energy loss.
The most promising superconducting materials are copper oxides, also called cuprates. They are, at present, the materials that become superconductors at the highest temperature, specifically -150 °C, which is halfway between absolute zero and ambient temperature.
So, for now, these materials must still be cooled down to extremely low temperatures before they become superconducting. “If this state could persist at ambient temperature, it would profoundly transform our technological world,” maintains Louis Taillefer, holder of the Canada Research Chair in Quantum Materials and the study’s senior investigator. The transmission of electricity around the world would be radically changed, for example. “This great dream will become possible when scientists understand how to increase the maximum value of the critical temperature by a factor of two or more.”
The team has just identified one of the main mechanisms limiting the critical temperature of cuprates, which opens a new direction in determining how to increase it.
A Million Times Stronger than the Earth’s Magnetic Field
In addition to their critical temperature, another fundamental property of superconductors is their critical magnetic field. What is its value in cuprates?
In order to measure the critical field of cuprates, the team investigated their capacity to conduct heat. A material’s heat conductivity turns out to be very sensitive to the onset of superconductivity. The very first direct measurement of this critical field in cuprates was made possible as the result of a novel approach developed by the group of researchers working on the physics of quantum materials at the Université de Sherbrooke.
“The key to our discovery,” says Nicolas Doiron-Leyraud, “was developing equipment at Sherbrooke that can make such measurements under very strong magnetic fields.” The team then traveled to specialized laboratories in Tallahassee, Florida, and Grenoble, France, where magnetic fields up to 1 million times the earth’s field are produced.
“Once there, we realized that it was the first time that anyone had made such an attempt, explains Gaël Grissonnanche, PhD student in physics and first author on the paper. The first measurements on the first day… and it worked!”
The Latest on: Superconductivity
via Google News
The Latest on: Superconductivity
- Superconductors: Global Marketson February 25, 2021 at 1:47 pm
The global market for superconductivity applications was worth $REDACTED in 2019, a figure that is expected to ...
- The Race Toward Room-temperature Superconductors Heats Upon February 25, 2021 at 9:52 am
This month alone, multiple research institutions have flooded the press with news of a singular goal: to create room-temperature superconductors.
- A superconducting switch actuated by injection of high-energy electronson February 24, 2021 at 2:50 am
A recent finding of tuning critical current in metallic nanowires by application of small gate voltages seems at odds with general understanding. Here, Ritter et al. study similar nanowires and link ...
- What Does the World's First Room-Temperature Superconductor Mean for Construction?on February 22, 2021 at 11:43 am
Nearly $5 trillion up for grabs in retrofitting work and a way to reduce emissions created from the current U.S. power grid? It may not be as far-fetched as it sounds.
- Scientists create ‘beautiful marriage’ of quantum enemieson February 22, 2021 at 3:17 am
Cornell scientists have identified a new contender when it comes to quantum materials for computing and low-temperature electronics. Using nitride-based materials, the researchers created a material ...
- Discovering a New Form Of Magnetism in 'Magnetic Graphene'on February 22, 2021 at 2:45 am
AZoNano speaks with Dr. Matthew Coak from the University of Warwick and the University of Cambridge, leader of an international team that has identified a new form of magnetism in so-called magnetic ...
- Historical Engineers: John Bardeen, Creator of the Transistor and Theory of Superconductivityon February 19, 2021 at 4:48 pm
Awarded the Nobel Prize twice, John Bardeen is often recognized as one of the founders of the first transistor and the theory of superconductivity.
- Twisted trilayer graphene could help make high-temperature superconductorson February 19, 2021 at 1:32 pm
Two’s company, but three’s a crowd – unless you’re trying to make graphene superconduct at higher temperatures. That is the finding of researchers at Harvard University in the US, who discovered that ...
- A New Class of Superconductors: Commonly Mistaken Name Leads to Discoveryon February 15, 2021 at 4:47 pm
A new theory that could explain how unconventional superconductivity arises in a diverse set of compounds might never have happened if physicists Qimiao Si and Emilian Nica had chosen a different name ...
- Two-dimensional superconductivity and anisotropic transport at potassium tantalate interfaceson February 15, 2021 at 1:42 pm
The superconductivity in the EUO/KTO sample also showed a robust critical-current behavior. As the team raised the temperature close to the transition temperature, they noted a gradual onset of a ...
via Bing News