Superconductors could at some point help power a brand new generation of ultra-efficient electronics, but major technical hurdles have kept the technology largely confined to research labs. Now, scientists at Chalmers University of Technology in Sweden have developed a brand new approach that tackles certainly one of the sphere’s biggest challenges: maintaining superconductivity at higher temperatures while also resisting strong magnetic fields.
The advance could help move superconducting technologies closer to practical use in electronics, energy systems, and quantum devices.
Modern digital devices, data centers, and knowledge and communications technology (ICT) networks are chargeable for an estimated 6 to 12 percent of worldwide electricity consumption. As energy demand continues to rise, researchers are trying to find ways to make electronics way more efficient.
Superconductors are particularly attractive because they’ll carry electrical current with no energy loss. Unlike conventional electronic systems, which waste energy as heat, superconductors can transmit electricity without resistance. In theory, this might make power grids, electronics, and quantum technologies a whole bunch of times more efficient.
Why Superconductors Are Difficult To Use
Despite their promise, superconductors face several obstacles that limit their real-world applications.
One challenge is temperature. Many superconductors only work at extremely low temperatures, often around minus 200 degrees Celsius. Reaching and maintaining such temperatures requires complex and energy-intensive cooling systems.
Magnetic fields present one other major problem. Strong magnetic fields can weaken and even eliminate superconductivity. This is especially necessary because many advanced electronic systems and quantum technologies either generate or depend on magnetic fields.
To turn out to be practical for widespread use, superconducting materials must have the opportunity to operate at higher temperatures (ideally near room temperature) while remaining stable in strong magnetic environments.
A Different Strategy for Stronger Superconductivity
Researchers have spent years attempting to improve superconductors by altering their chemical composition, but progress has been limited. The Chalmers team decided to take a distinct approach.
“By sculpting the surface that the superconductor rests on, we were capable of induce superconductivity at significantly higher temperatures than previously possible. We also found that the fabric remained superconducting even when exposed to strong magnetic fields,” explains Floriana Lombardi, Professor of Quantum Device Physics at Chalmers and lead creator of a study published in Nature Communications.
How a Tiny Surface Change Made a Big Difference
The researchers worked with a copper-oxide material from the cuprate family. Cuprates are already known for exhibiting superconductivity at relatively high temperatures, but their chemical structure is difficult to switch once they’ve been manufactured.
The superconducting layer utilized in the study was only just a few nanometers thick, lower than one millionth the thickness of a human hair. Such ultrathin materials have to be grown on a supporting foundation called a substrate, which acts as a template during fabrication.
The breakthrough got here from making nanoscale modifications to the substrate itself.
“Since the atoms within the substrate are arranged in a selected pattern, they’ll ‘guide’ how the atoms within the superconducting layer settle. By changing the surface design of the substrate, we were capable of influence the superconducting properties and ensure they were preserved, even at higher temperatures and when high magnetic fields were applied,” explains Eric Walhberg, a researcher at RISE Research Institutes of Sweden.
Before adding the superconducting film, the team treated the substrate in a vacuum at hot temperature. This process created an orderly pattern of tiny ridges and valleys across the surface.
Those microscopic features altered the electronic environment where the substrate and superconducting layer meet, creating conditions that favored stronger superconductivity.
“We could see how the electrons’ properties began to have a preferential direction on this interfacial region and behave in a way that stabilized and strengthened the superconducting state,” says Lombardi.
A Latest Design Principle for Future Superconductors
The findings introduce a brand new way of interested by superconducting materials. As a substitute of focusing solely on discovering recent materials or changing their chemistry, researchers may have the opportunity to enhance performance by fastidiously engineering the surfaces on which those materials are grown.
“As a substitute of trying to find entirely recent materials or manipulating the chemical properties of existing ones, we are actually showing how superconductivity will be enhanced by sculpting the substrate,” says Lombardi.
The researchers consider this strategy could eventually help superconductors function at much higher temperatures, potentially even approaching room temperature.
The work also points toward future applications in energy-efficient electronics, advanced quantum components, and technologies that must operate in strong magnetic fields.
“This shows that very small changes on the nanoscale can have decisive effects and should even unlock the complete potential of superconductivity in future electronics,” says Lombardi.
Study Details
The study, “Boosting superconductivity in ultrathin YBa2Cu3O7−δ movies via nanofaceted substrates,” was published within the journal Nature Communications.
The authors are Eric Wahlberg, Riccardo Arpaia, Debmalya Chakraborty, Alexei Kalaboukhov, David Vignolles, Cyril Proust, Annica M. Black-Schaffer, Thilo Bauch, Götz Seibold, and Floriana Lombardi.
Researchers involved within the project are affiliated with Chalmers University of Technology, RISE Research Institutes of Sweden, Ca’ Foscari University of Venice, Italy, Birla Institute of Technology and Science — Pilani, K. K. Birla Goa Campus, India, Indian Institute of Science Education and Research (IISER), India, Uppsala University, Sweden, Université Grenoble Alpes, Université de Toulouse, INSA-T, France, and Institut für Physik, BTU Cottbus-Senftenberg, Germany.
A part of the research was carried out at Myfab Chalmers, a cleanroom facility.
Funding was provided by the Swedish Research Council (VR), the Knut and Alice Wallenberg Foundation, the European Union through an EIC Pathfinder grant, and the Deutsche Forschungsgemeinschaft.