Researchers at the U.S. Department of Energy’s Brookhaven National Laboratory have discovered an interesting type of electronic behavior in a recently discovered class of superconductors known as cobalt oxides, or cobaltates. These materials operate quite differently from other oxide superconductors, namely the copper oxides (or cuprates), which are commonly referred to as high-temperature superconductors.
When traditional superconductors are cooled to nearly absolute zero (0 Kelvin or –452 degrees Fahrenheit), pairs of negatively charged electrons exchange packets of vibrational energy known as phonons. This mechanism overcomes the repulsion of the like-charged particles and allows them to move together to carry electrical current with virtually no resistance. But the mechanism for superconductivity in the high-temperature cuprates — which act as superconductors at temperatures as “warm” as 138 K — is still one of the “hottest” mysteries in condensed matter physics. Above the superconducting transition temperature the cuprates do not exhibit normal electronlike behavior, so it’s unclear either how or what is pairing to carry the current.
With the discovery of a new class of oxide superconductors, the cobaltates (which become superconducting at a temperature around 5 K), scientists were naturally curious whether they could learn something about their mechanism to shed light upon this problem. “What we’ve found,” says Brookhaven physicist Peter Johnson, “has opened up another twist.”
Karen McNulty Walsh | BNL
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An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
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Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
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Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
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