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Disappearing and reappearing superconductivity

HT cuprate- iron selenide-based superconductorsNew work from a team including Carnegie’s Xiao-Jia Chen and Ho-kwang “Dave” Mao demonstrates unexpected superconductivity in a type of compounds called iron selenium chalcogenides. 

The research team, led equally by Liling Sun of the Chinese Academy of Sciences and Xiao-Jia Chen, discovered a second wave of superconductivity reappearing at around 122,000 times atmospheric pressure (12.4 GPa) and a transition temperature of about -373 degrees Fahrenheit without change in the basic structure of chalcogenide compounds under the extreme pressure.

Chen said “our work will likely stimulate a great deal of future study, both experimental and theoretical, in order to clarify what causes this reemergence of superconductivity.” Research to create superconductors at higher temperatures has the promise of significant impact on more efficient energy transmission. 

Their work is published online by Nature on 22 February 2012. See also Carnegie News.