Why Superconductor Research is in a 'Golden Age' - Despite Controversy

Davide Castelvecchi, writing for Nature: A Nature retraction last week has put to rest the latest claim of room-temperature superconductivity -- in which researchers said they had made a material that could conduct electricity without producing waste heat and without refrigeration. The retraction follows the downfall of an even more brazen claim about a supposed superconductor called LK-99, which went viral on social media earlier this year. Despite these high-profile setbacks, superconductivity researchers say the field is enjoying somewhat of a renaissance. "It's not a dying field -- on the contrary," says Lilia Boeri, a physicist who specializes in computational predictions at the Sapienza University of Rome. The progress is fuelled in part by the new capabilities of computer simulations to predict the existence and properties of undiscovered materials. Much of the excitement is focused on 'super-hydrides -- hydrogen-rich materials that have shown superconductivity at ever-higher temperatures, as long as they are kept at high pressure. The subject of the retracted Nature paper was purported to be such a material, made of hydrogen, lutetium and nitrogen. But work in the past few years has unearthed several families of materials that could have revolutionary properties. "It really does look like we're on the hairy edge of being able to find a lot of new superconductors," says Paul Canfield, a physicist at Iowa State University in Ames and Ames National Laboratory.

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