The quest for the most elusive material in physics

Superconductors haven’t seen widespread commercial applications due to their cost, the effort required to produce them, and perhaps reluctance by old-school companies to adopt such a radically new material, reports IEEE Spectrum. But a room-temperature superconductor could drastically decrease energy costs and might end up in new technologies that scientists haven’t even dreamed of yet.

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Now feels like a turning point: lanthanum hydride is the closest a room-temperature superconductor has felt to reality. But visiting with Geballe at the Geophysical Laboratory, it was hard to imagine the slivers of the material—smaller than the width of a human hair—fashioned into a wire or used in any technology at all. Nor is that the point. Materials scientists are working at the boundary of the present and the future, performing grueling, hands-on research hoping to develop substances that might not even have any applications.

“Who knows?” Geballe told me when I asked whether we’d ever see high-temperature superconductors that can exist without being squeezed between diamonds. “Maybe next year, maybe never.”

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