High-temperature cuprate superconductors are well known to the general science community for the simple reason that their transition temperature, T_c, is much higher than that of other superconductors. Perhaps less well known is the fact that T_c varies dramatically from one family of cuprates to the next. Understanding this dependence of T_c on crystalline structure would obviously be key to designing even higher temperature superconductors, but the origin of this variation is still not well understood, even after two decades of study.
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