More than 20 years ago, Bednorz and Muller discovered superconductivity in copper oxides at remarkably high temperatures. Since then, physicists have struggled to understand the mechanisms at work. Recently, a set of experiments on cuprates in high magnetic fields has completely changed the landscape of research in high-temperature superconductors (HTSs). In particular, the data suggest that the current carriers are both electrons and holes, when in fact the materials are "hole doped"—i.e., the current carriers should be positively charged.
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