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Nature 423, 398 (22 May 2003) | doi:10.1038/423398a;
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High-temperature superconductors: Universal nodal Fermi velocity
The mechanism that causes high-temperature superconductivity in copper oxide materials (cuprates) is still unknown, more than 15 years after it was discovered. As the charge carriers (electrons or holes) are introduced into the parent antiferromagnetic insulator, a process called doping, the material evolves from an insulator to a superconductor, and eventually to a normal metal.
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