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Superconductivity

Death of a Fermi surface

Every metal, semimetal and doped semiconductor has a Fermi surface that determines its physical properties. A new state of matter within the 'pseudogap' state of a high-temperature superconductor destroys the Fermi surface, the process of which provides information about the new state.

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Figure 1: Phase diagram of a typical hole-doped copper oxide superconductor.
Figure 2: The square Brillouin zone of a copper oxide superconductor.

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McElroy, K. Death of a Fermi surface. Nature Phys 2, 441–442 (2006). https://doi.org/10.1038/nphys355

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