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Superconductivity

Death of a Fermi surface

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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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Further reading

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