Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-01-28
Rev. Mod. Phys. vol. 82, 1719 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
To appear as a Colloquium in the April issue of Rev. Mod. Phys Updated version contains new references and a clarification con
Scientific paper
High-temperature superconductivity in the copper-oxide ceramics remains an unsolved problem because we do not know what the propagating degrees of freedom are in the normal state. As a result, we do not know what are the weakly interacting degrees of freedom which pair up to form the superconducting condensate. That the electrons are not the propagating degrees of freedom in the cuprates is seen most directly from experiments that show spectral weight redistributions over all energy scales. Of course, the actual propagating degrees of freedom minimize such spectral rearrangements. This review focuses on the range of epxerimental consequences such UV-IR mixings have on the normal state of the cuprates, such as the pseudogap, mid-infrared band, temperature dependence of the Hall number, the superfluid density, and a recent theoretical advance which permits the identification of the weakly interacting degrees of freedom in a doped Mott insulator. Within this theory, we show how the wide range of phenomena which typify the normal state of the cuprates arises including $T-$linear resistivity.
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