Electric transport and the pseudogap in the 1-2-3 HTSC system, under all-around compression (Review Article)

The problem of how high pressure impacts various electric transport mechanisms in HTSC compounds REBa2Cu3O7-δ (RE = Y, or another rare-earth ion) is considered. The features of the crystal structure and the effects that structural defects of different morphologies have on the electrical conductivity of these compounds in the normal, pseudogap, and superconducting states, are discussed. A review of the experimental data obtained in studies on the effect of high hydrostatic pressure on the various electric transport mechanisms of REBa2Cu3O7-δ compounds, with varying composition and technical prehistory, is conducted. Different theoretical models devoted to the subject of how high pressure impacts the electrical conductivity of 1-2-3 HTSC system compounds are discussed.

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