Abstract
Properties of the hole-type, single-layer cuprate T ∗-phase superconductors are discussed. There is a strong variation of T c with rare-earth constituent and oxygenation pressure. The magnetic properties of these materials have not yet been well investigated, but some aspects of the rare-earth ordering appear to be different from other known cuprates.
Highlights
Rare earth cuprates of the general formula R,CuO, form in three basic structure types, the so-called T, T*- and T’-phases
We note that X-ray data are consistent with the presence of stacking faults involving planes of square-pyramids coordinated copper and that there are substantial changes in the transport and superconducting properties with accompanying oxygen loading: as prepared materials are semiconductor-like but with increased oxygenation pressure the transport becomes metallic in character and superconductivity appears
There has so far been no report on magnetic ordering in copper in T*-phase material
Summary
Rare earth cuprates of the general formula R,CuO, form in three basic structure types, the so-called T-, T*- and T’-phases. The T*-phase forms only with a combination of two rare earths, usually, but not always, lanthanum being one of them, and, with the exceptions of La,,,Tb,,,CuO, and La,,,,Dy,,,,,CuO,, strontium is required to stabilize the compound. Phases, as well as having similarities to the Y 123 copper environment. Tokura et al [5] and Cheong et al [6] greatly extended the range of known T*-phase cuprates and their superconductivity
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