Family tree of perovskite-related superconductors

Details Family tree of perovskite-related superconductors Family tree of perovskite-related superconductors

2008-10-20

arxiv.org/abs/0810.3501v1

Physics

Condensed Matter

Superconductivity

8 pages, 1 figure

Scientific paper

A simple empirical relation has been found to exist between optimum Tc and the formal mean cation charge of perovskite-related superconductors, covering both conventional superconductors and superconducting cuprates. Tc is shown to increase exponentially with decreasing . It is suggested that a Ba-based cuprate with about 2 reach a Tc around 200 K. The strong correlation may be thought of as an indication for a common mechanism of superconductivity of the whole family of compounds. In addition, the structural assignment for the 'cubic' high-Tc phase reported by Volkov (Tc = 117 K) to the orthorhombic BaCuO2.5 prototype is proposed.

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