(RE)Ba(2)Cu(3)O(7−δ) and the Roeser-Huber Formula

We apply the Roeser–Huber formula to the (RE)Ba [Formula: see text] Cu [Formula: see text] O [Formula: see text] (REBCO with RE= rare earths) high- [Formula: see text] superconducting material class to calculate the superconducting transition temperature, [Formula: see text] , using the electronic configuration and the crystallographic data. In a former publication (H. P. Roeser et al., Acta Astronautica 2008, 62, 733–736), the basic idea was described and [Formula: see text] was successfully calculated for the YBa [Formula: see text] Cu [Formula: see text] O [Formula: see text] compound with two oxygen doping levels [Formula: see text] 0.04 and 0.45, but several open questions remained. One of the problems remaining was the determination of [Formula: see text] for the [Formula: see text] 0.45 sample, which can be explained regarding the various oxygen arrangements being possible within the copper-oxide plane. Having established this proper relation and using the various crystallographic data on the REBCO system available in the literature, we show that the Roeser–Huber equation is capable to calculate the [Formula: see text] of the various REBCO compounds and the effects of strain and pressure on [Formula: see text] , when preparing thin film samples. Furthermore, the characteristic length, x, determined for the REBCO systems sheds light on the size of the [Formula: see text]-pinning sites being responsible for additional flux pinning and the peak effect.