“…The CuO 2 planes are found to be more favorable for superconductivity as compared to insulating charge reservoir block containing single or double Tl-O layers [110]. The superconducting properties like critical temperature, irreversibility field, critical current density and flux pinning in thallium-based compounds largely depend on the thickness of the insulating Tl-O layer and the strength of Josephson coupling between CuO 2 planes [23,49,50,53,[111][112][113][114][115]. The presence of the Tl-O layers between the CuO 2 superconducting blocks yields anisotropy in the physical properties of these compounds.…”