Superconducting properties of Cu0.5Tl0.5(BaCa)(CaMg)1.5Cu4−yCdyO12−δ (y=0,1,2,3) samples

Abstract

In order to investigate the significance of electron–phonons interaction in the origin of high [Formula: see text] superconductivity, we synthesized Cd-doped Cu[Formula: see text]Tl[Formula: see text](BaCa)(CaMg)[Formula: see text]Cu[Formula: see text]CdyO[Formula: see text] ([Formula: see text], 1, 2, 3) samples and studied the superconducting properties. Onset temperature of the superconductivity Cu[Formula: see text]Tl[Formula: see text](BaCa)(CaMg)[Formula: see text]Cu[Formula: see text]CdyO[Formula: see text] ([Formula: see text], 1, 2, 3) samples suppress with the increased Cd doping ratio in the final. The phonon modes are associated to the vibrations of apical and planar oxygen whereas the CuO2 planar oxygen modes are observed to harden with increasing Cd ratio in sample doping. The phase relaxation time is suppressed for the superconducting charge carriers in Cd-doped samples. The energy amount required to break the Cooper pairs apart increases. Dielectric measurements of Cu[Formula: see text]Tl[Formula: see text](BaCa)(CaMg)[Formula: see text]Cu[Formula: see text]CdyO[Formula: see text] ([Formula: see text], 1, 2, 3) samples have been done.