{'fraction_non_alphanumeric': 0.03417721518987342, 'fraction_numerical': 0.017721518987341773, 'mean_word_length': 5.034351145038168, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Magnetoresistance studies of Tl-1212 phase substituted by scandium

Superconducting samples of TlBa2CaCu2−xScxO7−δ with x = 0.0,0.025,0.05,0.1,0.15 and 0.2 have been prepared via the solid-state reaction technique. The effect of weak magnetic fields up to 4.4 kG on the electrical resistivity of the prepared samples has been studied to investigate the flux motion for this phase. The results reveal a slight shift in the superconducting transition temperature Tc and an increase in the superconducting transition width ΔT with increasing magnetic field. The magnetic field has a small effect on the electrical resistivity in the normal state and in the first stage of transition, whereas the change in the second stage of superconducting transition is very large. The experimental data, in the second stage of superconducting transition, fit well with the thermally activated flux creep model and the activation energy U(B) shows a power law dependence on magnetic field as B−β. Also, the transition width is related to the magnetic field according to the relation ΔTαBn. The values of β and n are strongly dependent on the scandium content. The magnetic field and temperature dependence of the activation energy U(B,T) is found to be U(B,T)∼ΔTB−η, where η = β+n. The critical current density Jc(0) and the upper critical field Bc2(0) are calculated, from the above measurements, as a function of scandium content. Finally, the electronic thermal conductivity κe, estimated from the Wiedermann–Franz law, is reported at different applied magnetic fields for the prepared samples.