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- Title
Carrier Transport Enhancement by Doping Rubidium in Cu<sub>0.5</sub>Tl<sub>0.5</sub>-1223 Superconducting Phase.
- Authors
Kanwal, Anila; Khan, Nawazish A.; Garcia, Flávio; Safeer, Syed Hamza
- Abstract
The doping of alkali metals in the charge reservoir layer of copper thallium-based superconductors was of keen interest to the scientific community. To better understand how charge carriers influence superconductivity, we synthesize Cu0.5Tl0.5Ba2Ca2Cu3−yRbyO10−δ (y = 0, 1.0, 2, 2.5, 3) compounds by solid-state reaction technique. Utilizing x-ray diffraction, x-ray fluorescence spectroscopy, scanning electron microscopy, temperature-dependent resistivity, and Fourier transform infrared absorption measurements, we have studied the effects of rubidium Rb(5s1) substitution on the Cu0.5Tl0.5-1223 crystal structure. Although the sample mainly comprises tetragonal-1223 phase, some nominal derivative phases of RbO2 have also been identified. As the concentration of the Rb(5s1) in CuO2 superconducting plane increases, the critical temperature (Tc) decreases until the final compound has no superconductivity. The electronic response of charge carriers and lattice vibrations is present in the FTIR spectra of samples. The fluctuation-induced conductivity analysis was used to extract the intrinsic microscopic superconducting parameters, including the cross-over temperatures, coherence length along the c-axis ξc(0), inter-layer coupling (J), and Fermi velocity (VF). Enhancement in carrier density within Rb/CuO2 planes leads to suppression in Tc, suggesting that an-harmonic oscillations were produced in the conducting Rb/CuO2 planes as a result of the heavy mass of 37Rb85compared to 29Cu63.
- Subjects
CARRIER density; RUBIDIUM; ALKALI metals; X-ray fluorescence; INFRARED absorption; COPPER
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 12, p5208
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-023-05826-2