Suppression of 3D mobility of carrier and superconductivity by Y+3 substitution in Cu0.5Tl0.5Ba2(Ca2−xYx)Cu3O10−δ samples

Mumtaz, M.; Khan, Nawazish A.; Abbas, Saleem; Shehzad, Khurram

doi:10.1016/j.ceramint.2013.08.076

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…4. The absorption bands in the range from 400 to 540 cm À 1 are associated with the apical oxygen atoms and in the range around from 541 to 600 cm À 1 are associated with CuO 2 planar oxygen atoms [32,33]. The absorption bands in the range from 670 to 700 cm À 1 are associated with O δ atoms in the charge reservoir layer [34][35][36][37][38].…”

Section: Resultsmentioning

confidence: 96%

Synthesis and superconductivity of (Ag) x /CuTl-1223 composites

Jabbar

Qasim

Mumtaz

et al. 2015

Progress in Natural Science: Materials International

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Series of (Ag) x /(Cu 0.5 Tl 0.5 Ba 2 Ca 2 Cu 3 O 10-δ ) {(Ag) x /CuTl-1223} nano-superconductor composites were synthesized with different concentrations (i.e. x ¼0 $ 4.0 wt%) of silver (Ag) nanoparticles. Low anisotropic CuTl-1223 superconducting matrix was prepared by solid-state reaction and Ag nanoparticles were prepared by a sol-gel method separately. The required (Ag) x /CuTl-1223 composition was obtained by the inclusion of Ag nanoparticles in CuTl-1223 superconducting matrix. Structural, morphological, compositional and superconducting transport properties of these composites were investigated in detail by x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-rays (EDX) spectroscopy and four-point probe electrical resistivity (ρ) measurements. The inclusion of Ag nanoparticles enhanced the superconducting properties without affecting the tetragonal structure of the host CuTl-1223 matrix. The improvement in superconducting properties of (Ag) x /CuTl-1223 composites is most likely due to enhanced inter-grains coupling and increased superconducting volume fraction after the addition of metallic Ag nanoparticles at the inter-crystallite sites in the samples. The presence of Ag nanoparticles at the grain-boundaries may increase the number of flux pinning centers, which were present in the form of weak-links in the pure CuTl-1223 superconducting matrix.

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Section: Resultsmentioning

confidence: 96%

Synthesis and superconductivity of (Ag) x /CuTl-1223 composites

Jabbar

Qasim

Mumtaz

et al. 2015

Progress in Natural Science: Materials International

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“…The decrease was suggested to cause increase in Fermi wave vector, k F and coherence length, ξ c (0). [25][26][27] Ultrasonic velocity measurements in Cd substituted Tl 0.9 Bi 0.1 Sr 1.8 Yb 0.2 Ca 1 À x Cd x Cu 1.99 Fe 0.01 O 7 À δ can be used to investigate if the softening and the decrease in separation between CuO 2 planes have any effect on elastic properties and help elucidate the actual mechanism of the step-like ultrasonic anomalies. Furthermore, it is of interest to study Fe-doped Tl1212 compounds as substitution of magnetic ions such as Fe has been suggested to suppress AFM Cu spins in CuO 2 planes of several cuprates and improved superconductivity [28,29].…”

Section: Introductionmentioning

confidence: 99%