Effect of 3d metal ion doping on the structure and superconductivity of (Tl0.5Pb0.5)Sr2CaCu2O7

Kandyel, E.; Sekkina, Morsy Abou; Dawoud, M.A.T.; Bohnam, M.Y.

doi:10.1016/j.ssc.2005.02.017

Cited by 18 publications

(5 citation statements)

References 49 publications

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“…A similar behavior was found by Kandyel et al [27] for Tl 0.5 Pb 0.5 Sr 2 CaCu 2−x Ni x O 7−δ phase. This variation could be due to the excess oxygencontent in the unit cell, resulting from the partial replacement of Cu 2+ ions by Ru 4+ ions.…”

Section: Resultssupporting

confidence: 88%

Ion Beam Analysis and Normal-State Conduction Mechanisms for (Bi, Pb)-2223 and (Tl, Pb)/Sr-1212 Superconducting Phases Substituted by Ruthenium

Awad

Roumié

Abou‐Aly

et al. 2011

J Supercond Nov Magn

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Superconducting samples of type Bi 1.8 Pb 0.4 Sr 2 Ca 2.1 Cu 3−x Ru x O 10+δ , (Bi, Pb)-2223, with 0.0 ≤ x ≤ 0.4 and type Tl 0.5 Pb 0.5 Sr 1.6 Ba 0.4 CaCu 2−x Ru x O 7−δ , (Tl, Pb)/ Sr-1212, with 0.0 ≤ x ≤ 0.525 were synthesized using the standard solid-state reaction technique. The lattice parameters and the surface morphology for these samples were determined using X-ray powder diffraction (XRD) and scanning electron microscope (SEM) measurements, respectively. All element-contents of the samples prepared were estimated from the electron dispersive X-ray (EDX) technique, and their results were compared with those obtained from particle-induced X-ray emission (PIXE). In addition, the oxygen-content was determined using elastic Rutherford backscattering spectroscopy (RBS) technique at 3 MeV proton beam. The superconducting transition temperature T c and the hole carrier concentration P were determined from the electrical resistivity measurement. The data of both T c and P for Bi 1.8 Pb 0.4 Sr 2 Ca 2.1 Cu 3−x Ru x O 10+δ and Tl 0.5 Pb 0.5 Sr 1.6 Ba 0.4 CaCu 2−x Ru x O 7−δ phases increased up to x = 0.05 and 0.075, respectively and then they decreased as x increased. The superconductivity was completely destroyed around x = 0.4 and 0.525 for (Bi, Pb)-2223 and (Tl, Pb)/Sr-1212 phases, respectively. The normal-state electrical resistivity data were analyzed using the two and three dimensional variable range hopping (2D-VRH and 3D-VRH) and the Coulomb gab (CG).

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Section: Resultssupporting

confidence: 88%

Ion Beam Analysis and Normal-State Conduction Mechanisms for (Bi, Pb)-2223 and (Tl, Pb)/Sr-1212 Superconducting Phases Substituted by Ruthenium

Awad

Roumié

Abou‐Aly

et al. 2011

J Supercond Nov Magn

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“…The relative volume fraction of (Tl,Pb)/Sr-1212 phase increases as x increases from 0.0 to 0.075, followed by a decrease in its value with further increase in x. In addition, [9] phases. This variation could be due to the excess oxygen content in the unit cell, resulting from the partial replacement of Cu 2+ ions by Ru 4+ ions [20].…”

Section: Samples Characterizationmentioning

confidence: 96%

“…This variation in T c mainly depends on the processing conditions, resulting oxygen content and other deviations from stoichiometry. Many methods were carried out to prepare (Tl,Pb)/Sr-1212 superconductor phase using the precursor method with solid-state reaction [4][5][6], wet chemical gel [7], two-step solid-state reaction [8] and multi-step solid solution reaction techniques [9]. In our work, we synthesized (Tl,Pb)/Sr-1212 phase by the conventional one-step solid-state reaction technique via a short time, using SrO 2 instead of SrCO 3 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Magnetoresistance Studies of Tl0.5Pb0.5Sr1.6Ba0.4CaCu2−x Ru x O7−δ Superconductor

Abou‐Aly

Awad

Mahmoud

et al. 2011

J Supercond Nov Magn

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Bulk superconducting samples of type Tl 0.5 Pb 0.5 Sr 1.6 Ba 0.4 CaCu 2−x Ru x O 7−δ , (Tl,Pb)/Sr-1212, with 0.0 ≤ x ≤ 0.525 were synthesized by the conventional one-step solid-state reaction technique via a short time, using SrO 2 instead of SrCO 3 . X-ray powder diffraction XRD, scanning electron microscope SEM and the electrical resistivity measurements at different applied dc magnetic fields (0.0-4.4 kG) were performed in order to investigate the effect of Ru 4+ ions substitution on (Tl,Pb)/Sr-1212 phase. Enhancement of the phase formation, the superconducting transition temperature T c and the hole carriers concentration P was observed up to x = 0.075, and they decreased for further increase in x. The magnetoresistance data of these samples were analyzed within the thermally activated flux creep TAFC model and the Ambegaokar and Halperin AH theory. The derived flux pinning energy U , the critical current density J c (0) and the upper critical magnetic field B c2 (0) enhanced up to x = 0.075, beyond which they decreased for further increase in Ru-content. The coherence length at 0 K ζ(0) decreased up to x = 0.075 and increased with x > 0.075. In addition, we reported a comparison between the effect of Ru substitution on the physical properties for Gd-123, (Bi,Pb)-2223 and (Tl,Pb)/Sr-1212 phases.

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“…In these studies, it was found that doping of such impurities leads to a decrease in the critical temperature "T c ". The proposed reasons for the T c suppression after the substitution of impurity atoms in CuO 2 planes are magnetic pair breaking, potential scattering of carriers, localization of carriers and suppression of effective pairing interaction [15][16][17]. The magnetic ions Co, Ni and Fe produce the magnetic pair breaking and localization of carriers due the interaction between the Cooper pairs and the magnetic spins of the impurity atoms [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Suppression of Tc in Co-doped (Cu0.5Tl0.5)Ba2Ca2Cu3−xCoxO10−δ superconductor

Khan

Mumtaz

Ullah

et al. 2010

Journal of Alloys and Compounds

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Effect of 3d metal ion doping on the structure and superconductivity of (Tl0.5Pb0.5)Sr2CaCu2O7

Cited by 18 publications

References 49 publications

Ion Beam Analysis and Normal-State Conduction Mechanisms for (Bi, Pb)-2223 and (Tl, Pb)/Sr-1212 Superconducting Phases Substituted by Ruthenium

Ion Beam Analysis and Normal-State Conduction Mechanisms for (Bi, Pb)-2223 and (Tl, Pb)/Sr-1212 Superconducting Phases Substituted by Ruthenium

Synthesis, Characterization and Magnetoresistance Studies of Tl0.5Pb0.5Sr1.6Ba0.4CaCu2−x Ru x O7−δ Superconductor

Suppression of Tc in Co-doped (Cu0.5Tl0.5)Ba2Ca2Cu3−xCoxO10−δ superconductor

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