Normal-state Hall effect measurements for Tl0.8Hg0.2Ba2Ca2Cu3O9−δ substituted by Sm and Yb

Awad, R.; Abou‐Aly, A. I.; Ibrahim, I. H.; Abdeen, W.

doi:10.1016/j.ssc.2007.12.029

Cited by 12 publications

(4 citation statements)

References 22 publications

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“…The suppression in T c as Sm-content increases is related to the hole filling mechanism. This suppression in T c is consistent with the reduction of hole-concentration as the Sm-content increases [13]. The variation of T c deduced from ac susceptibility measurements is in a good agreement with that obtained from the resistivity measurements within a difference of about ±2 K. Generally the T c values determined from the resistivity occur at somewhat higher temperatures than those determined from susceptibility measurements.…”

Section: Samples Investigationsupporting

confidence: 85%

“…HgBa 2 Sm 0.5 Ca 0.5 Cu 2 O 6+ı , had a broad superconducting transition with T c = 115 K. The low superconducting volume fraction of this sample indicates that the diamagnetic signal stems from more calcium-rich crystallites. Awad et al [13] studied the normal-state Hall effect for Tl 0.8 Hg 0.2 Ba 2 Ca 2−x R x Cu 3 O 9−ı , where R = Sm and Yb with 0 ≤ x ≤ 0.15, above T c . They found that the Hall coefficients R H are positive and follow the Curie-Weiss temperature dependence type.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Sm-substitution on the electrical and magnetic properties of (Tl0.8Hg0.2)-1223

Abou‐Aly¹,

Awad²,

Ibrahim³

et al. 2009

Journal of Alloys and Compounds

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Section: Samples Investigationsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Effect of Sm-substitution on the electrical and magnetic properties of (Tl0.8Hg0.2)-1223

Abou‐Aly¹,

Awad²,

Ibrahim³

et al. 2009

Journal of Alloys and Compounds

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“…dρ/dT value increases as x increases, followed by a decrease in its value to be negative at x = 0.4 and x ≥ 0.3 for (Bi, Pb)-2223 and (Tl, Pb)/Sr-1212 phases, respectively. The increase in dρ/dT is attributed to the decrease in the carrier concentration [39], or due to an unsuspected temperature dependent scattering contribution by Ru center. The variation of T c with Ru-content is also listed in Table 6 for each phase.…”

Section: Resultsmentioning

confidence: 99%

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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“…Based on the XRD scans, the distinct and sharp diffraction peaks observed are in excellent agreement with the tetragonal structure of the (Tl, Hg)-1223 phase, characterized by the P4/mmm space group. These peaks dominate over any impurities or alternative superconducting phases present in the samples [22]. The existence of secondary low-intensity peaks indicates the presence of impurity phases, such as the (Tl, Hg)-1212 phase, BaHgO 2 , BaCuO 2 , and CaHgO 2 [23].…”

Section: Sample Investigationmentioning

confidence: 98%

Superconducting and Mechanical Properties of the Tl0.8Hg0.2Ba2Ca2Cu3O9−δ Superconductor Phase Substituted by Lanthanum and Samarium Fluorides

Khattar,

Anas,

Awad

et al. 2023

Condensed Matter

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This study investigated the impact of samarium and lanthanum fluorides (SmF3 and LaF3) on the physical and mechanical properties of Tl0.8Hg0.2Ba2Ca2−xRxCu3O9−δ−yFy superconducting phases (specifically the (Tl, Hg)-1223 phase), where R = Sm and La, with 0.00 ≤ x ≤ 0.10. The superconducting samples were synthesized using the solid-state reaction method. X-ray diffraction (XRD) verified the formation of the (Tl, Hg)-1223 phase without altering its tetragonal structure. Scanning electron micrographs (SEM) reveal the improvement of the grain size and inter-grain connectivity as Sm and La contents increased up to x=0.025. The electrical properties of (Tl, Hg)-1223 were studied using I-V and electrical resistivity measurements. Improved superconducting transition temperature (Tc) and transport critical current density (Jc) were observed up to x=0.025, beyond which they decreased substantially. Vickers microhardness (Hv) measurements were performed at room temperature to investigate their mechanical performance with various applied loads (0.49–9.80 N) and times (10–90 s). For both substitutions, the mechanical properties were enhanced up to an optimal value at x=0.025. All samples exhibited normal indentation size effect (ISE) behavior. The proportional sample resistance (PSR) model best explained Hv values among five theoretical models. Dislocation creep was the primary creep mechanism in the samples, according to indentation creep studies.

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Normal-state Hall effect measurements for Tl0.8Hg0.2Ba2Ca2Cu3O9−δ substituted by Sm and Yb

Cited by 12 publications

References 22 publications

Effect of Sm-substitution on the electrical and magnetic properties of (Tl0.8Hg0.2)-1223

Effect of Sm-substitution on the electrical and magnetic properties of (Tl0.8Hg0.2)-1223

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

Superconducting and Mechanical Properties of the Tl0.8Hg0.2Ba2Ca2Cu3O9−δ Superconductor Phase Substituted by Lanthanum and Samarium Fluorides

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