Excess conductivity analysis for Tl0.8Hg0.2Ba2Ca2Cu3O9−δ substituted by Sm and Yb

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

doi:10.1016/j.ssc.2008.12.003

Cited by 44 publications

(10 citation statements)

References 34 publications

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“…Also, The Hall angle cot Â H increases as the temperature increases, and this is supported by the non-Fermi-liquid model [14]. Also, the fluctuation conductivity analysis for the same samples was reported by Abou-Aly et al [15]. The data showed that the fluctuation conductivity analysis exhibits five different fluctuation regions namely critical, three dimensional, two dimensional, one dimensional and short wave fluctuations.…”

Section: Introductionsupporting

confidence: 74%

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: Introductionsupporting

confidence: 74%

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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“…To study the zero-field fluctuation conductivity, excess conductivity ( σ/σ ) versus temperature is plotted as shown in figure 6. The zero fluctuation conductivity is studied through a 2D and 3D Aslamazov-Larkin (AL) model [18,28,29]. Aslamazov-Larking theory predicts that…”

Section: Resultsmentioning

confidence: 99%

“…where σ 0 is the conductivity extrapolated from the normal conductivity, T c is the mean-field superconducting transition, t is the reduced temperature (T − T c /T c ), A is the temperatureindependent amplitude and α is the conductivity exponent, which should be −0.5 for the three-dimensional and −1 for the two-dimensional nature of fluctuations [18,28,29]. The conductivity exponent is estimated by fitting a straight line for ln ( σ/σ ) versus ln(T − T c /T c ).…”

Section: Resultsmentioning

confidence: 99%

Magneto-transport studies of FeSe_{0.9 −x}M_x(M = Si, Sb)

Pandya

Sherif

Chandra

et al. 2011

Supercond. Sci. Technol.

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We report on the magneto-resistivity of FeSe 0.9−x M x (M = Si, Sb, x = 0.05, 0.1) down to 2 K in the presence of magnetic fields up to 14 T. The superconducting transition shows marginal differences for Sb-and Si-doped samples. Normal state resistivity shows marked changes at intermediate temperatures around 100 K, signaling the presence of a structural transition. It also shows linear behavior with temperature, reminiscent of high T c ceramics. Superconducting parameters like critical fields and coherence lengths are quantified for all samples. The broadening of superconducting transitions is studied through thermally activated flux flow (TAFF) and fluctuation conductivity. The activation energy of these superconductors is found to be one order smaller than the FeAs-1111 system, which may be explained in terms of larger penetration depth. The activation energy of thermally activated flux flow decreases with the Si and Sb doping and is explained by Kramer's scaling for grain boundary pinning. The zero-field and magnetic-field-induced fluctuation conductivity are studied using Aslamazov-Larkin (AL) and lowest Landau level (LLL) theories, respectively. Zero-field fluctuation conductivity shows the 2D to 3D crossover just above the mean-field transition and 3D LLL scaling is obtained near mean-field transitions for magnetic-field-induced fluctuation conductivity. This is a clear indication of the three-dimensional nature of these superconductors. The 3D nature of these superconductors signifies its potential for future technological applications.

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“…The room temperature electrical resistivity room ρ , residual resistivity o ρ and resistivity temperature coefficient β for different x wt% are listed in Table 4. It is well known that room ρ is an indicator for the disorder of cations and Oxygen vacancies which increase the number of scattering centers [36] [37]. The superconducting transition temperature T c , which displays the superconducting transition within the grains, is determined as the temperature corresponding to the crest in dρ/dT curve [38].…”

Section: Resultsmentioning

confidence: 99%

Ion Beam Analysis and Electric Properties of GdBa2Cu3O7-δ Added with Nanosized Ferrites ZnFe2O4 and CoFe2O4

Basma¹,

Roumié²,

Awad³

et al. 2015

MSA

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In this study, superconducting samples of type GdBa2Cu3O7−δ added with x wt% (0 ≤ x ≤ 0.4) nanoferrites ZnFe2O4 and CoFe2O4 were prepared by the conventional solid-state reaction technique. The prepared samples were characterized using X-ray powder diffraction (XRD) in order to determine the volume fraction and lattice parameters. The elemental contents of the prepared samples were determined using particle induced X-ray emission (PIXE). In addition, the oxygen-content of these samples was obtained using non-Rutherford backscattering spectroscopy (RBS) at 3 MeV proton beam. It is found that the Oxygen-content of GdBa2Cu3O7−δ phase remains practically constant for low additions of both nanoferrites but it increases with high additions. The electrical resistivity of the prepared samples was measured by the conventional four-probe technique from room temperature down to the zero superconducting transition temperature (T0). An increase in the superconducting transition temperature Tc and the critical current density Jc is observed as x varies from 0.0 to 0.06 wt% of (ZnFe2O4)xGdBa2Cu3O7−δ, followed by a systematic decrease with increasing x. On the other hand, the Tc values for (CoFe2O4)xGdBa2Cu3O7−δ show a systematic decrease with x for both high and low additions while Jc is enhanced up to x = 0.01 wt% and decrease with further increase in x.

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Excess conductivity analysis for Tl0.8Hg0.2Ba2Ca2Cu3O9−δ substituted by Sm and Yb

Cited by 44 publications

References 34 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

Magneto-transport studies of FeSe_{0.9 −x}M_x(M = Si, Sb)

Ion Beam Analysis and Electric Properties of GdBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-δ</SUB> Added with Nanosized Ferrites ZnFe<SUB>2</SUB>O<SUB>4</SUB> and CoFe<SUB>2</SUB>O<SUB>4</SUB>

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Excess conductivity analysis for Tl0.8Hg0.2Ba2Ca2Cu3O9−δ substituted by Sm and Yb

Cited by 44 publications

References 34 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

Magneto-transport studies of FeSe0.9 −xMx(M = Si, Sb)

Ion Beam Analysis and Electric Properties of GdBa&lt;SUB&gt;2&lt;/SUB&gt;Cu&lt;SUB&gt;3&lt;/SUB&gt;O&lt;SUB&gt;7-δ&lt;/SUB&gt; Added with Nanosized Ferrites ZnFe&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;4&lt;/SUB&gt; and CoFe&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;4&lt;/SUB&gt;

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Magneto-transport studies of FeSe_{0.9 −x}M_x(M = Si, Sb)

Ion Beam Analysis and Electric Properties of GdBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-δ</SUB> Added with Nanosized Ferrites ZnFe<SUB>2</SUB>O<SUB>4</SUB> and CoFe<SUB>2</SUB>O<SUB>4</SUB>