Excess Conductivity and Superconducting Fluctuation Analysis of Cr-Substituted Tl-1223 Type Phase (Tl1−x Cr x )Ba2Ca2Cu3O9−δ (x = 0.4–0.8)

Ranjbar, Morteza; Abd‐Shukor, R.

doi:10.1007/s10948-016-3539-6

Cited by 7 publications

(3 citation statements)

References 18 publications

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“…where ρmeasured is the experimental resistivity value, ρbackground = α+βT and is the extrapolated resistivity at 0 K, α is the resistivity at 0 K, and β is the slope of the line. The excess conductivity theory and calculation were explained in an earlier paper [16].…”

Section: Introductionmentioning

confidence: 99%

“…It is generally known that the optimum valence of Cu for superconducting in the 1212 phase is 2.25+. Due to the Jahn Teller nature of Cu, which allows a high flexibility of the Cu-O apical distance, it is possible for Cr with higher valence to occupy the Tl 3+ site[16]. The possible ionic state in this samples are Sr 2+ , Cu 2+ , Cu 2+/3+ , Tl 3+ and Cr 3+/4+/5+ .…”

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confidence: 95%

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Effect of Cr Substitution on the Formation and Fuctuation-Induced Conductivity Analysis of (Tl1-xCrx)Sr2CaCu2O7 Superconductor

Ghazeian

Ghoranneviss

Abd‐Shukor

2019

SSP

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The (Tl1-xCrx)Sr2CaCu2O7 (Tl-1212) sample with nominal starting composition for x = 0.0, 0.2 and 0.3 were prepared by the solid-state reaction method. The samples were studied by powder x-ray diffraction method and electrical resistance versus temperature measurement. Excess conductivity analysis was carried out using the Aslamazov–Larkin (AL) theory, and the dimension of fluctuation-induced conductivity (λ) was determined. The Lawrence–Donaich (LD) theory was used to calculate the coherence length (ξc(0)), Josephson coupling (J), and γ = (ξab(0)/ξc(0)) of the superconductive samples. Excess conductivity analysis showed that Cr substitution induced 2D-to-3D conductivity transition at the highest transition temperature (T2D-3D) observed at x = 0.3. The calculations based on the Lawrence–Doniach model revealed that the shortest coherence length and weakest inter-plane coupling (J) occurred when x = 0.2. The sample with x = 0.2 and 0.3 showed the Tl-1212 as the major phase. The highest onset temperature of 110 K was observed in the x = 0.2 sample. Our result showed that the formal value of 2.3+ is more important than the Josephson interlayer coupling J in optimizing the transition temperature.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 95%

Effect of Cr Substitution on the Formation and Fuctuation-Induced Conductivity Analysis of (Tl1-xCrx)Sr2CaCu2O7 Superconductor

Ghazeian

Ghoranneviss

Abd‐Shukor

2019

SSP

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“…A large penetration depth λ of 10 3 -10 4Å [1], small coherence length ξ of 10Å [2], high anisotropy [3,4] as well as high critical temperatures considerably enhance the role of thermal fluctuations in high-temperature superconductors (HTS). After the discovery of HTS, papers treating thermal fluctuation problems appeared, in which the excess conductivity in the transition ranges for yttrium- [5][6][7], bismuth- [8,9], and thallium [10][11][12]-based superconductors was most often studied.…”

Section: Introductionmentioning

confidence: 99%

Electrical Conductivity and Magnetic Susceptibility of Thallium 1223-Based Superconductor in the Fluctuation Range

Woch

Zalecki

Giebułtowski

et al. 2018

J Supercond Nov Magn

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The paper reports on the temperature dependencies of the electrical resistivity and the a.c. magnetic susceptibility of the Tl 0.8 Bi 0.3 Sr 1.8 Ba 0.2 Ca 2 Cu 3 O x bulk superconductor measured in the area of the transition from the metallic to the superconducting state. From the resistivity data, the onset temperature T c,onset = 121.6 K, the critical temperature T c50% = 118.8 K, the zero resistance critical temperature obtained using E = 10 −6 V/cm criterion T c0 = 117.9 K, and the width of superconducting transition T = 1.6 K were derived. The thermal fluctuations were examined using the formulae for the conductance: σ = Kε −λ , and for the magnetic susceptibility:λ is the critical exponent, and K and C are constants. The critical exponents in the transition region from the normal to the superconducting state were determined and analyzed. The three-dimensional fluctuations were found to occur in the vicinity of the zero-resistance critical temperature.

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Study on excess conductivity in YBCO + xAg composites

2021

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Excess Conductivity and Superconducting Fluctuation Analysis of Cr-Substituted Tl-1223 Type Phase (Tl1−x Cr x )Ba2Ca2Cu3O9−δ (x = 0.4–0.8)

Cited by 7 publications

References 18 publications

Effect of Cr Substitution on the Formation and Fuctuation-Induced Conductivity Analysis of (Tl<sub>1-x</sub>Cr<sub>x</sub>)Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>7</sub> Superconductor

Effect of Cr Substitution on the Formation and Fuctuation-Induced Conductivity Analysis of (Tl<sub>1-x</sub>Cr<sub>x</sub>)Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>7</sub> Superconductor

Electrical Conductivity and Magnetic Susceptibility of Thallium 1223-Based Superconductor in the Fluctuation Range

Study on excess conductivity in YBCO + xAg composites

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