The Effect of K Substitution on Magnetoresistivity and Activation Energy of Bi-2212 System

Özçelık, Bekir; Yalaz, E.; Yakıncı, M. E.; Sotelo, A.; Madre, M. A.

doi:10.1007/s10948-014-2672-3

Cited by 8 publications

(3 citation statements)

References 39 publications

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“…Tc increases significantly when the Bi and Ca content is decreased, provided that the oxygen content is constant [3]. Since their discovery many experiments have been performed to better understand their structural and physical properties of the system, and to improve their critical temperature (Tc) and critical current density (Jc) [4][5][6][7][8][9][10][11][12][13][14][15][16][17], as it is considered as one of the most promising materials for technological applications. Besides, BSCCO superconductors have some advantages as high critical temperature and magnetic field carrying capacity, they also have some disadvantages like the weak-links, high anisotropy, and small coherence length.…”

Section: Introductionmentioning

confidence: 99%

Improvement of structural and superconducting properties of Bi-2212 textured rods by substituting sodium

Nane

Özçelık

Amaveda

et al. 2016

Ceramics International

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In this study, the physical and superconducting properties of Bi 2 Sr 2 Ca 1-x Na x Cu 2 O 8+ (x=0.0, 0.05, 0.075 0.1, and 0.20) textured superconducting rods prepared by a laser floating zone technique were presented. The effect of Na +1 substitution for Ca 2+ has been investigated by Xray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, transport measurements, dc-magnetization, magnetic hysteresis and magnetic critical current density. The powder XRD patterns of samples have shown that Bi-2212 phase is the major one, independently of Na content. Transport measurements indicate that, in general, the transport critical current density of samples is increased by Na substitution compared with the pure sample. In all cases, a good orientation of grains with the growth axis was observed in microstructural studies. The best critical temperature, T C , was found as 93.3 K for the sample with 0.75Na substitution, under a DC magnetic field of 50 Oe in ZFC mode. It was also observed that the magnetic critical current density obtained from magnetic hysteresis curves by using the critical Bean's model, increases with increasing Na-substitution. The maximum magnetic J C value was determined as 1.35x10 5 A/cm 2 at 10 K for the 0.10Na sample. The maximum transport critical current density was directly measured as 1.3x10 3 A/cm 2 at 77 K for the 0.05Na sample.

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Section: Introductionmentioning

confidence: 99%

Improvement of structural and superconducting properties of Bi-2212 textured rods by substituting sodium

Nane

Özçelık

Amaveda

et al. 2016

Ceramics International

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“…It can also be seen from these graphs that the transition temperatures shift to lower temperatures by increasing the applied magnetic field with the decrease in the pinning intensity in the samples. 22 When no magnetic field is applied to superconductors for resistivity measurements, the transition from the normal state to the superconducting state is usually sharp and therefore the transition width is very narrow. This is because pinning effects are dominant in superconductors, although the fluctuating effects are insignificant.…”

Section: Magnetoresistivity Measurementsmentioning

confidence: 99%

Research of both γ‐irradiation and La₂O₃ addition on structural and magnetoresistivity of Bi‐2223 bulk superconductors

Ağıl

Ozoglu

2021

Int J Applied Ceramic Tech

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Since Bi-based superconductors were discovered by Maeda et al. 1 interest in large-scale technical applications and scientific research has increased significantly. BiSrCaCuO (BSCCO) high-temperature superconductor contains three phases with the general formula Bi 2 Sr 2 Ca n−1 Cu n O 2n+4+δ .Here n = 1 (Bi-2201), 2 (Bi-2212), and 3 (Bi-2223) represent the number of CuO 2 layers and have critical temperatures of 20, 85, and 110 K, respectively. 1,2 Bi-2223 compound is preferred over others because of its high critical temperature (T c ). Researchers have made great efforts to improve the key properties of this compound, such as its transition temperature, magnetic field carrying capacity, and high critical current density. 3 The biggest obstacle to the use of this compound in applications is weak intergranular bonds and poor flux pinning ability. Different methods such as adding impurity phases, 4-6 ion irradiation column defects, 7,8 point defects caused by oxygen deficiency, 9 to prevent hysteresis chemical substitution or magnetic nanoparticle addition, 10-13 etc. in order to increase the pinning characteristic of Bi-2223. It is a well-known method to create defects with various irradiations in the material to improve the superconducting properties of Bi-2223. These particles disrupt the crystal lattice of the material and create effective pinning centers that increase the critical current density of the Bi-2223 superconductor. [14][15][16][17][18][19] In a study reported by Zhao et al. 15 it was observed that the zero resistance temperatures (T zero c ) of Bi-based bulk superconducting materials exposed to gamma irradiation at certain intensities and durations first increased slightly and then gradually decreased. The authors stated that there are two reasons for this behavior to occur with gamma irradiation. The first one is the increase in the T zero c as a result of the energy gap becoming higher than normal state by linking the excited electrons and holes to the superconducting carriers. Then, the reason for the decrease in T zero c is

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“…TAFC was first pointed out by Anderson [14], at which creep involves bundles of flux lines hopping over the pinning barriers due to the thermal activation although Lorentz force exerted on the flux bundle by the current is smaller than the pinning force. Several researchers have pointed out that the TAFC model is the best model for describing the electrical resistivity broadening data under applied magnetic field for various phases of Bi-based superconductors [20][21][22][23][24][25][26][27][28]. Ambegaokar and Halperin's theory is another approach to study the flux line motion under applied magnetic field [29].…”

Section: T Tmentioning

confidence: 99%

Magnetoresistivity studies for BiPb-2223 phase added by BaSnO3 nanoparticles

Barakat

Habanjar

2017

J Adv Ceram

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Co-precipitation method and conventional solid-state reaction technique were used to synthesize BaSnO 3 nanoparticles and (BaSnO 3 ) x /Bi 1.6 Pb 0.4 Sr 2 Ca 2 Cu 3 O 10+δ (0 ≤ x ≤ 1.50 wt%) samples, respectively. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and electrical resistivity data were used to characterize BiPb-2223 phase added by BaSnO 3 nanoparticles. The relative volume fraction and superconducting transition temperature T c of BiPb-2223 phase were enhanced by increasing BaSnO 3 addition up to 0.50 wt%. These parameters were decreased with further increase of x. The resistive transition broadening under different applied DC magnetic fields (0.29-4.40 kG) was analyzed through thermally activated flux creep (TAFC) model and Ambegaokar-Halperin (AH) theory. Improvements of the derived flux pinning energy U, critical current density J c (0) estimated from AH parameter C(B), and upper critical magnetic field c2 (0) B , were recorded by adding BaSnO 3 nanoparticles up to 0.50 wt%, beyond which these parameters were suppressed. The magnetic field dependence of the flux pinning energy and critical current density decreased as a power-law relation, which indicated the single junction sensitivity between the superconducting grains to the applied magnetic field. Furthermore, the increase in the applied magnetic field did not affect the electronic thermal conductivity e  above the superconducting transition temperature and suppressed it below T c .

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The Effect of K Substitution on Magnetoresistivity and Activation Energy of Bi-2212 System

Cited by 8 publications

References 39 publications

Improvement of structural and superconducting properties of Bi-2212 textured rods by substituting sodium

Improvement of structural and superconducting properties of Bi-2212 textured rods by substituting sodium

Research of both γ‐irradiation and La₂O₃ addition on structural and magnetoresistivity of Bi‐2223 bulk superconductors

Magnetoresistivity studies for BiPb-2223 phase added by BaSnO3 nanoparticles

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The Effect of K Substitution on Magnetoresistivity and Activation Energy of Bi-2212 System

Cited by 8 publications

References 39 publications

Improvement of structural and superconducting properties of Bi-2212 textured rods by substituting sodium

Improvement of structural and superconducting properties of Bi-2212 textured rods by substituting sodium

Research of both γ‐irradiation and La2O3 addition on structural and magnetoresistivity of Bi‐2223 bulk superconductors

Magnetoresistivity studies for BiPb-2223 phase added by BaSnO3 nanoparticles

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Research of both γ‐irradiation and La₂O₃ addition on structural and magnetoresistivity of Bi‐2223 bulk superconductors