Voltage-current characteristics of the thallium-based ceramic superconductors

Özkan, H.; Topal, Uğur; Gasanly, Nizami; Albiss, B. A.; Kayed, Tarek S.

doi:10.1088/0953-2048/12/9/303

Cited by 8 publications

(10 citation statements)

References 15 publications

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“…Comparison of the β values of the present Tl-based samples with those of the previously investigated polycrystalline YBCO and BSCCO samples suggests that the Tl-based ones are the most sensitive to the applied magnetic field [3,11,12]. Our study shows that this sensitivity to magnetic field can be increased even more just by decreasing the pelletization pressure.…”

Section: Resultssupporting

confidence: 57%

“…Processing studies to date point out that the phases formed depend on the initial composition, the annealing treatment and Tl 2 O pressure [1,2]. For example, in our previous study, we observed that, while nearly single phase of Tl-2223 was formed when the initial composition was chosen as Tl 1.7 Ba 2 Ca 2.3 Cu 3 O 10-x , a mixture of Tl-2223 and Tl-2212 phases was observed for the initial composition of Tl 2 Ba 2 Ca 2 Cu 3 O 10-x [3]. We believe that pressure applied to form pellets, called pelletization pressure, preceding the sintering may improve the phase purity of target Tl phase.…”

Section: Introductionmentioning

confidence: 99%

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Influence of pelletization pressure on the structural and transport properties of TlCaBaCuO superconductors

Topal

2007

Physica Status Solidi (a)

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An investigation is reported of the effects of pelletization pressure on the structural and transport properties of polycrystalline TlCaBaCuO samples with nominal composition of Tl2Ba2Ca2Cu3O10–x . The measurements reveal the following interesting results as the pelletization pressure increases: (1) the volume fraction of self‐formed Tl‐2212 phase decreases and the amount of target Tl‐2223 phase increases; and (2) the links between grains become stronger. Consequently, energy dissipation on grain boundaries decreases and critical current increases. The paper also discusses the applicability of thallium samples as magnetic field sensors. It was found that the samples pelletized at low pressures become more sensitive to a magnetic field compared to those pelletized at high pressures. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Resultssupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Influence of pelletization pressure on the structural and transport properties of TlCaBaCuO superconductors

Topal

2007

Physica Status Solidi (a)

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“…The Tl-based HTS samples were prepared by the solidstate reaction method using Tl 2 O 3 , BaO 2 , CaO and CuO as outlined in a previous paper [12]. The micrographs of the pressed and sintered sample surfaces have regions in which the grains are elongated and closely intermixed together demonstrating some texture and preferred orientation.…”

Section: Methodsmentioning

confidence: 99%

“…In an earlier paper [12] we have reported the voltagecurrent characteristics of the Tl-based superconductors. This paper presents the effects of magnetic field and γ irradiation on the V -I characteristics, critical temperature and critical current of Tl-2212 and Tl-2223 superconductors near the 0953-2048/00/020161+04$30.00 © 2000 IOP Publishing Ltd transition temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of magnetic field and gamma irradiation on the electrical properties and structure of the Tl-based ceramic superconductors

Özkan¹,

Gasanly²,

Kayed³

2000

Supercond. Sci. Technol.

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The voltage-current (V -I ) characteristics, critical temperatures and the critical currents of Tl 2 Ba 2 CaCu 2 O 8 (Tl-2212) and Tl 2 Ba 2 Ca 2 Cu 3 O 10 (Tl-2223) ceramic superconductors were studied in magnetic fields up to 80 mT after several γ irradiations up to 100 MR. The effect of γ irradiation on the structure of these materials has also been studied. The normal state resistance increases by 20-30% with γ irradiation, most of the changes taking place in low γ doses up to 10 MR. The critical temperatures of Tl-2212 and Tl-2223 decrease by about 8 K up to 30 MR and approach the saturation values of 101 K and 113 K, respectively, with further increase of γ dose. For Tl-2212 in the 96-98 K temperature range the V -I behaviours become nearly ohmic under a γ dose of about 30 MR or in an external magnetic field of 20-30 mT. In the same temperature range the critical current decreases rapidly in low γ doses up to 10-25 MR; above that it decreases only slightly. For both materials, the positions and widths of the x-ray diffraction peaks almost remain the same but the peak intensities decrease by 10-40% with γ irradiation, the rate of decrease being higher in the 0-30 MR range. These observations indicate that drastic changes in the lattice do not take place with γ irradiation but substantial electronic excitations and point defects may be generated, at higher rate in low γ doses, to affect the concentration and arrangements of the carriers and the links between the grains.

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“…Note: BEDT-TTF is bis(ethylendithio)tetratiafulvalen and CNT(5,0) is a carbon nanotube with a chirality of (5,0 Ввиду того, что коэффициент прохождения прямо пропорционален туннельному току, полученная зависимость φ(D) (рис. 5) имеет прямую связь с вольтамперной характеристикой сверхпроводящих материалов и, как можно заметить, имеет вид схожий с экспериментальными измерениями в данной области, например, [13,14].…”

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Transmission coefficients of superconducting particles

Matasov

Dovmalov

Babyshkina

2021

Fine Chem. Technol.

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Objectives. There is no general theory of superconductivity capable of fully describing this phenomenon, which imposes its own difficulties in the search for new superconducting materials, as well as in the study of their properties. In particular, the electrodynamics of a superconducting system is unexplored. With the aim of a possible further description of the electrodynamics of superconductors, the temperature dependences of the energy parameters of a Cooper pair in the potential field of Abrikosov vortex were analyzed.Methods. The basis for the obtained results of the work was the consideration of the transmission coefficient for a superconducting particle in the approximation of the Wentzel– Kramers–Brillouin method, as well as the relationship between the critical temperature and the London penetration depth and the coherence length based on the model of plasmon destruction of the superconducting state.Results. The dependences of the lifetime of a particle in a potential well, penetration depth, frequency of impacts of a particle against a potential barrier, blurring of the energy level, transmission coefficient, and potential and kinetic energy of a particle on temperature were obtained. The characteristic values of these parameters were obtained at absolute zero for various cuprate, organic, and other superconducting materials. The dependences of the critical electric potential on temperature, as well as the London penetration depth, coherence length, and electric potential on the transmission coefficient at different temperatures were obtained. The form of the dependences qualitatively corresponds to the experimental data.Conclusions. The results obtained can be used to construct a general theory of superconductivity, describe the electrodynamics of a superconducting state, and develop new superconductors with higher critical currents.

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Voltage-current characteristics of the thallium-based ceramic superconductors

Cited by 8 publications

References 15 publications

Influence of pelletization pressure on the structural and transport properties of TlCaBaCuO superconductors

Influence of pelletization pressure on the structural and transport properties of TlCaBaCuO superconductors

Effect of magnetic field and gamma irradiation on the electrical properties and structure of the Tl-based ceramic superconductors

Transmission coefficients of superconducting particles

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