Critical currents of (Tl0.5Pb0.5)(Sr0.85Ba0.15)2Ca2Cu3Oz films on untextured silver substrates

Woch, W. M.; Zalecki, R.; Kołodziejczyk, Andrzej; Deinhofer, Christian; Gritzner, G.

doi:10.1016/j.jallcom.2006.10.172

Cited by 11 publications

(9 citation statements)

References 10 publications

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“…Therefore, we plotted the critical temperature versus critical current density and after extrapolation to zero critical current density we obtained the critical temperature value of 114.7 ÷ 0.3 K. The density of the critical current measured by transport method using 10 −6 V criterion was found to be 11.4 × 10 3 A/cm 2 at 77 K in the self field. This value is smaller than the value calculated from ac susceptibility data: 53 × 10 3 A/cm 2 at 77 K [9]. The measurements of the resistance as a function of the temperature for different dc magnetic fields for two orientations: H c and H ab are shown in Fig.…”

Section: Resultsmentioning

confidence: 62%

The Irreversibility Fields of (Tl_0.5Pb_0.5) (Sr_0.85Ba_0.15)₂Ca₂Cu₃O_zFilm on Polished Silver Substrate

et al. 2007

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Superconducting (Tl0.5Pb0.5)(Sr0.85Ba0.15)2Ca2Cu3Oz film was prepared on a highly polished, untextured silver substrate. A superconducting transition temperature (T c,50% ) of 114.7 ± 0.3 K was obtained from the resistance versus temperature measurements for different applied ac currents. The density of the critical current measured by transport method was found to be 11.4×10 3 A/cm 2 at 77 K in the self field. This value is smaller than the value calculated from ac susceptibility data: 53 × 10 3 A/cm 2 at 77 K. The magnetical broadening of the resistivity transition to the superconducting state was observed. The irreversibility fields of the thallium based film were obtained from magnetoresistive measurements for both parallel to the c-axis and parallel to the ab plane showing the anisotropy according to the magnetic field direction. The irreversibility fields as a function of temperature were successfully fitted by the power law.

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Section: Resultsmentioning

confidence: 62%

The Irreversibility Fields of (Tl_0.5Pb_0.5) (Sr_0.85Ba_0.15)₂Ca₂Cu₃O_zFilm on Polished Silver Substrate

et al. 2007

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“…This means that the pinning effect is a little smaller for the film on the silver substrate. Taking advantage of these parameters the critical current was calculated to be 11.4 × 10 3 A cm −2 at 77 K. This is considerably smaller than the critical current of 5.3 × 10 4 A cm −2 at 77 K obtained from the susceptibility measurement using Bean's model [7].…”

Section: Resultsmentioning

confidence: 63%

“…Extensive research on lead doped thallium superconductors (Tl-1223) showed that critical current densities in order of 10 6 A cm −2 may be achieved for Tl-1223 films on singlecrystalline lanthanum aluminate as a substrate [2][3][4][5]. Current investigation showed that c-axis oriented Tl-1223 films may also be prepared directly on silver substrates without any buffer layers by a two step preparation technique [6][7][8]. This method is based on the application of Tl-free precursor material onto the substrate by screen-printing, followed by a hightemperature thallination process.…”

Section: Introductionmentioning

confidence: 99%

Critical currents and magnetization of a (Tl_0.5Pb_0.5)(Sr_0.85Ba_0.15)₂Ca₂Cu₃O_zfilm on silver substrate

Woch

Tokarz

Zalecki

et al. 2009

Supercond. Sci. Technol.

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A thin film of a (Tl 0.5 Pb 0.5 )(Sr 0.85 Ba 0.15 ) 2 Ca 2 Cu 3 O z superconductor was prepared on highly polished silver substrates. Its superconducting transition temperature (T c,50% ) is 114.7 ± 0.3 K and the critical current density is 11.4 × 10 3 A cm −2 at 77 K in the self-field. The transport critical currents densities were measured as a function of temperature for several applied magnetic fields. The magnetization versus the dc applied magnetic field and temperature were also measured and the critical current densities were calculated. The temperature dependence of the critical currents obeys the Ginzburg-Landau power-law. Reasons for this behaviour were discussed taking into account the pinning force and anisotropy of the critical currents associated with the c-axis grain orientation of the film. The magnetization as a function of the angle between the applied magnetic field and the a-b plane showed a periodic dependence due to changes of the demagnetizing field.

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“…In our opinion it is time for a renaissance of the research on Tl-based compounds, because they may have the potential to combine the strengths of Y-123 and Bi-2212. They are crystallographically similar to the Bi-based HTS, and are known to have the tendency to establish a uniaxial texture when grown on untextured silver [18,19]. This fact fuels our hopes that Tl-based HTS coatings can successfully be grown on a concave metal surface.…”

Section: Choice Of Materialsmentioning

confidence: 86%

Thallium-based high-temperature superconductors for beam impedance mitigation in the Future Circular Collider

Calatroni

Putti

Vaglio

et al. 2017

Supercond. Sci. Technol.

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CERN has recently started a design study for a possible next-generation high-energy hadron–hadron collider (Future Circular Collider—FCC-hh). The FCC-hh study calls for an unprecedented center-of-mass collision energy of 100 TeV, achievable by colliding counter-rotating proton beams with an energy of 50 TeV steered in a 100 km circumference tunnel by superconducting magnets which produce a dipole field of 16 T. The beams emit synchrotron radiation at high power levels, which, to optimize cryogenic efficiency, is absorbed by a beam-facing screen, coated with copper, and held at 50 K in the current design. The surface impedance of this screen has a strong impact on beam stability, and copper at 50 K allows for a limited beam stability margin only. This motivates the exploration of whether high-temperature superconductors (HTS), the only known materials possibly having a surface impedance lower than copper under the required operating conditions, would represent a viable alternative. This paper summarizes the FCC-hh requirements and focuses on identifying the best possible HTS material for this purpose. It reviews in particular the properties of Tl-based HTS, and discusses the consequent motivation for developing a deposition process for such compounds, which should be scalable to the size of the FCC components.

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Critical currents of (Tl0.5Pb0.5)(Sr0.85Ba0.15)2Ca2Cu3Oz films on untextured silver substrates

Cited by 11 publications

References 10 publications

The Irreversibility Fields of (Tl_0.5Pb_0.5) (Sr_0.85Ba_0.15)₂Ca₂Cu₃O_zFilm on Polished Silver Substrate

The Irreversibility Fields of (Tl_0.5Pb_0.5) (Sr_0.85Ba_0.15)₂Ca₂Cu₃O_zFilm on Polished Silver Substrate

Critical currents and magnetization of a (Tl_0.5Pb_0.5)(Sr_0.85Ba_0.15)₂Ca₂Cu₃O_zfilm on silver substrate

Thallium-based high-temperature superconductors for beam impedance mitigation in the Future Circular Collider

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Critical currents of (Tl0.5Pb0.5)(Sr0.85Ba0.15)2Ca2Cu3Oz films on untextured silver substrates

Cited by 11 publications

References 10 publications

The Irreversibility Fields of (Tl0.5Pb0.5) (Sr0.85Ba0.15)2Ca2Cu3OzFilm on Polished Silver Substrate

The Irreversibility Fields of (Tl0.5Pb0.5) (Sr0.85Ba0.15)2Ca2Cu3OzFilm on Polished Silver Substrate

Critical currents and magnetization of a (Tl0.5Pb0.5)(Sr0.85Ba0.15)2Ca2Cu3Ozfilm on silver substrate

Thallium-based high-temperature superconductors for beam impedance mitigation in the Future Circular Collider

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The Irreversibility Fields of (Tl_0.5Pb_0.5) (Sr_0.85Ba_0.15)₂Ca₂Cu₃O_zFilm on Polished Silver Substrate

The Irreversibility Fields of (Tl_0.5Pb_0.5) (Sr_0.85Ba_0.15)₂Ca₂Cu₃O_zFilm on Polished Silver Substrate

Critical currents and magnetization of a (Tl_0.5Pb_0.5)(Sr_0.85Ba_0.15)₂Ca₂Cu₃O_zfilm on silver substrate