Polycrystalline (Tl0.5Pb0.5)(Sr0.9Ba0.1)2Ca2Cu3Oy superconducting thick films with high critical current densities

Heiml, O.; Gritzner, G.

doi:10.1088/0953-2048/15/6/321

Cited by 26 publications

(28 citation statements)

References 19 publications

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“…Unique properties of superconducting devices like an extremely small energy consumption and a picosecond range switching speed force to develop so-called superconductor digital (737) electronics which can also use thallium base HTS [2]. The wide researches on lead doped thallium superconductors (Tl-1223) showed that critical current densities of more than 10 6 A/cm 2 may be achieved for Tl-1223 films on single-crystalline lanthanum aluminate as substrate [3][4][5][6]. Current investigation showed that c-axis oriented Tl-1223 films may also be prepared on silver [7,8] by a two-step preparation technique.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…The film was prepared using screen printing method and the details of preparation and structural analysis are described in the papers [2,9]. The X-ray diffraction showed the high purity of the sample and tetragonal structure.…”

Section: Resultsmentioning

confidence: 99%

Analysis of Resistive Superconducting Transition of a (Tl_0.6Pb_0.24Bi_0.16)(Ba_0.1Sr_0.9)₂Ca₂Cu₃O_yFilm

2010

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In this paper we analyze the resistive transition as a function of both the temperature and the dc applied magnetic field. We use the two models: first, based on the Ambegaokar and Halperin theory that describes the resistive transitions by the modified Bessel function and second, based on the Anderson and Kim theory represented by the exponential formula. The fits of the models to experimental results show that the freezing into superconducting vortex-glass phase takes place at the same temperature that does not practically depend on the applied magnetic field. IntroductionThe resistive transition from a normal to the superconducting state of high temperature superconductors (HTS) is always significantly broadened as compared to the low temperature superconductors, especially, when the applied magnetic field and/or the flowing current is present. The field-broadened resistive transition may be described by the following equation [1,2]:where the width of the resistive transition was usually defined by the formula: ∆T = T 90% − T 10% . The value of m should be 2/3, but was found to depend on some properties of a superconductor. ∆T 0 is the width of the resistive transition at zero applied magnetic field and the coefficient C depends on the critical current at zero magnetic field and on the critical temperature.The measurements of the width and the shape of the resistance transition of the HTS give insight into the flux pinning properties. From these measurements one can extract such parameters of the vortex dynamics as activation energy and frequency of flux creep [3]. Koch et al. showed [4] that in epitaxial films there is a second-order phase transition between a normal and a superconducting state at a well defined temperature T g called the freezing temperature into the superconducting vortex-glass state.In this paper we fitted the resistive transition as a function of both the temperature and the applied magnetic field of a (Tl 0.6 Pb 0.24 Bi 0.16 )(Ba 0.1 Sr 0.9 ) 2 Ca 2 Cu 3 O y superconducting film on single-crystalline lanthanum aluminate substrate, using the two models: first, based on the Ambegaokar and Halperin theory [3,5] that describes the resistive transitions by the modified Bessel function

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“…Samples 1 and 2 were prepared by screen printing thallium-free precursor material on monocrystalline (100) lanthanum aluminate substrates followed by ex situ thallination. The preparing procedures are described in earlier papers [1,2,5,6]. The resulting films were quasi-monocrystalline with high ab alignment and c-axis orientation and of high purity.…”

Section: Methodsmentioning

confidence: 99%

“…Within last years considerable progress in improving electrical transport properties in such films was made. High-purity, well aligned Tl-1223 based superconducting films with critical current densities close to 10 6 A cm −2 were already produced [1,2]. Superconducting films are very convenient for application of the electric transport methods in the critical current investigations due to their small cross-section -they do not need large currents for such measurements.…”

Section: Introductionmentioning

confidence: 99%

Temperature and Magnetic Field Dependences of Critical Current of Thallium-Based Superconducting Films

et al. 2006

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Polycrystalline (Tl0.5Pb0.5)(Sr0.9Ba0.1)2Ca2Cu3Oy superconducting thick films with high critical current densities

Cited by 26 publications

References 19 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

Analysis of Resistive Superconducting Transition of a (Tl_0.6Pb_0.24Bi_0.16)(Ba_0.1Sr_0.9)₂Ca₂Cu₃O_yFilm

Temperature and Magnetic Field Dependences of Critical Current of Thallium-Based Superconducting Films

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Polycrystalline (Tl0.5Pb0.5)(Sr0.9Ba0.1)2Ca2Cu3Oy superconducting thick films with high critical current densities

Cited by 26 publications

References 19 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

Analysis of Resistive Superconducting Transition of a (Tl0.6Pb0.24Bi0.16)(Ba0.1Sr0.9)2Ca2Cu3OyFilm

Temperature and Magnetic Field Dependences of Critical Current of Thallium-Based Superconducting Films

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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

Analysis of Resistive Superconducting Transition of a (Tl_0.6Pb_0.24Bi_0.16)(Ba_0.1Sr_0.9)₂Ca₂Cu₃O_yFilm