Superconducting TlSr2(Ca,Cr)Cu2O7 thin films with critical current density up to 106 A/cm2

Tang, Yongan; Chen, K. Y.; Chan, I. N.; Chen, Z. Y.; Shi, Yu; Salamo, Greg; Chan, F. T.; Sheng, Ζ. Z.

doi:10.1063/1.354440

Cited by 7 publications

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“…The total annealing time in static air was less than 1 h, which is 10 times shorter than the previously reported times [20]. More importantly, the annealing temperature window of 875-925…”

Section: Introductionmentioning

confidence: 80%

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Synthesis and characterization

Chen

Zhong

et al. 2014

High Performance Polymers

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Abstract. Growth of epitaxial Cr-doped (Tl,Bi)-1212 films on LaAlO 3 substrates by pulsed laser deposition (PLD) and post-deposition annealing in static air has been achieved. The films exhibit a high transport J c of over 1.5 × 10 6 A cm −2 at 77 K and self-field. T c values measured by the four-probe method are in the range 94-100 K. ICP emission spectroscopy measurement shows a thallium deficiency, with about 0.15 atom bismuth per formula in the film. XRD θ-2θ, φ and ω scans show that the dominant phase is 1212, with excellent epitaxy. The film surface has typical PLD morphology as analysed by SEM. TEM analysis found some inclusions in the film, and HREM found that three 1201 layers exist between the interface of 1212 phase and substrate.

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“…The total annealing time in static air was less than 1 h, which is 10 times shorter than the previously reported times [20]. More importantly, the annealing temperature window of 875-925…”

Section: Introductionmentioning

confidence: 80%

“…• C for 15-20 h in the presence of Tl 1.3 Sr 2 CaCr 0.2 Cu 2 O z pellets [19,20]. The annealed film had T c values in the range 98-102 K and J c approaching 1 × 10 6 A cm −2 at 77 K, measured by a selfinductance method.…”

Section: Introductionmentioning

confidence: 99%