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Your search keyword '"Zhao, Xin-Jie"' showing total 9 results
Start Over Author "Zhao, Xin-Jie" Journal chinese physics b
9 results on '"Zhao, Xin-Jie"'

5. Formation of epitaxial Tl2Ba2Ca2Cu3O10superconducting films by dc-magnetron sputtering and triple post-annealing method

Author

Ge De-Yong, Liu Xin, Zhang Xu, Wang Pei, Du Jia-Nan, He Ming, Gao Xiao-Xin, Hu Lei, Zhao Xin-Jie, Song Feng-Bin, Ji Lu, and Xie Wei

Subjects
Superconductivity, Argon, Materials science, chemistry, Annealing (metallurgy), Sputtering, Scanning electron microscope, Transition temperature, Analytical chemistry, General Physics and Astronomy, chemistry.chemical_element, Sputter deposition, Epitaxy
Abstract

For obtaining pure phase Tl2Ba2Ca2Cu3O10 (Tl-2223) films with good superconducting properties, the growth technique is improved by dc magnetron sputtering and a triple post-annealing process. The triple post-annealing process comprises annealing twice in argon and once in oxygen at different temperatures. In the first low-temperature annealing phase in argon, Tl2Ba2CaCu2O8 (Tl-2212) is obtained to effectively minimize evaporation in the next step. With the increase of temperature in the second annealing stage in argon, the previously prepared Tl-2212 inter-phase is converted into Tl-2223 phase. An additional annealing in oxygen is also adopted to improve the properties of Tl-2223 films, each containing an optimal oxygen content value. The results of X-ray diffraction (XRD) θ–2θ scans, ω scans and rotational scans show that each of the Tl-2223 films has a high phase purity and an epitaxial structure. Smooth films are observed by scanning electron microscopy (SEM). The critical temperatures Tc of the films are measured to be about 120 K and the critical current densities Jc can reach 4.0 MA/cm2 at 77 K at self field.

Published
2014

9. Energy gap suppression and excess current in Tl2Ba2CaCu2O8 intrinsic Josephson junctions.

Author

Wang Pei, Xie Wei, Hu Lei, Liu Xin, Zhao Xin-Jie, He Ming, Ji Lu, Zhang Xu, and Yan Shao-Lin

Subjects
JOSEPHSON junctions, THIN films, LIQUID nitrogen, ELECTRIC potential, BAND gaps, NONEQUILIBRIUM flow, QUASIPARTICLES
Abstract

Intrinsic Josephson junctions in misaligned Tl2Ba2CaCu2O8 thin film were fabricated on LaAlO3 substrate. The temperature dependence of the critical current is investigated around liquid nitrogen temperature. In the current voltage characteristic, large voltage jump and lack of resistive branch are observed, which shows good consistency with the intrinsic Josephson junctions. By analyzing the large gap voltage in the curve, great suppression of the energy gap is found. Through discussing the temperature dependence of the gap voltage in liquid nitrogen temperature, it is shown that this phenomenon can be caused by the non-equilibrium quasiparticle injection. The temperature influence on the excess current also confirms the non-equilibrium effect. [ABSTRACT FROM AUTHOR]

Published
2013
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