Correlation between distribution of outgrowths and microwave surface resistance for YBa2Cu3O7 thin films

Tian, Yongjun; Li, L.; Guo, Liang; Liu, J. Z.; Zhao, Zhongxian; Xu, Shifa; Lü, Huibin; Zhou, Yueliang; Chen, Z. H.; Cui, Daan; Yang, Ge

doi:10.1063/1.112744

Cited by 19 publications

(2 citation statements)

References 8 publications

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“…Furthermore, reduction in the of YBCO films might accompany improved nonlinear properties, for which extensive studies have been performed by many researchers [4], [5]. There have been reports that disorder [6], defects [7], outgrowths [8] films. However, to our knowledge, a definitive way to change the of YBCO films in a reproducible way is yet to be reported.…”

Section: Introductionmentioning

confidence: 97%

Effects of Proton Irradiation on the Microwave Surface Resistance of ${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-\delta}$ Films

Lee

Yang

Park

et al. 2007

IEEE Trans. Appl. Supercond.

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Proton irradiations on superconducting bulk materials and thin films have enabled to enhance the critical current density and the upper critical field in the mixed state due to increased vortex pinning. We investigated the microwave surface resistance ( ) of proton-irradiated YBa 2 Cu 3 O 7 (YBCO) films grown on LaAlO 3 (LAO) substrates. The intrinsic was measured at 8.5 GHz at temperatures of 7-90 K with the effects of the finite film thickness taken into account. Significant reduction in the of YBCO films were observed at temperatures of 40 K to 70 K when the films were irradiated with 20 MeV proton for 10 minutes to the fluence of 0 47 10 15 ions cm 2 with the value of 100 of the proton-irradiated one at 60 K appearing significantly lower than the corresponding one of 140 before irradiation. However, at temperatures below 20 K, the of the irradiated YBCO films was higher than that of the YBCO film before irradiation with the residual of the former appearing higher than that of the latter. No significant changes in the of YBCO films were observed when the films were irradiated with 20 MeV proton for 30-120 minutes to the fluences of 1 4 10 15 to 5 7 10 15 ions cm 2 . The reduction in the of proton-irradiated YBCO films at 40-70 K was attributed to enhanced impurity scattering rate of 2 10 12 s compared to a value of 7 6 10 11 s for unirradiated YBCO.

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Section: Introductionmentioning

confidence: 97%

Effects of Proton Irradiation on the Microwave Surface Resistance of ${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-\delta}$ Films

Lee

Yang

Park

et al. 2007

IEEE Trans. Appl. Supercond.

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“…In recent years a lot of studies, applied and fundamental, have been devoted to this subject. It was found out that YBCO film electrical properties can sufficiently depend on the following structural and phase inhomogeneities: boundaries of twins, grains and microblocks [2,3]; domains with high angle misorientation [4] and a-oriented domains [5]; domains with oxygen nonstoichiometric [6]; stacking faults [7]; cation disorder in the YBCO cell [8,9] and secondary phase particles [10]. It is obvious that for development of advanced techniques of high quality YBCO film preparation it is necessary to know how much each kind of inhomogeneity affects certain electrical parameters of films during optimization of deposition conditions.…”

Section: Introductionmentioning

confidence: 99%

Study of correlation between the microstructure and phase inhomogeneities of Y-Ba-Cu-O epitaxial films and their DC and microwave properties

Vorobiev

Drozdov

Гусев

et al. 1999

Supercond. Sci. Technol.

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The influence of various kinds of structure and phase inhomogeneity on electrical properties of YBCO thin films prepared by inverted cylindrical magnetron sputtering has been investigated. A simultaneous analysis of the changes in the microstructure and electrical parameters has allowed us to define the contribution of each kind of inhomogeneity in the restriction of the film's electrical parameters. It has been found that the transition temperature depends mainly on deviations of the c-axis lattice parameter from its optimum value, the critical current density depends mainly on the out of plane misorientation of the film domains and the microwave surface resistance depends mainly on the volume of the high-angle misoriented domains. By using atomic force and scanning tunnelling microscopy regions of YBCO films with modified properties around Cu-rich second phase particles were observed. It is suggested that superconducting properties of these regions are worse than the matrix due to Cu depletion. Usually the relative area of these inhomogeneities in our films is about 30% and can occupy up to 50% and, therefore, mostly determines the electrical properties of films. It is suggested that the processes of cation disorder deforming the film lattice play an important role in formation of structure and phase inhomogeneities in YBCO thin films.

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Correlation between microwave surface resistance, AC susceptibility and in-plane ordering in YBa2Cu3O7 thin films epitaxially grown on (100) MgO substrates

Castel

Guilloux-Viry

Перрин

et al. 1995

Physica C: Superconductivity

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Correlation between distribution of outgrowths and microwave surface resistance for YBa2Cu3O7 thin films

Cited by 19 publications

References 8 publications

Effects of Proton Irradiation on the Microwave Surface Resistance of ${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-\delta}$ Films

Effects of Proton Irradiation on the Microwave Surface Resistance of ${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-\delta}$ Films

Study of correlation between the microstructure and phase inhomogeneities of Y-Ba-Cu-O epitaxial films and their DC and microwave properties

Correlation between microwave surface resistance, AC susceptibility and in-plane ordering in YBa2Cu3O7 thin films epitaxially grown on (100) MgO substrates

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