Properties of Hg cuprate thin films containing a mixture of Hg-1212 and Hg-1223 phases

Štrbı́k, V.; Chromík, Š.; Kleja, P.; Beňačka, Š.; Sin, A.

doi:10.1007/s10582-002-0038-8

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…The onset of superconducting transition (T ON ) depends usually on the amount of Hg-1223 phase (we believe that both Hg-1212 and Hg-1223 phases are nearly optimally oxygenated). For films composed only of pure Hg-1212 phase the onset temperature reached ∼130 K, whereas films with predominant Hg-1212, and 10-70% Hg-1223 phase volume contribution (including intergrowth phase), exhibited T ON at 135 K or above (see figure 4, inset) [22]. The maximum T c0 was obtained at 117-119 K for the films of different Hg-1223 content.…”

Section: Resultsmentioning

confidence: 98%

Long-term stability of Hg-based cuprate superconducting thin films prepared from a fluoride precursor

Štrbı́k

Plesch

Chromík

et al. 2002

Supercond. Sci. Technol.

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The long-term stability of superconducting properties of Hg-based cuprate thin films is presented. The mercury-based films were synthesized from an air-stable Ba-Ca-Cu-(O, F) precursor prepared by thermal evaporation from fluorides BaF 2 , CaF 2 and metallic Cu. The stability of the films prepared was studied using x-ray diffraction patterns and their electrical properties. The main features of superconducting transition (the onset and the midpoint temperature, as well as the width of transition) remained unchanged during 18 months, but the zero-resistivity critical temperature decreased from 117.5 K to 112 K (about 4%) due to an elongated low-resistivity tail. The good stability of the Hg-based cuprate thin films can be attributed to the dense character of our films that did not show any evident grain boundary morphology. Therefore, we assume that the main reason for the film degradation (as a rule localized at the grain boundaries) was eliminated.

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Section: Resultsmentioning

confidence: 98%

Long-term stability of Hg-based cuprate superconducting thin films prepared from a fluoride precursor

Štrbı́k

Plesch

Chromík

et al. 2002

Supercond. Sci. Technol.

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Effect of substrate’s nature on the growth of HgBCCO thin films

Barros

Ortéga

Peroz³

et al. 2006

Physica C: Superconductivity

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Soft x-ray studies of plasma-focus pinch structures in PF-1000U experiments

Sadowski

Paduch

Składnik‐Sadowska

et al. 2015

Plasma Sources Sci. Technol.

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This work reports on recent experiments performed at the modernized PF-1000U plasma-focus facility. In contrast to earlier studies the main attention was focussed on measurements of the soft x-ray emission. Detailed time-integrated x-ray measurements, carried out using filtered pinhole cameras with sensitive x-ray films, are presented and analysed. The fine structure of the collapsing current sheath and dense pinch column is investigated. Observations of 'plasma filaments' are discussed and compared with those from the old POSEIDON facility. New results are time-integrated x-ray images of PF-1000U discharges with additional gas puffing, which in many cases show distinct plasma filaments and/or 'hot spots' formed inside the dense pinch column. The formation of such 'hot-spots' is explained by necking and breaking of the plasma filaments. Results of time-resolved x-ray measurements, performed outside the experimental chamber by means of scintillation probes, and inside with PIN-diodes placed behind pinholes and absorption filters, are also presented Time-resolved measurements, carried out using an old XUV framing-camera and a new soft x-ray four-frame camera (SXRFFC), are also presented and discussed. Correlations of the time-integrated x-ray images (of plasma filaments and hot spots) with time-resolved x-ray signals are discussed. The hypothesis that plasma-current filaments appear in almost all PF-type discharges is supported by pictures of radial erosion tracks on the anode front-plate after many discharges.

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Properties of Hg cuprate thin films containing a mixture of Hg-1212 and Hg-1223 phases

Cited by 3 publications

References 7 publications

Long-term stability of Hg-based cuprate superconducting thin films prepared from a fluoride precursor

Long-term stability of Hg-based cuprate superconducting thin films prepared from a fluoride precursor

Effect of substrate’s nature on the growth of HgBCCO thin films

Soft x-ray studies of plasma-focus pinch structures in PF-1000U experiments

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