The formation of two-layered YBa2Cu3O7- deltasuperconducting films and their microwave surface resistance

Karmanenko, S. F.; Davydov, V. Yu.; Белоусов, М. В.; Chakalov, R. A.; Dzjuba, G O; Il'in, R. N.; Kozyrev, A. B.; Likholetov, Yu V; Njakshev, K F; Serenkov, I. T.; Vendik, O. G.

doi:10.1088/0953-2048/6/1/002

Cited by 21 publications

(13 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Films of YBa 2 Cu 3 O 7−δ were grown by dc magnetron sputtering 17 on LaAlO 3 substrates. X-ray and Raman spectroscopy analysis confirmed that the films were caxis oriented and of a high structural perfection.…”

Section: Experimental a Sample Preparationmentioning

confidence: 99%

Magneto-optical study of magnetic-flux penetration into a current-carrying high-temperature-superconductor strip

et al. 1999

View full text Add to dashboard Cite

Magnetic flux distribution across a high-temperature superconductor strip is measured using magneto-optical imaging at 15 K. Both the current-carrying state and the remanent state after transport current are studied up to the currents 0.97Ic where Ic is the critical current. To avoid overheating of the sample current pulses with duration 50 ms were employed. The results are compared with predictions of the Bean model for the thin strip geometry. In the current-carrying state, reasonable agreement is found. However, there is a systematic deviation -the flux penetration is deeper than theoretically predicted. A much better agreement is achieved by accounting for flux creep as shown by our computer simulations. In the remanent state, the Bean model fails to explain the experimental results. The results for the currents I ≤ 0.7Ic can be understood within the framework of our flux creep simulations. However, after the currents I > 0.7Ic the total flux trapped in a strip is substantially less than predicted by the simulations. Furthermore, it decreases with increasing current. Excessive dissipation of power in the annihilation zone formed in the remanent state is believed to be the source of this unexpected behavior.

show abstract

Section: Experimental a Sample Preparationmentioning

confidence: 99%

Magneto-optical study of magnetic-flux penetration into a current-carrying high-temperature-superconductor strip

et al. 1999

View full text Add to dashboard Cite

show abstract

“…7 This epitaxial technique ensures that no thermal resistance exists between these two materials. The thickness of the HTSC film was 0.2 m. Microbridges were fabricated using lithography followed by wet-etching techniques.…”

Section: B Microbridgementioning

confidence: 99%

Measurement and simulation of temperature dynamics under electron beam

Babin

Gaevski

Konnikov

2001

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

View full text Add to dashboard Cite

Magnesium diboride nanobridges fabricated by electron-beam lithographyThermal diffusivity measurements of sub-micron organic dye thin films using a high temperature superconductor bolometer Appl.An original in situ technique was developed to measure the temperature rise and decay of a material under electron-beam ͑e-beam͒ irradiation. The technique uses the effect of temperature rise on the electrical conductivity of high-temperature superconductors that are prefabricated as microbridges. This temperature sensor was measured to have a sensitivity greater than two orders of magnitude more than a thin-film thermocouple. A stroboscopic technique ensured nanosecond temporal resolution, and the size of the microbridge allowed for micrometer-scale spatial resolution. These measurement ranges are important for practical e-beam lithography. Experimental results were compared with results simulated by the TEMPTATION ͑temperature simulation͒ software, and qualitative agreement of simulated and measured results was found. Factors influencing the accuracy of the temperature measurement are discussed.

show abstract

“…As shown in [25,26], epitaxial YBCO films consist of grains with low-angle grain boundaries between them. The boundaries are both a channel for exchange of oxygen atoms belonging to different CuO planes and a channel of oxygen ingress into the film and egress out the film, depending on the regime of post-growth annealing and storage atmosphere [11,26,27]. The spatial distribution of oxygen loss in the vicinity of a block boundary can be determined as follows.…”

Section: Monte-carlo Modelling and Flicker Noise Sources On The F −T mentioning

confidence: 99%

“…For perovskite substrates, LaAlO 3 (LAO) and NdGaO 3 (NGO), ξ = 1.0−2.0%; while for MgO the structural mismatch is essential, ξ ≈ 9%. The film structure was analysed using Raman spectroscopy [27,29,30]. Raman spectra were excited by an Ar laser and measured by a spectrometer based on a double monochromator.…”

Section: Film Growth and Diagnostics Of Ybco Filmsmentioning

confidence: 99%

Fabrication process and noise properties of antenna-coupled microbolometers based on superconducting YBCO films

Karmanenko

Семенов

Khrebtov

et al. 2000

Supercond. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

An analysis of how the detectivity and lifetime depend on the fabrication process of superconducting antenna-coupled microbolometers has been carried out. The temperature dependences of responsivity and noise equivalent power (NEP) have been estimated in terms of the thermal model. To reveal the main degradation mechanism, 1/f-noise characterization has been used. Monte-Carlo simulation of the annealing procedure of YBa 2 Cu 3 O 7 (YBCO) films for the operating ranges of frequency and temperature has shown that prevailing sources of flicker noise in superconducting microstrips are associated with transitions of oxygen atoms situated close to low-angle boundaries of the film blocks. The magnetron sputtering technique has been optimized to reduce the Hooge parameter for flicker noise to a record-breaking low value for YBCO films of about 10 −4 at 93 K. Comparative analysis of chemical, ion and laser etching techniques by low-temperature scanning electron microscopy and magneto-optics allowed the fabrication of microstrips with uniform current distribution characterized by critical current density higher than 10 6 A cm −2 at 77 K and long-time stability. The process of low-energy ion milling of YBCO films with an Ar + beam generated in a duopigatron ion source was used to reach a width resolution at the topology edge better than 0.2 µm. The antenna-coupled bolometers fabricated from the superconducting microstrips were used to register microwave radiation at a frequency of 70.3 GHz and temperature of 93 K. It is demonstrated that the developed technology makes possible the fabrication of long-lived YBCO-based antenna microbolometers with electrical NEP e = 1.5 × 10 −12 W Hz −1/2. The calculated response time of the antenna is about 30-150 ns. Further development is associated with fabrication of coupling microbolometers with immersed lens, with predicted optical detectivity D * = (4 × 10 9 −4 × 10 10) cm Hz 1/2 W −1 in the wavelength range 100-1000 µm.

show abstract

The formation of two-layered YBa₂Cu₃O_{7- delta}superconducting films and their microwave surface resistance

Cited by 21 publications

References 15 publications

Magneto-optical study of magnetic-flux penetration into a current-carrying high-temperature-superconductor strip

Magneto-optical study of magnetic-flux penetration into a current-carrying high-temperature-superconductor strip

Measurement and simulation of temperature dynamics under electron beam

Fabrication process and noise properties of antenna-coupled microbolometers based on superconducting YBCO films

Contact Info

Product

Resources

About