Preparation of one to three unit cell thick powders and investigation of their magnetic and microwave properties

Blinov, E. V.; Fleisher, V.G.; Huhtinen, H.; Laiho, R.; Lähderanta, E.; Paturi, P.; Stepanov, Yu. P.; Vlasenko, L. S.

doi:10.1088/0953-2048/10/11/005

Cited by 34 publications

(23 citation statements)

References 36 publications

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“…These basic fragments are approximately of the same size as the smallest particles in the powder used for preparation of the n target. 19 In addition, a few larger particles with h up to 4 nm and D up to 80 nm are found on the substrate, as can be observed from the difference between the distribution of the mode ͑position of the maximum in the distribution͒ and the mean ͑the mathematical average͒ values of the particle size in Table IV. The size distribution depends strongly on the values of E, P 0 , and d. 20…”

Section: A As-deposited Particlesmentioning

confidence: 67%

“…7͑b͔͒, giving h/DϽ0.1 as in the precursor nanopowder. 19 During annealing at 400°C the average h is tripled to Ϸ3 nm, retaining this value at T a ϭ500, 600, and 700°C. At the same time the average D increases to 30 nm.…”

Section: B Influence Of Post-annealingmentioning

confidence: 93%

“…This should influence the microscopic structure of the plume and that of the film formed on the substrate. Using a target prepared from YBaCuO nanopowder 19 we have been able to deposit thin superconducting films having the transition temperature T c ϭ90 K and the critical current density J c ϭ8ϫ10 6 A/cm 2 at 77 K in zero magnetic field. 20,21 In comparative measurements on films prepared by PLD from a commercial m target the value of J c ϭ2ϫ10 6 A/cm 2 was achieved.…”

Section: Introductionmentioning

confidence: 99%

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Laser deposition from a nanostructured YBaCuO target: Analysis of the plume and growth kinetics of particles on SrTiO3

Huhtinen

Järvinen

Laiho

et al. 2001

Journal of Applied Physics

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The plume generated by a pulsed XeCl laser from a novel nanostructured YBaCuO target (n target) is investigated by methods of optical emission spectroscopy and atomic force microscopy. While the spectral positions of the emission lines are the same, stronger line intensities, pertinent to higher kinetic energy of the particles, are observed in the plumes generated from the n target than from a target having micron size grains (m target). The size of small clusters captured on Si plates assembled inside the plume grows in directions perpendicular to the axis of the plume. As shown by x-ray photoelectron spectroscopy investigations, in the particles deposited on a SrTiO3 substrate at Ts=700 °C in oxygen the correct 1-2-3 composition is achieved. The average ratio of the heights of the particles deposited from the n target and from the m target is hn/hm=0.6, both in the plume and on SrTiO3. This can explain the smoothness of YBaCuO films prepared by laser deposition from the n targets.

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Section: A As-deposited Particlesmentioning

confidence: 67%

Section: B Influence Of Post-annealingmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Laser deposition from a nanostructured YBaCuO target: Analysis of the plume and growth kinetics of particles on SrTiO3

Huhtinen

Järvinen

Laiho

et al. 2001

Journal of Applied Physics

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“…In this meaning the intergrain and intragrain properties of these samples can be distinguished and even separated by experimental methods [29][30][31]. On the other hand, the high frequency and microwave measurements can be applied to study the particle size effects in crushed, powdered and fine powder based specimens [32][33][34][35].…”

Section: Measurements and Resultsmentioning

confidence: 99%

Particle size effect of a.c. superconducting properties in compound

et al. 1999

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Using a new starting material of Ba2Cu3O5 and a three step heat treatment, single phase Tl2Ca1Ba2Cu2O8 high-Tc superconducting samples have been prepared, possessing the onset-and critical temperatures To = 114 K and Tc = 105 K. The morphology dependent value of Hc1 is 17 Oe, 8 Oe and 5 Oe at 77 K in the case of bulk, crushed and powdered materials, respectively. The a.c. susceptibility, r.f. susceptibility and microwave absorption properties show a significant dependence on the particle size with a sharp change in the interval between 750 µm and 1200 µm. These experiments provide characteristic parameters for intergrain material (treated as 3D Josephson network) as λJ = 0.8 mm, HJc = 0.28 Oe and JJc = 2.2 A/cm 2 at 77 K. The data are controlled by modulated microwave absorption measurements. The results obtained can be explained well both by the finite size junction model and cavity mode absorption model. The Josephson network is determined unambiguously by metallic S-N-S weak links.PACS. 74.25.-q General properties; correlations between physical properties in normal and superconducting states -74.40.+k Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) -75.40.-s Critical-point effects, specific heats, short-range order

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“…Different kinds of sol-gel processes are described in the literature [19][20][21][22][23][24]. Usually, organic salts, e.g.…”

Section: Sol-gelmentioning

confidence: 99%

Investigation of DyBa₂Cu₃O_7−d superconducting domains grown by the infiltration technique starting with small size Dy-211 particles

Mathieu

Koutzarova

Rulmont

et al. 2004

Supercond. Sci. Technol.

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An infiltration and growth process is here used as an alternative to the classical top-seeded melt-textured growth process for the production of Dy-123 single-domains with finely dispersed small size Dy-211 particles. The starting materials are the 211-particles and a barium and copper rich liquid phase precursor. The infiltration and growth process allows for controlling both the spatial and size distribution of the 211-particles in the final superconducting 123-single-domain. The main parameters (set-ups, maximum processing temperature with respect to the peritectic temperature, nature of reactant, porosity of the 211 -preform) of the infiltration and growth process are discussed. Moreover, different processes of chimie douce are shown in order to produce Dy-211 particles with controlled shape and size, particles that can be used as precursors for the infiltration and growth process.

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Preparation of one to three unit cell thick powders and investigation of their magnetic and microwave properties

Cited by 34 publications

References 36 publications

Laser deposition from a nanostructured YBaCuO target: Analysis of the plume and growth kinetics of particles on SrTiO3

Laser deposition from a nanostructured YBaCuO target: Analysis of the plume and growth kinetics of particles on SrTiO3

Particle size effect of a.c. superconducting properties in compound

Investigation of DyBa₂Cu₃O_7−d superconducting domains grown by the infiltration technique starting with small size Dy-211 particles

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Preparation of one to three unit cell thick powders and investigation of their magnetic and microwave properties

Cited by 34 publications

References 36 publications

Laser deposition from a nanostructured YBaCuO target: Analysis of the plume and growth kinetics of particles on SrTiO3

Laser deposition from a nanostructured YBaCuO target: Analysis of the plume and growth kinetics of particles on SrTiO3

Particle size effect of a.c. superconducting properties in compound

Investigation of DyBa2Cu3O7−d superconducting domains grown by the infiltration technique starting with small size Dy-211 particles

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Product

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Investigation of DyBa₂Cu₃O_7−d superconducting domains grown by the infiltration technique starting with small size Dy-211 particles