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Topic: YBCO

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	ASC 2004: Technical Program (Site not responding. Last check: 2007-10-22)
		YBCO coated conductors have many advantages such as high critical current density even if they are exposed to large external magnetic field.
		In this work, AC loss characteristics of multifilamentary YBCO coated conductors with finite length which simulate the half of twist pitch of a twisted YBCO coated conductor are studied by FEM analysis.
		For analyzing multifilamentary YBCO coated conductors, the electric conductivity in the lateral direction is set to a constant value based on the measured resistance.
	www.ascinc.org /asc04/Format.asp?paperNumber=4ML07&Category=2 (198 words)

	OhioLINK ETD: Wen, Xuejun
		The initial YBCO morphology exhibits a column-like grain structure as a result of rapid a-growth when quenched from 1000 °C (the sample was pre-melted at 1030°C).
		During solidification, the YBCO grains will parallely nucleate on the surface of the silver alloy to minimize its surface energy, and grow along the a-axis rapidly resulting in a textured film.
		A thin “buffer” of 300 nm thickness was observed between the textured YBCO and the silver alloy substrate.
	www.ohiolink.edu /etd/view.cgi?ucin971281869 (622 words)

	ASC 2004: Technical Program (Site not responding. Last check: 2007-10-22)
		To achieve further improvements in performance in magnetic fields for coil-based applications at 50-65K, it is necessary to incorporate selective defects into the YBCO coating that pin the superconducting vortices.
		The YBCO coatings were prepared with dispersions of inorganic nanodots (nanoparticles) of varying size (5 to 100 nm) and/or with a range of rare earth (RE) substitutions.
		The characterization of the YBCO microstructure and the temperature-field performance of the 2G wires will be presented.
	www.ascinc.org /asc04/Format.asp?paperNumber=4MT06&Category=2 (216 words)

	Argonne-CMT Characterization of HTS Embodiments Using Molecular Spectroscopy (Site not responding. Last check: 2007-10-22)
		As a result of the inherent differences in the polarization tensors for the Raman active phonons of YBCO, when the excitation laser strikes the sample surface in a direction perpendicular to the YBCO c axis, the out-of-phase O2/O3 mode of YBCO at ca.
		The utility of Raman microscopy for probing the spatial variation of YBCO c-axis alignment is illustrated by the results of a mapping study (Fig.
		Since the O4 phonon is purely a c axis mode, its softening implies that (1) the c axis of the YBCO grains is in greater tension near NSPs than in domains of pure YBCO and, consequently, (2) the a-b planes of YBCO are experiencing greater compression near NSPs than in the pure YBCO domains.
	www.cmt.anl.gov /science-technology/basicsci/htsembodiments.shtml (770 words)

	Physics Today - Search and Discovery
		For operation at liquid nitrogen temperatures when a strong magnetic field is present, YBCO wires are preferable to BSCCO wires because of their better ability to pin magnetic flux.
		It's been known since the early days of YBCO that doping with calcium is one way of adding more hole charge carriers to the material.
		Because YBCO grows epitaxially on the substrate, this GB angle was maintained between the grains of the superconducting film.
	www.aip.org /pt/vol-53/iss-10/p21.html (1207 words)

	Structure of YBCO (Yttrium Barium Copper Oxide) (Site not responding. Last check: 2007-10-22)
		YBCO has what is called a Perovskite structure.
		Scientists are interested in YBCO because when it is cooled below around 90 Kelvin, which can be accomplished with liquid nitrogen, it becomes a superconductor.
		The two most important properties of YBCO are that it has no electrical resistance and that it expels a magnetic field.
	www.ch.ic.ac.uk /otway/YBCO.html (84 words)

	Planar Tunneling in YBCO, Physics Research Highlights, University of Illinois at Urbana-Champaign
		(YBCO) using multilayers of solution-deposited zirconia on the surface of the superconductor to form the insulating tunnel barrier.
		Multilayers of zirconia are deposited onto the YBCO surfaces by repeated reaction with tetra-n-propyl orthozirconate in hydrocarbon solution followed by reaction with water in n-propanol solution, yielding remarkably uniform tunneling barriers.
		Before deposition, the YBCO surface has a RMS roughness 0.19 nm, which is increased by 0.26 nm after 14 deposition cycles.
	www.physics.uiuc.edu /research/Highlights/PlanarTunneling.htm (381 words)

	\bigrmbf TEMPERATURE DEPENDENCE OF IN-PLANE RESISTIVITY OF YBCO: (Site not responding. Last check: 2007-10-22)
		We investigated the origin of variation in the magnitude and temperature dependence of the normal state resistivity frequently observed in different YBCO single crystals (or YBCO thin films) of the same Tc.
		The analysis of the experimental data obtained in the past on optimally doped untwinned and twinned YBCO single crystals (or YBCO thin films) revealed that the pure linear temperature dependence of resistivity is not the only dependence of resistivity on temperature that characterizes optimally doped YBCO.
		We discovered that the presence of residual interchain oxygen O(5) in the chain-layer of YBCO is responsible for the superlinear temperature dependence of resistivity.
	phyvax.ir.miami.edu:8001 /hts04/prog_abstracts/jung_jan_1.html (209 words)

	PLD of HTS Thin Films for Three Terminal Device Application
		Surface clustering of Au occurs at elevated temperatures and is attributed to increased surface mobility.
		Commercial YBCO targets are used (Target Materials and Jupiter Technology) and are preconditioned by periodic sanding with 220 grit SiC paper and a 5000 laser shot burn-in.
		YBCO is known to grow through a 3D island-growth (Volmer-Weber growth) mechanism resulting in thin films that are the result of the coalescence of these islands.
	home.att.net /~g.daly/Lase97/Lase97.htm (4256 words)

	OhioLINK ETD: Wen, Xuejun
		In this thesis, first two chapters give brief introduction to several aspects of superconductivity, including the concepts, history and applications of superconductivity, and fabrication techniques for long and uniform high-temperature superconductors tapes/wires.
		Although such an approach has proved successful in terms of achieving grain texturing and high transport current density, critical issues involving continuous processing of long-length conductors and stabilization of the superconductor have not yet been entirely settled.
		Such a film growth mechanism is fundamentally different from the epitaxial growth in the vapor deposition.
	rave.ohiolink.edu /etdc/view?acc_num=ucin971281869 (622 words)

	HIGH TEMPERATURE SUPERCONDUCTORS: III: YBCO Conductor Development
		A serious limitation to applications of YBCO superconductors is the presence of weak links in the form of grain boundaries.
		The high resistivity of YBCO grain boundaries is mainly attributed to the presence of solidified liquid phase and cracks at these boundaries.
		Using the liquid phase removal method, YBCO melt textured bars, over 10 cm in length and 0.5 cm2 in cross-section, are processed with "clean" grain boundaries free of secondary phases and cracks.
	www.tms.org /Meetings/Annual-97/Program/Sessions/TA315A.html (1692 words)

	SCI Engineered Materials - Products - Melt Textured YBCO Levitators(TM) (Site not responding. Last check: 2007-10-22)
		At SCI, the melt processed YBCO Levitators™ are generally fabricated using a top-seeded melt- texturing technique [14-17].
		The melt textured YBCO has also been used for development of transportation of Silicon wafers in a clean room atmosphere [24,31].
		Significantly, higher magnetic damping with flux drag in YBCO was observed compared to eddy current damping in copper.
	www.superconductivecomp.com /products/levitators (2125 words)

	YBCO Measurements (Site not responding. Last check: 2007-10-22)
		Unlike Copper, the YBCO pellet experiences a phase change on the quantum mechanical level at approximately 90 Kelvin.
		At this temperature the electrons begin to form pairs due to a weak attraction.
		The attraction is actually a result of the electrons' interaction with the crystal lattice of the YBCO atoms.
	www.physics.ubc.ca /~outreach/phys420/p420_96/bruce/ybco.html (392 words)

	Living State Physics - Franz Baudenbacher (Site not responding. Last check: 2007-10-22)
		Investigated the generation of defect structures in YBCO films, the relaxation of epitaxial strain and the generation of screw dislocations using AFM and STM techniques.
		Studied the origin and the temperature dependence of RHEED intensity oscillations during YBCO growth and measured the activation energy for surface diffusion.
		Bari,M.A., Baudenbacher,F., Santiso,J., Tarte,E.J., Evetts,J.E. & Blamire,M.G. C-axis tunneling in YBCO trilayer junctions with PBCO barrier.
	www.vanderbilt.edu /lsp/baudenbacher.htm (3190 words)

	Laser Patterning of YBCO Thin Films Protected by In-Situ Grown SrTiO3 Cap Layer (Site not responding. Last check: 2007-10-22)
		The patterning is achieved through both laser inhibition, in which an intense, focused laser beam locally melts YBCO transferring it into an insulating glass-like material, and laser writing, based on a laser-controlled diffusion of oxygen in or out of the YBCO film.
		We have found that oxygen easily migrates through the SrTiO3 layer, allowing to reversibly convert the underlying YBCO film between the superconducting and semiconducting (virtually insulating at low temperatures) phases.
		Aging studies, performed on an almost 2-years old laser-written YBCO film, showed a very good, both structural and electrical stability of our laser-processed structures.
	sensor.northgrum.com /es/stc/cryo/areas/abstract/slasc13.htm (225 words)

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