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  • 1
    Electronic Resource
    Electronic Resource
    Ultraviolet light assisted oxygenation process for submicron YBa2Cu3O7−δ thin film devices (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 5411-5418 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have successfully fabricated superconducting nanobridges and grain-boundary junctions from epitaxial YBa2Cu3O7−δ thin films with thickness between 20 and 30 nm and width down to ∼100 nm. The patterning process turned out to severely deteriorate the transport properties resulting in structural damage, corrosion, and oxygen loss. The most crucial steps are the baking procedure used to cure the electron beam resist, the resist development, and the ion beam etching process. By optimizing these steps and applying a suitable post-treatment procedure a significant enhancement of the sample quality could be achieved. An ultraviolet light assisted oxygenation procedure after the patterning process enabled us to achieve superconducting transition temperatures between 80 and 87 K and critical current densities at 4.2 K up to 4×107 A cm−2 for the nanobridges and 5×103–2×105 A cm−2 for the grain boundary junctions. At 4.2 K junctions with width down to 100 nm corresponding to a junction area down to 2.3×10−3 μm2 showed superconductivity. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1459599
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  • 2
    Electronic Resource
    Electronic Resource
    Normal-incidence grating spectrograph with large acceptance for inverse photoemission (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1212-1214 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A spectrometer for inverse photoemission in the vacuum ultraviolet range is described. A spherical grating with an acceptance of f/4 is used in normal incidence. Two position-sensitive detectors allow the registration of spectra covering the whole range of photon energies from 8 to 28 eV in parallel. The optical resolution is 18 A(ring) for the Lyman-α line of hydrogen. A space-charge-limited electron gun with an energy spread of 0.25 eV is used to excite inverse photoemission spectra. The large acceptance angle of the grating allows one to measure spectra with high efficiency and low background level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1137977
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  • 3
    Electronic Resource
    Electronic Resource
    Comparison of Josephson vortex flow transistors with different gate line configurations (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 1095-1097 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We performed numerical simulations and experiments on Josephson vortex flow transistors based on parallel arrays of YBa2Cu3O7–δ grain boundary junctions with a cross gate line allowing us to operate the same devices in two different modes named the Josephson fluxon transistor (JFT) and Josephson fluxon–antifluxon transistor (JFAT). The simulations yield a general expression for the current gain versus number of junctions and normalized loop inductance and predict higher current gain for the JFAT. The experiments are in good agreement with simulations and show improved coupling between gate line and junctions for the JFAT as compared to the JFT. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1346625
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  • 4
    Electronic Resource
    Electronic Resource
    Spin-dependent transport in the double-perovskite Sr2CrWO6 (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 3654-3656 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the preparation and characterization of the double-perovskite compound Sr2CrWO6 with a Curie temperature of 390 K. We have fabricated both Sr2CrWO6 bulk sintered polycrystalline bars and high-quality epitaxial thin films on SrTiO3 substrates by pulsed-laser deposition. The samples were characterized by thermogravimetric analysis, x-ray diffraction, electrical transport, and magnetization measurements. Polycrystalline samples containing a large number of grain boundaries show a large low-field magnetoresistance of up to 100% at 5 K. At room temperature, this effect is reduced to a few percent. Our results show that Sr2CrWO6 is an interesting candidate for room-temperature magnetoelectronic materials. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1421227
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  • 5
    Electronic Resource
    Electronic Resource
    Antigenicity and immunogenicity of the polyagglutinable antigen of Pseudomonas aeruginosa (1988)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 47 (1988), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Pseudomonas aeruginosa strains isolated from cystic fibrosis patients agglutinate in antisera against anti-polyagglutinable antigen (PA). Anti-PA antibodies were formed in rabbits when immunization was carried out with bacteria possessing core-bound PA, independently of whether the strains were of S or R phenotype. For bacterial agglutination with anti-PA antibodies two prerequisites are essential: the bacterial cell must be of R phenotype and must possess the core-linked PA. In contrast, the PA in the isolated LPS's can be demonstrated in passive haemagglutination for both (S or R) phenotypes, provided the PA is core-linked. Two PA forms have been recognized, one found only in P. aeruginosa species, both in free and bound form. The other one is shared by all members of Pseudomonas genus but is present only in a free, unbound form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1988.tb02498.x
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  • 6
    Electronic Resource
    Electronic Resource
    Structural relationship between the polyagglutinable antigen and the core polysaccharide of Pseudomonas aeruginosa (1988)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 47 (1988), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract It has been observed that each strain of the Pseudomonas aeruginosa species harbours the so-called polyagglutinable antigen (PA). Some strains may produce it in a form which is linked to the core moiety of lipopolysaccharide (LPS) and this type of PA can thus be detected by passive haemagglutination using the isolated LPS as coating antigen. Other strains synthesize PA exclusively in a free form, which is also coextractable with LPS, its presence can, however, be demonstrated by the haemagglutination inhibition test. From a polyagglutinable strain of P. aeruginosa an R-type LPS was isolated having the core-linked PA. This LPS preparation was highly immunogenic with regard to its PA moiety. The core-bound PA seems to exert an immunosuppression on the core region, hence, the polyagglutinable strains isolated from cystic fibrosis patients only engender anti-PA antibodies, whereas antibodies against both, side chain and core region of LPS, are not engendered. The mucoid exopolysacharides also contains the PA which could possibly play an important role in the patient by protecting P. aeruginosa cells against anti-PA antibodies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1988.tb02497.x
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  • 7
    Electronic Resource
    Electronic Resource
    Elastic properties of the premelting phases of the perfluoroalkanes C16F34 and C20F42 (1989)
    Springer
    The European physical journal 75 (1989), S. 101-107 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The elastic properties of the solid state of linear oligomers are closely related to their special intra-and inter-molecular interactions. This is proved for the perfluoroalkanes C16F34 and C20F42. The elastic tensors of both materials have been measured with Brillouin spectroscopy as a function of temperature. Both systmes show an extremely weak shear stiffnessc 44, indicating the existence of a smectic-B like structure and an unexpected strong elastic anisotropy inversion in the premelting phase. Moreover a Curie-Weiss-law behavior was found for the stiffness constantc 33 indicating the existence of a soft longitudinal acoustic phonon mode. The transition temperatureT c is for C20F42 below the melting point. The elastic properties are purely static. The observations are tentatively attributed to an intermolecular premelting process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313572
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  • 8
    Electronic Resource
    Electronic Resource
    Brillouin spectroscopy on monodomains of thin polycrystalline layers of molecular crystals (1988)
    Springer
    Applied physics 47 (1988), S. 367-371 
    Details
    ISSN: 1432-0630
    Keywords: 78.35.+c ; 62.20.Dc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An unconventional Brillouin-spectroscopic technique is proposed to determine elastic stiffness tensor coefficients of molecular crystals. With 90A Brillouin measurements on thin monodomains of melt-crystallized films (about 30 μm thickness) the need to grow large single crystals is avoided. Measurements on sym-difluorotetrachloroethane and perfluoroeicosane are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615500
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  • 9
    Electronic Resource
    Electronic Resource
    Brillouin spectroscopy on monodomains of thin polycrystalline layers of molecular crystals (1988)
    Springer
    Applied physics 47 (1988), S. 367-371 
    Details
    ISSN: 1432-0630
    Keywords: 78.35.+c ; 62.20.Dc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An unconventional Brillouin-spectroscopic technique is proposed to determine elastic stiffness tensor coefficients of molecular crystals. With 90A Brillouin measurements on thin monodomains of melt-crystallized films (about 30 μm thickness) the need to grow large single crystals is avoided. Measurements on sym-difluorotetrachloroethane and perfluoroeicosane are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615500
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetoconductance Fluctuations and Re-entrance Effect in Normal-metal/Superconductor Nanostructures (2000)
    Springer
    Journal of low temperature physics 118 (2000), S. 679-687 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The proximity of a superconductor strongly influences theelectronic properties of a normal metal. We report onmeasurements of the re-entrant behavior of the conductance ofmesoscopic gold/niobium heterostructures. At very lowtemperature a novel peak shows up in the conductance vs.voltage characteristics which can be suppressed by smallmagnetic fields of several mT. Furthermore, the proximityeffect gives rise to unique electronic interferencecontributions resulting in an increase of the rms of theconductance fluctuations by a factor of 2 $$\sqrt 2 $$ in ourheterostructures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004647529550
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