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  • 1
    Electronic Resource
    Electronic Resource
    Growth and structural properties of epitaxial Pb(ZrxTi1−x)O3 films and Pb(ZrxTi1−x)O3-cuprate heterostructures (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4298-4305 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the epitaxial growth and structural properties of Pb(ZrxTi1−x)O3 (PZT) thin films and of epitaxial heterostructures containing metallic DyBa2Cu3O7 (DyBCO) and ferroelectric PZT layers grown using an off-axis rf reactive sputtering technique. On (100) and (110) SrTiO3 substrates, tetragonal (001) and (011) epitaxial Pb(Zr0.52Ti0.48)O3 films have been obtained. Extensive characterization on (001) PZT films using x-ray diffraction, scanning electron microscopy, transmission electron microscopy (TEM), Rutherford backscattering spectroscopy, and atomic force microscopy reveal a very high degree of structural quality, and very smooth surfaces with a root-mean-square roughness of 3 A(ring) for a 0.5 μm×0.5 μm scan on a 1000 A(ring) thick film. TEM studies on DyBCO–PZT structures reveal sharp and clean interfaces without traces of intermixing. Primary dislocations are observed at the DyBCO–PZT interface, which do not propagate through the PZT layer. [101]-type dislocations are also seen, possibly related to subgrains in the PZT layer, and they show an extended strain field throughout the PZT layer. The possible relation between these structural defects and the nonlinear current–voltage characteristics observed in DyBCO–PZT–Au structures is discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361798
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  • 2
    Electronic Resource
    Electronic Resource
    Enhancement of the critical current density in Chevrel phase superconducting wires (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 6277-6284 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The critical current densities Jc of Chevrel phase wires with niobium as an antidiffusion barrier were measured in magnetic fields up to 24 T. At 20 T and 1.9 K, Jc reaches 5.4×108 A/m2 and decreases slightly down to 3.1×108 A/m2 at 24 T. A wire with a 20% superconducting cross section has been successfully drawn and its overall critical current density Jcov exceeds 100 A/mm2 at 1.9 K up to a magnetic field slightly above 20 T. This demonstrates the ability of Chevrel phase wires to be used in high magnetic field applications. Moreover, some parts of the coil have certainly higher Jc, since Jc is very often limited by a thermal excursion of the entire coil. The effective upper critical field μ0Hc2*, deduced from the magnetic field dependence of Jc, is too low compared to the expected bulk value, indicating that superconducting properties at the grain boundaries are still degraded. If the bulk μ0Hc2 can be restored at the grain surfaces, Jcov should be higher than 100 A/mm2 up to at least 30 T. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364416
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  • 3
    Electronic Resource
    Electronic Resource
    Properties of superconducting Nd1+xBa2−xCu3O7−δ thin films deposited by dc magnetron sputtering (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 683-685 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the superconducting properties of Nd1+xBa2−xCu3O7−δ thin films deposited by dc magnetron sputtering from stoichiometric Nd1Ba2Cu3O7−δ and off-stoichiometric Nd1.12Ba1.88Cu3O7−δ targets. Highly epitaxial c-axis oriented samples with thicknesses ranging from 5 to 100 nm were obtained on SrTiO3(100) substrates from both targets. A suppression of screw-dislocation mediated growth for off-stoichiometric films is observed by STM, resulting in smooth surfaces with roughness of 2–3 nm on a 1 μm2 area. The effects of the deposition conditions on the structural and superconducting properties are investigated and discussed in relation to the Nd–Ba substitution in the Nd1+xBa2−xCu3O7−δ system. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121947
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear vibration and stability analyses on the basis of a kinetic stability theory for arbitrarily curved rods (1998)
    Springer
    Archive of applied mechanics 68 (1998), S. 46-63 
    Details
    ISSN: 1432-0681
    Keywords: Key words Kinetic stability ; nonlinear rod theory ; parametrically excited oscillation ; nonlinear vibration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary After formulating nonlinear kinetic stability equations for curved and twisted rods, these are used for the solution of static and kinetic lateral buckling problems as well as for linear and nonlinear stability analysis of parametrically excited vibrations of circular arches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190050145
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  • 5
    Electronic Resource
    Electronic Resource
    Homogeneity and critical current density of Sn-doped PbMo6S8 superconductors (1995)
    Springer
    Applied physics 61 (1995), S. 615-621 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 74.60.-w; 74.60.Mj; 74.70.-b; 74.70.Fi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  With the overall critical current density, J c, remaining low for PbMo6S8, the addition of 0.3 at.% Sn noticeably improved the performance. The enhancement occurs despite the presence of excess Pb and a slightly suppressed T c. The increase in J c can be attributed to a better homogeneity with respect to the chemical composition of the samples, which may be as a consequence of Sn substitution in the lattice. Detailed calorimetric investigation of undoped PbMo6S8 showed a T c distribution down to 9 K evidenced by a smearing of T c. This may be due to a progressive degradation of the sample quality leading to a plausible off-stoichiometry. High-resolution Auger electron spectroscopic experiments suggest a variation in composition indicating excellent correspondence with the specific heat data. However, no such deviation was detected for the Sn-doped samples and therefore the observed raise in J c. The results are discussed in conjunction with oxygen, lead and tin incorporated PbMo6S8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01542872
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  • 6
    Electronic Resource
    Electronic Resource
    Homogeneity and critical current density of Sn-doped PbMo6S8 superconductors (1995)
    Springer
    Applied physics 61 (1995), S. 615-621 
    Details
    ISSN: 1432-0630
    Keywords: 74.60.-w ; 74.60.Mj ; 74.70.-b ; 74.70.Fi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract With the overall critical current density,J c , remaining low for PbMo6S8, the addition of 0.3 at. % Sn noticcably improved the performance. The enhancement occurs despite the presence of excess Pb and a slightly suppressedT c . The increase inJ c can be attributed to a better homogeneity with respect to the chemical composition of the samples, which may be as a consequence of Sn substitution in the lattice. Detailed calorimetric investigation of undoped PbMo6S8 showed aT c distribution down to 9 K evidenced by a smearing ofT c . This may be due to a progressive degradation of the sample quality leading to a plausible off-stoichiometry. High-resolution Auger electron spectroscopic experiments suggest a variation in composition indicating excellent correspondence with the specific heat data. However, no such deviation was detected for the Sn-doped samples and therefore the observed raise inJ c . The results are discussed in conjunction with oxygen, lead and tin incorporated PbMo6S8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01542872
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  • 7
    Electronic Resource
    Electronic Resource
    Surface and bulk properties of hot-pressed PbMo6S8 superconductor studied by Auger electron spectroscopy and calorimetry (1995)
    Springer
    Applied physics 60 (1995), S. 459-465 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 74.60. ; w; 74.60.Mj; 74.70. ; b; 74.70.Fi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  A direct observation of the grain-boundary phases for several well-characterized hot-pressed PbMo6S8 samples were made by Auger electron spectroscopy. The surface elemental concentrations are completely different when compared to its bulk composition. The thickness of this altered composition is in the range 100–200 AÅ gradually increasing with increase in hot-pressing temperature. Also, evidence of segregation of impurities, such as carbon and SiO x , to the grain-boundaries were noticed for some of the samples. Calorimetric experiments show a continuous broadening and a reduction in amplitude of the specific heat anomaly at T C. This in terms of superconducting volume fraction indicates a T C distribution in the range 9–15 K. Such an observation can be related to the local inhomogeneities with respect to the ternary composition, i.e., a deviation from ideal stoichiometry, PbMo6S8. The results are discussed in conjunction with X-ray diffraction, scanning electron microscope, and energy dispersive X-ray analysis. By considering the grain-boundary phases and the calorimetric observation of inhomogeneities, a plausible explanation is given for the low critical current densities in these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538770
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  • 8
    Electronic Resource
    Electronic Resource
    Surface and bulk properties of hot-pressed PbMo6S8 superconductor studied by Auger electron spectroscopy and calorimetry (1995)
    Springer
    Applied physics 60 (1995), S. 459-465 
    Details
    ISSN: 1432-0630
    Keywords: 74.60.-w ; 74.60.Mj ; 74.70.-b ; 74.70.Fi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A direct observation of the grain-boundary phases for several well-characterized hot-pressed PbMo6S8 samples were made by Auger electron spectroscopy. The surface elemental concentrations are completely different when compared to its bulk composition. The thickness of this altered composition is in the range 100–200 Å gradually increasing with increase in hotpressing temperature. Also, evidence of segregation of impurities, such as carbon and SiOx, to the grain-boundaries were noticed for some of the samples. Calorimetric experiments show a continuous broadening and a reduction in amplitude of the specific heat anomaly atT c . This in terms of superconducting volume fraction indicates aT c distribution in the range 9–15 K. Such an observation can be related to the local inhomogeneities with respect to the ternary composition, i.e., a deviation from ideal stoichiometry, PbMo6S8. The results are discussed in conjunction with X-ray diffraction, scanning electron microscope, and energy dispersive X-ray analysis. By considering the grain-boundary phases and the calorimetric observation of inhomogeneities, a plausible explanation is given for the low critical current densities in these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538770
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1963)
    Springer
    Journal of molecular medicine 41 (1963), S. 930-935 
    Details
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01482730
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  • 10
    Electronic Resource
    Electronic Resource
    Epitaxial growth and properties of (CO3) stabilised BaCuO2 superconducting thin films (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 1325-1330 
    Details
    ISSN: 1573-7357
    Keywords: 74.72.Jt ; 74.76.−w ; 74.62.Bf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on the epitaxial growth of BaCuO2 infinite layer (stabilised with CO3 groups) thin films by rf magnetron sputtering on (100) SrTiO3 and (100) LaAlO3. Excellent (001) films with c∼4Å are obtained at 540 °C in a sputtering atmosphere of 1–10 mTorr of Ar+O2 with some addition of CO2. Off axis x-ray analysis reveal perfect in plane ordering and a tetragonal structure with a=b∼3.96 Å. For these deposition conditions the resistivity at room temperature is of the order of several Ωcm and exhibits a strong semiconductor-like behaviour. When the deposition temperature is increased to 660 °C, a supercell along the c axis appears with a period of about 8Å. After an in-situ annealing of these films in 7 Torr of oxygen at 500 °C, ϱ(300K) falls to 800μΩcm. The resistance versus temperature curve reveals then a metallic behaviour and a superconducting transitions with onsets between 10–40K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00753884
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