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  • 1
    Electronic Resource
    Electronic Resource
    Low-temperature magnetic and electromagnetic studies of Y-Ba-Cu-O: Agx Ceramic superconductor (1991)
    Springer
    Journal of superconductivity 4 (1991), S. 485-488 
    Details
    ISSN: 1572-9605
    Keywords: Magnetic hysteresis ; remanent magnetization ; flux creep ; pinning potentials ; weak links
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Magnetization and magnetic relaxation measurements have been studied at 4.2 K on YBa2Cu3O7−δ:Ag x (x=0 to 1.2) superconducting samples prepared by a coprecipritation technique. Remanent magnetization and hysteresis loops were found to be increased on Ag addition. Transport current density (J c) was enhanced with the addition of Ag concentration. Flux creep rate was also increased with increase in Ag addition resulting in stronger pinning potential. Microwave-induced d.c. voltage measurements show a reduction of weak links with increase in Ag concentration. The enhancement of transportT c is attributed to the stronger Josephson current paths due to the reduction of the total number of weak links after Ag addition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635869
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  • 2
    Electronic Resource
    Electronic Resource
    Studies on magnetization and microwave properties of gamma-ray-irradiated Sm-Ba-Cu-O superconductors (1993)
    Springer
    Journal of superconductivity 6 (1993), S. 81-85 
    Details
    ISSN: 1572-9605
    Keywords: Gamma-ray irradiation ; transport and magnetic critical current density ; weak links
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Studies on the effect of gamma-ray irradiation on critical transition temperature, transport and magnetic critical current density (at 4.2 K), high-field magnetization (at 4.2 K), and microwave-induced d.c. voltage (inverse a.c. Josephson effect) have been performed on SmBa2Cu3O7−δ ceramic superconducting samples prepared by the coprecipitation technique. Gamma-ray irradiation of the samples was carried out using a60Co source of 103 Ci strength for several hundreds of hours; the dose received by the samples was 80 K rad/h.γ-Ray irradiation was found to have no effect on its structural modification and on the critical transition temperature. However, transport and magnetic critical current density are increased. Irradiation also caused a significant increase in the high-field magnetic hysteresis, which is presumably connected with the creation of radiation-induced mobile defects. An appreciable decrease in the microwave-induced d.c. voltage at 77 K was also observed after irradiation, which suggests that the mobile defects are clustered at the major defect region and thus reduce the total number of weak links. Enhancement of transport and magnetic critical current density may be due to the stronger pinning of flux lines at theγ-ray-induced defect site in SBCO ceramic superconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617805
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic and transport critical current density of laser-irradiated Sm-Ba-Cu-O superconductor at 4.2 K (1993)
    Springer
    Journal of superconductivity 6 (1993), S. 93-98 
    Details
    ISSN: 1572-9605
    Keywords: Magnetic and transport critical current density ; laser irradiation ; pinning center ; weak lins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The low temperature (4.2 K) magnetic and transport critical current density of laser-irradiated (Q-switched ruby laser, 694 nm, 30 ns) Sm-Ba-Cu-O ceramic superconductors prepared by the coprecipitation technique have been investigated. Laser irradiation did not significantly change the structural parameter and the critical transition temperatureT c but caused an appreciable increase in magnetic critical current densityJ mc and transport critical current densityJ tc . Inverse a.c. Josephson effect studies at 77 K showed a sharp decrease of microwave-induced d.c. voltage after laser irradiation. SEM studies revealed partial melting at grain boundaries and grain growth due to sintering which improves the interconnectivity in the network of superconducting grain structures after laser irradiation. These phenomenon are attributed to physical densification and consequent reduction in the total number of weak links between the superconducting grains. The significant increase ofJ mc andJ tc after laser irradiation is presumably connected with the creation of irradiation-induced mobile defects which act as pinning centers and, hence, stronger Josephson current paths between the superconducting intergrains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617807
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  • 4
    Electronic Resource
    Electronic Resource
    Low-temperature magnetic and microwave studies of Gd0.95Ba2Cu3.05O7−δ: Agx composites (1993)
    Springer
    Journal of superconductivity 6 (1993), S. 285-290 
    Details
    ISSN: 1572-9605
    Keywords: Magnetic hysteresis ; flux creepweak links ; pinning force
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Gd0.95Ba2Cu3.05O7−δ: Agx (x=0.0, 0.02, 0.04, 0.06) ceramic superconducting samples were prepared by a co-precipation technique using organic carbonates in the presence of stable polymers. The room-temperature normal-state resistivity decreases with Ag addition. However,T cand crystallographic parameters were uneffected. Low-temperature (4.2 K) magnetic and electrical transport studies in high magnetic fields (5 T) reveal that the addition of Ag into the Gd0.95Ba2Cu3.05O7−δ (GBCO) enhances the magnetic critical current density (J mc), volume pinning force (F p), flux explusion, and transport critical current density (J tc). Microwave-induced dc voltage studies show the reduction in the total number of weak links between superconducting GBCO grains with increase in Ag concentration. The flux creep rate was also increased with increase in Ag concentration in GBCO resulting in stronger pinning potential. The increase inJ mc, Jtc, and, hence,F pwith Ag addition in the GBCO suggests the creation of an SNS-type proximity junction at the intergrannular region and stronger Josephson current paths between the superconducting intergrains, which may be due to the physical densification and reduction of the total number of weak links by Ag addition into the GBCO superconducting system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626271
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic and microwave properties of Sm1−xBa2Cu3+xO7−δ superconductors at 4.2 K prepared by an organic carbonate coprecipitation route (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 245-250 
    Details
    ISSN: 1572-9605
    Keywords: Magnetic hysteresis ; pinning potentials ; critical current density ; flux creep ; weak links
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Samples of Sm1Ba2Cu3O7−δ and Sm0.95Ba2Cu3.05O7−δ are prepared by a coprecipitation technique using organic carbonates in the presence of stable polymers. The electrical, magnetic, and microwave measurements have been carried out to characterize the materials. Both normal (Sm1Ba2Cu3O7−δ ) and copper-rich (Sm0.95Ba2Cu3.05O7−δ ) samples showed sharp superconducting transitions at 94 K. Lower and upper critical fields of the samples are estimated from magnetization measurements. The critical magnetization current density (J mc ) and pinning force density (F p ) of the samples are obtained from the magnetization hysteresis loop at 4.2 K for fields up to 5T. Superconducting parameters (H c (O),K GL,λ,ξ) are obtained by using the values of lower and upper critical magnetic fields. Microwave-induced d.c. voltage measurements indicated a smaller number of weak links for copper-rich samples. The enhancement of critical current density and the reduction of total number of weak links for copper-rich samples may be due to the increase in hole concentration caused by the partial replacement of Sm by Cu.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617624
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  • 6
    Electronic Resource
    Electronic Resource
    High-field magnetic and transport critical current density of Sm-Ba-Cu-O: Agx superconductors at low temperature (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 471-475 
    Details
    ISSN: 1572-9605
    Keywords: Magnetic critical current density ; transport critical current density ; weak links ; pinning force
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Variation of magnetic critical current density (J mc) and transport critical current density (J tc) in high magnetic fields at liquid helium temperature were investigated on Sm-Ba-Cu-O: Ag x (x=0.0, 0.2, 0.4, and 0.6) superconducting samples prepared by the coprecipitation technique.T c and crystallographic parameters remain unaffected by Ag addition. However, bothJ mc andJ tc were found to increase on Ag addition. The volume pinning force (F p) also increased with increase in Ag concentration, resulting in stronger flux line sheer. Microwave-induced d.c. voltage measurement shows a significant reduction of the total number of weak links between the superconducting grains with increasing concentration of Ag, which creates stronger pinning potentials between the boundary of the superconducting intergrains. Hence, the volume pinning force is greatly enhanced by Ag addition, leading to flux line lattice movement which is responsible for highJ mc andJ tc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620506
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  • 7
    Electronic Resource
    Electronic Resource
    Low-field behavior of critical current in Sm1−x −Ba2−Cu3+x −O7−δ ceramic superconductor (1993)
    Springer
    Journal of superconductivity 6 (1993), S. 87-91 
    Details
    ISSN: 1572-9605
    Keywords: Transport critical current ; weak links ; magnetic hysteresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The transport critical currentI c carried by ceramic Sm1−x Ba2−Cu3+x −O7−δ (SBCO) superconducting samples (prepared by the coprecipitation technique using organic carbonate in the presence of stable polymer) in low magnetic fields (0–100 Oe) have been investigated at different temperatures close to the critical transition temperatureT c . A significant reduction of the transport current-carrying capacity has been observed for magnetic fields smaller than the lower critical fieldH cl . A semilog plot of the field dependence of the transport critical current densityJ ct reveals a well-defined field valueH′ c characteristic of a crossover between regions dominated by the inter- and intragranular effects. Microwave measurements show evidence of a reduction in the total number of weak links between the network of the superconducting grain structure for Cu-rich SBCO samples. The enhancement ofJ tc for Cu-rich SBCO samples is due to the increase in hole concentration caused by partial replacement of Sm by Cu which caused physical densification between the network of superconducting grain structure in SBCO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617806
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  • 8
    Electronic Resource
    Electronic Resource
    Low-field behavior of magnetic and transport properties of laser irradiated Nd-Ba-Cu-O ceramic superconductors (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 841-847 
    Details
    ISSN: 1572-9605
    Keywords: Flux pinning ; weak links ; laser-induced defects ; transport critical current density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The low-field behavior of magnetic and transport properties of high-power laser-irradiated (Q-switched ruby laser, 694 nm, 30 ns) Nd-Ba-Cu-O (NBCO) ceramic superconductors prepared by the coprecipitation technique have been investigated. Laser-irradiated NBCO samples contribute significantly to the flux pinning for low applied magnetic fields. A well-defined field valueH′ c was observed for different laser-irradiated samples which is characteristic of a cross-over between regions dominated by the inter- and intragranular effects. The value ofH′ c for a laser-irradiated sample is increased with increasing number of laser pulses. Thermal modeling of laser heating reveals that on irradiation the surface melts up to a depth of 1μm and laser-induced evaporation occurs at energy density 2.5 J/cm2. SEM studies showed grain growth due to laser-induced surface sintering which improves the interconnectivity among the superconducting grain structure and thus attributed to physical densification and consequent reduction in the total number of weak links. The increase of flux trapping and transport critical current density after laser irradiation is determined by the rigidity of the flux line lattice which may be due to the presence of additional pinning centers caused by the creation of laser-induced mobile defects and their clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320880
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  • 9
    Electronic Resource
    Electronic Resource
    Dielectric properties and optical absorption of X-ray irradiated KD2PO4 (1990)
    Springer
    Journal of materials science 25 (1990), S. 3573-3576 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effects of X-ray irradiation on the dielectric constant (K) and loss (tan δ) in the frequency range 102 to 3 × 105 Hz, temperature range 30 to 105 ° C, and on optical absorption, have been studied. All these parameters are found to be decreased considerably with increasing doses of X-ray irradiation. The effects of irradiation on these parameters for KD2PO4 crystals are found to be greater than those of KH2PO4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00575391
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  • 10
    Electronic Resource
    Electronic Resource
    Spectral characteristics of luminescence exhibited by X-ray or γ-ray irradiated alkali halide single crystals subsequently excited with laser light (1992)
    Springer
    Journal of materials science 11 (1992), S. 106-107 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724613
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