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  • 1
    Electronic Resource
    Electronic Resource
    Preparation of high Tc Tl-Ba-Ca-Cu-O thin films by pulsed laser evaporation and Tl2O3 vapor processing (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1810-1811 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tl-Ba-Ca-Cu-O superconducting thin films with zero-resistance temperatures up to 115 K have been prepared using a Tl2 O3 vapor process on Ba-Ca-Cu-O precursor thin films. The Ba-Ca-Cu-O thin films were made by laser deposition on Y-stabilized ZrO2 substrates. This technique minimizes problems caused by the toxicity of Tl2 O3, and its subsequent decomposition to the volatile and toxic Tl2 O upon heating. Therefore, it may have practical application in the fabrication of high Tc Tl-Ba-Ca-Cu-O superconducting thin-film devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101493
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  • 2
    Electronic Resource
    Electronic Resource
    Melt-processible rare earth-Ba-Cu-O superconductors based on molten Ba-Cu oxides (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1854-1856 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ba-Cu oxides with certain compositions were found to be meltable or partly meltable at a relatively low temperature of 950 °C. High-quality, dense, and void-free high-temperature superconductors based on rare earth(RE)-Ba-Cu oxides of the form REBa2Cu3O6.5+x have been made by reactions between molten Ba-Cu oxides and solid RE-containing materials at the same temperature. This has allowed superconductive components to be made in a wide variety of shapes. This melt process will significantly alter oxide superconductor preparation procedures, and will allow growth of large single crystals aiding in the understanding of the mechanism of superconductivity and in the search for superconductivity at even higher transition temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98492
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  • 3
    Electronic Resource
    Electronic Resource
    Flux pinning and motion of high-Jc Tl(2223) Ag-sheathed tapes (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 1658-1661 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dependence of resistance on temperature has been measured for a Tl-system 2223-phase Ag-sheathed tape with Jc(Jc=1.5×104 A/cm2, 77 K, 0 T) in an applied magnetic-field range from 0 to 0.8 T. The experimental results can be explained in terms of the thermally activated flux creep model. The relationship between pinning potential U0 and the applied magnetic field H oriented parallel to and perpendicular to the tape surface is, respectively, U0(parallel)=0.12H−0.22 eV and U0⊥=0.065H−0.35 eV. The relationship between pinning potential U and T follows: U(T,H)=U0(H)(1−t) (t=T/T0,T0=141 K). When H and the measuring current I are laid in the same tape surface, the broadened resistive transition is independent of the configuration between H and I, namely, an energy dissipation is independent of a macroscopic Lorentz force. The phenomenon is accounted for according to the two-dimensional pancakelike vortex-antivortex model based on the characteristic of a stronger intrinsic plane pinning of layer superconductors. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358923
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  • 4
    Electronic Resource
    Electronic Resource
    Superconducting TlSr2(Ca,Cr)Cu2O7 thin films with critical current density up to 106 A/cm2 (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 4259-4261 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting TlSr2(Ca,Cr)Cu2O7 thin films with zero resistance temperature Tc up to 102 K and critical current density Jc as high as 106 A/cm2 at 77.7 K have been successfully prepared via laser ablation and thallium diffusion. Prolonged low temperature annealing in air was used for film processing. X-ray diffraction patterns indicated that the films were highly oriented 1212 phase with c axes normal to the LaAlO3(100) or MgO(100) substrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354440
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  • 5
    Electronic Resource
    Electronic Resource
    Study on Zn-, Cd-, or Hg-addition into TlBaCuO (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 5289-5292 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nominal ZnTlBaCuO4.5, CdTlBaCuO4.5, and HgTlBaCuO4.5 samples have been prepared under different conditions and have been studied by resistance and ac-susceptibility measurements compared to nominal TlBaCuO3.5 samples. In general, the ZnTlBaCuO4.5 samples required less strict heating conditions to reach zero resistance near liquid nitrogen temperature; the CdTlBaCuO4.5 samples had lower Tc; the HgTlBaCuO4.5 samples showed slightly improved Tc at certain conditions. In contrast to La2−xSrxCuO4, Zn-addition did not significantly depress Tc of TlBaCuO. This observation is worthy to be investigated further. Hardness of the ZnTlBaCuO4.5 and CdTlBaCuO4.5 samples was greatly increased, which could have importance in the practical applications of these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347020
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  • 6
    Electronic Resource
    Electronic Resource
    Computer-controlled thermoelectric power measurement for bulk high Tc superconductors (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2263-2267 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have established a quick and easy, modified dc method to measure thermoelectric power for bulk high transition-temperature (Tc) superconductors. The temperature range investigated is from 300 to 50 K. The apparatus was developed on the basis of our already-existing commercial APD (APD CRYOGENICS INC, Allentown, Pennsylvania) superconductor characterization cryostat with a limited amount of extra instrumentation. The thermoelectric power is measured continuously within the temperature range by the control of a computer, a real time Seebeck coefficient S(T) versus temperature curve is plotted on the computer screen during the measurement, and the data can be saved to a disk. The entire processing period for each sample takes less than 2 h. This apparatus was calibrated with pure lead. By measuring on high Tc superconductors which are well known in thermoelectric power, the system has been shown to have high accuracy and reliability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143148
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  • 7
    Electronic Resource
    Electronic Resource
    Transport critical current and magnetization measurements of melt-processed YBa2Cu3O7−x (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5050-5055 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report magnetic field dependence of the transport critical current and dc magnetic susceptibility measurements on YBa2Cu3O7−x superconductors formed by melt-solid reactions at 950 °C between Ba-Cu-O (or Tb-Ba-Cu-O) and solid nonstoichiometric Y-Ba-Cu-oxide. Four-probe dc critical current measurements at 77, 64, and 4.2 K show strong depression of the critical current density with increasing magnetic field in agreement with a model of weakly linked superconducting regions. Diamagnetic shielding and Meissner flux expulsion measurements in the temperature range 10–300 K show about one third volume fraction of perfect superconductivity. Both shielding and flux expulsion were observed to be approximately temperature independent below 60 K indicating strong coupling between the grains throughout the entire volume below this temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342459
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  • 8
    Electronic Resource
    Electronic Resource
    Structural and elemental analysis of melt-processible high-temperature superconductors by surface science and x-ray diffraction measurements (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5056-5060 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the results of scanning electron microscopy (SEM), microprobe analysis (wavelength dispersive and energy dispersive spectroscopies), secondary-ion mass spectroscopy (SIMS), and x-ray diffraction measurements on a series of melt-processed high critical-temperature superconductors. The superconductors were synthesized through a melt reaction between TbBa2Cu3O7−x and nonstoichiometric rare-earth Ba-Cu-O oxides. The melt-processed samples are dense, largely void-free superconductors with critical temperatures in the 90–95 K range. Microprobe and SIMS data show the absence of Tb in surfaces of the interiors of samples which had been fractured to expose the interior regions. Comparative microprobe and SEM data are included for conventionally prepared sintered samples. Comparative x-ray diffraction studies are presented which show that the melt-processed samples studied have diffraction patterns nearly identical to those of sintered (rare earth)Ba2Cu3O7−x samples. In two of the three Y-based melt-processed superconductors studied, the compound stoichiometry from microprobe analysis is Y1Ba2Cu3O7−x. The evidence presented indicates that the TbBa2Cu3O7−x decomposes during the melt reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342460
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  • 9
    Electronic Resource
    Electronic Resource
    Levitation effects involving high Tc thallium based superconductors (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1119-1121 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thallium based superconductor Tl2Ca2Ba2Cu3O10+y has been shown to exhibit very stable and unusual levitation equilibria in various arrangements involving this material and permanent magnets. Attractive and repulsive forces are evident in experiments in which samples are levitated above and below magnets. Photographs of these experiments and approximate quantitative discussions of the results are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100660
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  • 10
    Electronic Resource
    Electronic Resource
    Tl2O3 vapor process of making Tl-Ba-Ca-Cu-O superconductors (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2686-2688 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new process for making Tl-Ba-Ca-Cu-O superconductors which is based on reactions between solid precursor Ba-Ca-Cu-oxides and vapor Tl2O3 has been developed. The Tl2O3 vapor process allows Tl-Ba-Ca-Cu-O superconductors to be easily made in the forms of complex bulk components, wires and fibers, and thick and thin films, and minimizes problems caused by toxicity and volatility of Tl starting compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100670
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