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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic and transport measurements of Tl-1223 superconductors (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 5287-5292 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic measurements have been performed on silver clad Tl-1223 and Tl-2223 tapes and a Tl-1223 single crystal to study the critical current properties of these samples. The Tl-1223 tape is shown by both magnetic and transport experiments to exhibit a highly granular nature, much more severe than that seen in the Tl-2223 tape, and in Bi-2223 tapes fabricated by similar rolling and pressing techniques. This characteristic is explained in terms of the poor grain alignment in the Tl-1223 tape resulting from the spherical morphology of Tl-1223 powders, in contrast with the micaceous and easily aligned Bi-2223 and Bi-2212 materials. However, evidence of a small number of strong intergrain links which remain superconducting at 77 K and 8 T is clear. The Tl-1223 single crystal exhibits clear anisotropic behavior, and this, together with the lack of good crystallographic alignment in the tapes is used to explain the variations in irreversibility line behavior between sample forms. The ratio of the irreversibility fields measured with field parallel and perpendicular to the ab plane is approximately 8. A clear "fish tail'' feature is also observed in magnetic hysteresis curves obtained from the Tl-1223 single crystal. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359282
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  • 2
    Electronic Resource
    Electronic Resource
    Further development of a novel pulling device for crystal growth (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 1585-1586 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have proposed a new method that could increase the pulling stroke length in a thermal expansion pulling device used for crystal growth. In this method, the thermal expansion part consists of more than one expansion rod linked by materials with low thermal expansion coefficients. We have constructed an experimental setup to demonstrate the advantage of the new design over the previous one. The measured data showed that the stroke length can be increased by 40% with two expansion rods. Also, a linear temperature dependence of the length was observed, and the reason for this observation was discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1333039
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  • 3
    Electronic Resource
    Electronic Resource
    High critical-current densities in (Tl0.5Pb0.5)Sr2Ca2Cu3O9 with Tc up to 115 K (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 1019-1021 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A high critical-current density was observed in the material (Tl0.5Pb0.5)Sr2Ca2Cu3O9. Based on magnetic-hysteresis measurements, this single (insulating) Tl-O layer material has a Jc value of 1.24×105 A/cm2 when measured at a temperature of 77 K and a field of 1 T. This value of Jc is comparable to that measured here for YBa2Cu3O7 (1.04×105 A/cm2), having single-conducting Cu-O chains, but considerably greater than the value for the material Tl2Ba2Ca2Cu3O10 with double (insulating) Tl-O layers in which no hysteresis was observed under these same conditions. Our results from specific heat measurements indicate that the (Tl0.5Pb0.5)Sr2Ca2Cu3O9 compound has a three-dimensional character due to the enhancement of the superconducting coupling along the c axis between the Cu-O planes and thus results in an increase in Jc compared to the two-dimensional Bi- and Tl-2212 and 2223 [e.g., (Bi or Tl)2(Sr or Ba)2CaCu2O8 and (Bi or Tl)2(Sr or Ba)2Ca2Cu3O10, respectively] compounds. We believe that the high Jc is associated with an increase in the irreversibility field, rather than an increase in pinning centers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106508
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  • 4
    Electronic Resource
    Electronic Resource
    Texturing and texture-induced intergranular critical state anisotropy of superconducting (Bi, Pb)2Sr2Ca2Cu3Ox ceramics (1994)
    Springer
    Journal of materials science 29 (1994), S. 3897-3905 
    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 Different techniques of texturing superconducting (Bi,Pb)2Sr2Ca2Cu3Ox ceramics, including magnetic alignment, cold-die pressing, unidirectional hot pressing and a combination of these techniques, have been systematically examined with respect to the final microstructures and superconducting properties of the ceramics. The intergranular critical state of the textured ceramics was found to be anisotropic, due to a high degree of grain alignment in these materials. All the intergranular critical states in these materials could be described by the Bean model, although the temperature dependence of the average intergranular pinning force densities were different. The microstructures of the samples were characterized using scanning electron microscopy and bulk density measurement. The critical states of the textured materials were studied using a.c. magnetic susceptometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00355947
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