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PREPARATION AND CHARACTERISATION OF YTTRIUM BARIUM COPPER OXIDE (YBa2Cu3O7-δ) SUPERCONDUCTOR
Munmun Dhal. The high temperature superconducting sample YBCO is prepared by the solid state reaction method. This analysis reveals the contribution of grain and grain boundary roles in YBCO. On 8th April , Dutch physicist Heike Kamerlingh Onnes found that the resistivity of mercury suddenly dissapeared around 4. This abrupt disappearance of electrical resistance below a particular temperature, arises due to the phenomenon of superconductivity.
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Chemical solution deposition for YBCO superconducting films and Sm2O3 buffer layers on single crystal and biaxially textured metallic substrates. Lin Wang , University of Wollongong Follow. Chemical solution deposition CSD is of great research interest as it is a low-cost, highly flexible route for the fabrication of high-quality thin films. Fabrication of large-area YBCO films for microwave application by the TFA-MOD method was investigated, including the influence of processing parameters such as gas flow rate and crystallization duration. With optimized processing conditions, high quality large-area YBCO films can be obtained, and the microwave surface resistance is comparable to values for commercial films prepared by the vacuum technique.
In this thesis, the pseudogap and the precursor superconducting state, which are of great importance in clarifying the superconductivity mechanism in high-temperature cuprate superconductors, are investigated with a c-axis optical study in YBa2 Cu1-xZnx 3Oy. Testing was performed over a wide energy range with smaller temperature intervals for several Zn-substituted samples, as well as for several carrier-doping levels. A spectral weight SW analysis, in which the pseudogap behavior can be separated from the superconducting condensate with the SW transfer to the high-energy region, revealed that the pseudogap is not the precursor of the superconductivity carriers moving to the high-energy region with pseudogap opening never contribute to the superconducting condensation. Moreover, the high-energy transfer continues even below Tc for the Zn-substituted samples in which we weaken the superconductivity , which gives evidence to the coexistence of the pseudogap and the superconducting gap below Tc.
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