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superconductor-characterization
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Measurement of Critical Current Density in Bulk Superconductors Based on Small Point Contact Characterization
, Article Journal of Superconductivity and Novel Magnetism ; 2013 , Pages 1-4 ; 15571939 (ISSN) ; Zabetian, A ; Kananian, S ; Fardmanesh, M ; Sharif University of Technology
2013
Abstract
A new approach to measure the critical current density of bulk superconductors is presented in this paper. In the proposed technique, the characterization uses a pulsed current which passes through a small point contact at the middle of the bulk and distributes uniformly, while the other contact is a copper ring around the bulk. By increasing the pulsed current above a threshold current, a normal zone appears and develops into a semi-oblate spheroid forming around the contact point. By analyzing its size and shape, and electromagnetic fundamentals, the voltage-current relationship in the normal zone is obtainable. In addition, experimental works have been performed and the results are in...
Synthesis and characterization of YBaCu2O5-δ compound
, Article Physica C: Superconductivity and its Applications ; Volume 548 , 15 May , 2018 , Pages 112-115 ; 09214534 (ISSN) ; Sandoghchi, M ; Mokhtari, P ; Akhavan, M ; Sharif University of Technology
Elsevier B.V
2018
Abstract
YBaCu2O5 compound as one of the possible microstructures of Y3Ba5Cu8O19 has been synthesized. The X-ray diffraction analysis of this compound indicates that its formation is accompanied with the formation of YBa2Cu3O7-δ. The observed superconductivity around ∼92 K supports this. So, it seems that YBa2Cu3O7-δ is responsible for the observed superconductivity in YBaCu2O5, and this phase is not an independent superconducting phase. Consequently, the overall effect of the YBaCu2O5 formation during the Y3Ba5Cu8O19 fabrication process could be a reduction in Tc. © 2018 Elsevier B.V