Abstract
MgB2 superconducting wires were produced by the Mg diffusion method. Scanning electron microscopy (SEM), optical microscopy, dispersive X-ray analysis (EDS), and XRD diffraction were used to study the physical structure and content of the wires. Magnetic properties (T c m, H c1, H c2, J c by the Bean model) were obtained with a SQUID magnetometer, and transport properties (T c r, H c2, resistivity and residual resistivity ratio) were measured using a standard four-lead configuration. The V-I characteristics of the wires close to the critical temperature showed a staircase response, which was attributed to the presence of weak links, creating phase slip centers. The origin of those weak links is discussed in relation to their formation and structure.
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Bar-Sadan, M., Leitus, G. & Reich, S. Weak Links and Phase Slip Centers in Superconducting MgB2 Wires. Journal of Superconductivity 17, 497–502 (2004). https://doi.org/10.1023/B:JOSC.0000041786.14341.a1
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DOI: https://doi.org/10.1023/B:JOSC.0000041786.14341.a1