Current distribution and critical state in superconducting silver-sheathed (Bi,Pb)-2223 tapes

Dip effect in ac susceptibility due to surface barrier with flux creep

“…All these are strong evidence that there exist SB's in Bi 2 Sr 2 CaCu 2 O 8 , which agrees well with the experimental findings as pointed above. 3,7,12,[19][20][21][22][23][24][25] Thus the experimental results of Bi2212 not only support our SB model but also show there is a different kind of DE originated from SB with flux creep.…”

“…4,6,11 For another example, a crossover on the magnetic relaxation rate curve dM /d ln(t) was predicted and observed as an effect of SB's. 14,18 Recently, the current density profiles of Bi-based HTSC crystals and silver-sheathed tapes have been measured with Hall sensors 7,12,[22][23][24][25] and the distributions of magnetic field have been visualized clearly by means of magnetooptical images. 3,[19][20][21] These experiments show that there exist surface zones with much higher j c than the inside.…”

Study on critical current distribution in CT-OP Bi-2223 tape based on the scanning Hall probe magnetic microscopy

“…This must be a reasonable assumption in case of flat tape and/or films. There are some techniques to solve the problem [5,6]. In this study, we employed a Fourier transform technique [6].…”

“…Scanning SQUID microscopy [3], magneto-optical imaging (MOI) [4] and the Hall probe magnetic microscopy [5] can be listed as the techniques to visualize local current flow. Among them, the Hall probe magnetic microscopy has an advantage that the Hall sensor can measure wide range of magnetic field intensity.…”

Selective detection of AC transport current distributions in GdBCO coated conductors using low temperature scanning Hall probe microscopy

“…[1] In our previous studies, we measured distributions of DC transport current in coated conductor with various external magnetic fields [2] and noticed that the DC current distribution was redistributed by external fields [3][4][5][6][7]. Likewise the DC current experiment, investigation about distribution of AC transport current and field dependence of AC current had been necessary.…”