Title :
Magneto-optical imaging of transport currents in YBa2Cu 3O7-x on RABiTSTM
Author :
Feldmann, D. Matthew ; Reeves, Jodi L. ; Polyanskii, Anatollii A. ; Goyal, Amit ; Feenstra, Ron ; Lee, D.F. ; Paranthaman, M. ; Kroeger, D.M. ; Christen, D.K. ; Babcock, Sue E. ; Larbalestier, David C.
Author_Institution :
Appl. Supercond. Center, Wisconsin Univ., Madison, WI, USA
fDate :
3/1/2001 12:00:00 AM
Abstract :
Two YBa2Cu3O7-x (YBCO) on RABiTS TM conductors with high Jc (0 T, 77 K) values of 2.3 and 2.4 MA/cm2 were scribed by laser cutting to constrict supercurrent flow. On one of these tracks, magneto-optical (MO) imaging of the self-field produced by a transport current directly demonstrates the percolative nature of the current flow. Using backscattered electron Kikuchi pattern (BEKP) analysis, we have found that Ni grain boundaries (GBs)>5° generally introduce GBs in the YBCO that have lower J c values than the intra-grain
Keywords :
barium compounds; composite superconductors; critical current density (superconductivity); electron backscattering; electron diffraction; grain boundaries; high-temperature superconductors; laser materials processing; magneto-optical effects; superconducting thin films; yttrium compounds; HTSC; Ni grain boundaries; RABiTS conductors; YBa2Cu3O7-x; YBa2Cu3O7; backscattered electron Kikuchi pattern; critical current density; current flow; laser cutting; magneto-optical imaging; self-field; supercurrent flow; transport current; transport currents; Conductors; Critical current density; Grain boundaries; Image analysis; Laser beam cutting; Magnetic analysis; Magnetic fields; Magnetization; Optical imaging; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
