Title :
Critical current density, irreversibility line, and flux creep activation energy in silver-sheathed Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ superconducting tapes
Author :
Shi, D. ; Wang, Z. ; Sengupta, S. ; Smith, M. ; Goodrich, L.F. ; Dou, S.X. ; Liu, H.K. ; Guo, Y.C.
Author_Institution :
Argonne Nat. Lab., IL, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
Experimental transport data, magnetic hysteresis, and flux creep activation energy results are presented for silver-sheathed high-T/sub c/ Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ superconducting tapes. The 110 K superconducting phase was formed by lead doping in a Bi-Sr-Ca-Cu-O system. The transport critical current density was measured at 4.0 K to be 0.7*10/sup 5/ A/cm/sup 2/ (the corresponding critical current is 74 A) at zero field and 1.6*10/sup 4/ A/cm/sup 2/ at 12 T for H// ab. Excellent grain alignment in the a-b plane was achieved by a short-melting method, which considerably improved the critical current density and irreversibility line. Flux creep activation energy as a function of current is obtained based on the magnetic relaxation measurements.<>
Keywords :
bismuth compounds; calcium compounds; creep; critical current density (superconductivity); high-temperature superconductors; magnetic hysteresis; magnetic relaxation; melting; silver; strontium compounds; 110 K; 12 T; 4.0 K; Ag-Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/; HTSC; a-b plane; critical current density; flux creep activation energy; grain alignment; magnetic hysteresis; magnetic relaxation measurements; short-melting method; superconducting tapes; transport data; Bismuth; Creep; Critical current density; Current measurement; Density measurement; Doping; Magnetic field measurement; Magnetic hysteresis; Strontium; Superconducting films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
