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[en] Flux pinning and weak link structure were studied on the effect of Ca doping in LnBa2Cu3O7-y systems (Ln = La and Y). The magnitude and the magnetic field dependence of the critical current density were improved by Ca doping. A small amount of impurity phase of such as Ca2Cu1O3 may work as a desirable flux pinning center. Moreover, it was found that the current-temperature characteristics for Ca-doped samples showed the evidence of two kinds of superconducting phases which have different transition temperature Tc and Tc'. The experimental result agrees well with the Ambegaokar--Baratoff theory for asymmetric Josephson junctions (S-I-S') in the temperature range of T < Tc' and with the proximity junction theory (S-N-S) in the range of Tc' < T < Tc
Source
Christen, D. (Oak Ridge National Lab., Oak Ridge, TN (United States)); Narayan, J. (North Carolina State Univ., Raleigh, NC (United States)); Schneemeyer, L. (AT and T Laboratories, Murray Hill, NJ (United States)); 1322 p; ISBN 1-55899-057-7; 
; 1990; p. 955-958; Materials Research Society; Pittsburgh, PA (United States); Materials Research Society fall meeting; Boston, MA (United States); 27 Nov - 2 Dec 1989; CONF-891119--; Materials Research Society, 9800 McKnight Rd., Suite 327, Pittsburgh, PA 15237 (USA)
; 1990; p. 955-958; Materials Research Society; Pittsburgh, PA (United States); Materials Research Society fall meeting; Boston, MA (United States); 27 Nov - 2 Dec 1989; CONF-891119--; Materials Research Society, 9800 McKnight Rd., Suite 327, Pittsburgh, PA 15237 (USA)