High-T c superconductivity in theRBa2?xSrxCu3O7 system forR ? Y, Gd, Sm and Nd

Effect of Sr-for-Ba isovalent substitution on the local structure, hole distribution and magnetic irreversibility of Cu(Ba,Sr)2YbCu2O6.95(2)

“…Nevertheless, our recent works indicated that the H irr characteristics of the CuBa 2 RCu 2 O 6+z (Cu-1212) and Cu 2 Ba 2 RCu 2 O 7+z (Cu-2212) phases are rather depressed by the Sr substitution [20]. In fact, the first observation of the decrease in the critical current (J c ) characteristics in Cu-1212 with Sr substitution is from 1991 by Parent and Moreau [21]. Here we report the results of our systematic study on the Cu(Ba 1-y Sr y ) 2 YbCu 2 O 6.95 (2) (Cu-1212) system, to reveal that the depression in the H irr characteristics due to the Sr substitution most likely originates from the decrease in the concentration of mobile holes within the BB.…”

Effect of Sr-for-Ba isovalent substitution on the local structure, hole distribution and magnetic irreversibility of Cu(Ba,Sr)2YbCu2O6.95(2)

“…Quite importantly, for the Hg-based HTSCs replacing the larger Ba with the smaller Sr was proven to be an effective way to enhance the H irr values [9,[17][18][19] [20]. In fact, the first observation of the decrease in the critical current (J c ) characteristics in Cu-1212 with Sr substitution is from 1991 by Parent and Moreau [21]. Here we report the results of our systematic study on the Cu(Ba 1-y Sr y ) 2 YbCu 2 O 6.95 (2) (Cu-1212) system, to reveal that the depression in the H irr characteristics due to the Sr substitution most likely originates from the decrease in the concentration of mobile holes within the BB.…”