Carbon incorporated YBa2Cu3O7−d crystal; growth, phase separation and enhancement of irreversibility field

Abstract Carbon incorporated YBa 2 Cu 3 O 7−d (YBCO) crystalline films have been grown from a high temperature solution of BaOCuO containing barium carbonate. Superconducting properties of YBCO crystal containing carbon have been measured. Transition temperature significantly decreases from about 90K both in transport and magnetic measurements when the carbon content exceeds 0.06wt%. Hysteresis loop has a peak at 1–2T for the sample with the carbon concentration of 0.045wt%. The irreversibility field increases as the carbon concentration decrease.