(111)⇒(001) orientational phase transitions and nature of the insulating state in BiSrCaCuO (2212 and 2223) films

The influence of the growth temperature T s on the structure, optical absorption, and electrical conductivity of BiSrCaCuO films has been studied. It was observed that nonmonotonic changes in the parameters of the films with T s are caused by (111)⇒(001) phase transitions at T s ≈550 °C for the 2212 phase and T s ≈600 °C for the 2223 phase. These phase transitions stimulate the formation of metallic conductivity and are caused by a change in the system of preferential ordering planes of the atoms.

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