Investigation of Optimal Growth Conditions of La 0.7 Sr 0.3 MnO 3 –Bi 2 Sr 2 Ca 1 Cu 2 O 8 Heterostructures

The deposition conditions of less explored La 0.7 Sr 0.3 MnO 3 ( LSMO ) and Bi 2 Sr 2 Ca 1 Cu 2 O 8 ( Bi ‐2212) heterostructures are investigated in terms of two different deposition orders. One is in the order of Bi ‐2212/ LSMO and the other is LSMO / Bi ‐2212. The experimental results indicate the metal‐insulator transition ( T MI ) and Curie temperature ( T Curie ) of LSMO as well as the superconducting critical transition ( T C ) of the Bi ‐2212 to be very sensitive to the order of deposition. In Bi ‐2212/ LSMO , due to factors such as strain, roughness, and degree of oxygenation, superconductivity is not stabilized to interact with LSMO . Whereas the LSMO / Bi ‐2212 order of deposition displays both superconductivity and ferromagnetic behavior for a single post annealing condition. In LSMO / Bi ‐2212, depositing Bi ‐2212 as a top layer and post annealing in air is crucial to achieve optimal carrier concentration for exhibiting high T C .