Investigation of Optimal Growth Conditions of La0.7 Sr0.3 MnO3 -Bi2 Sr2 Ca1 Cu2 O8 Heterostructures

Abstract

The deposition conditions of less explored La0.7Sr0.3MnO3 (LSMO) and Bi2Sr2Ca1Cu2O8 (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 (TMI) and Curie temperature (TCurie) of LSMO as well as the superconducting critical transition (TC) 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 TC.