Chemical stability and transport properties of ultrathin La1.2Sr1.8Mn2O7 Ruddlesden-Popper films

Epitaxial La1.2Sr1.8Mn2O7 films with n=2 Ruddlesden-Popper structure were grown on SrTiO3 (001) substrates. Decomposition through water intercalation led to the disappearance of the metal-insulator transition in samples exposed to ambient atmosphere. Crystal damage was limited to the surface layer only, demonstrating the anisotropic nature of the water intercalation process. By protecting films with a SrTiO3 capping layer, the metal-insulator transition persisted down to 2.5 unit cell thick films. In thinner films, we propose a mechanism related to the loss of interlayer ferromagnetic order in favor of in-plane antiferromagnetism as a reason for the loss of the metallic state. (C) 2009 American Institute of Physics. [doi:10.1063/1.3243978]