Chemical stability and transport properties of ultrathin La_(1.2)Sr_(1.8)Mn_2O_7 Ruddlesden-Popper films

摘要

Epitaxial La_(1.2)Sr_(1.8)Mn_2O_7 films with n = 2 Ruddlesden-Popper structure were grown on SrTiO_3 (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 SrTiO_3 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.