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

Matvejeff, M.; Yoshimatsu, K.; Kumigashira, H.; Oshima, M.; Lippmaa, M.
October 2009
Applied Physics Letters;10/12/2009, Vol. 95 Issue 15, p152110
Academic Journal
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.


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