4.6 Article

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

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APPLIED PHYSICS LETTERS
卷 95, 期 15, 页码 -

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AMER INST PHYSICS
DOI: 10.1063/1.3243978

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  1. Academy of Finland [119599]
  2. NEDO [07E51002a]
  3. Academy of Finland (AKA) [119599, 119599] Funding Source: Academy of Finland (AKA)

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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]

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