Combined experimental and DFT theoretical results on low-dimensional new Ni+/Ni2+ (d9/d8) homologous series, Lnn+1NinO2n+2 with n =2 and 3 layered oxides with Ruddlesden-Popper (RP)-related structures and isostructural and isoelectronic with the high temperature superconducting cuprates are presented. Temperature variation of magnetization, transport, specific heat and 139La NMR data in La4Ni3O8 evidence the presence of a transition near ~105 K. DFT calculations suggest similarity of the band structure with that of the cuprate superconductors and relate the transition at 105 K to a spin density wave nesting instability of the Fermi surface. Another RP phase, PbMn3Mn4O12 prepared at high pressure and high temperature, undergoes a structural phase transition at ~380 K from the room temperature rhombohedral to a high temperature cubic phase. Temperature dependence of magnetic susceptibility, electronic transport and dielectric constant show a transition at ~68 K, which suggest coupling of a ferroelectric-like and magnetic behavior that is potentially multiferroic

Multifunctional materials: Synthesis, structure and properties relationships

243rd National Meeting (2012)

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