Manipulating oxygen sublattice in ultrathin cuprates: A new direction to engineer oxides
作者: Debakanta SamalGertjan Koster
作者单位: 1* Inorganic Materials Science Group , MESA+ Institute for Nanotechnology , University of Twente , 7500 AE , Enschede , The Netherlands
刊名: Journal of Materials Research, 2015, Vol.30 (4), pp.463-476
来源数据库: Cambridge University Press Journal
DOI: 10.1557/jmr.2014.391
原始语种摘要: Atomic engineering of complex oxide thin films is now reaching a new paradigm: the possibility to control the cation coordination by oxygen anions. Here, we show two examples of stabilization of novel structural phases by manipulating the oxygen sublattices in complex Cu-based oxide thin films grown on SrTiO3: (i) epitaxial strain stabilization of a near cubic form of CuO and (ii) thickness-dependent structural transformation from bulk planar (polar) to chain-type (nonpolar) in SrCuO2 thin films that relieves the electrostatic instability. Experimental investigation on ultrathin CuO layer identifies the existence of an elongated ( c / a ∼ 1.34) rocksalt-type CuO phase, pointing to metastable 6-fold coordinated Cu with the hole occupied in the 3 d x...2− y 2 orbital. For ultrathin SrCuO2 layers, we demonstrate the possibility of moving oxygen ion from CuO2-plane to Sr-plane forming chain-type structure. X-ray absorption spectroscopy reveals preferential hole-occupation at the Cu-3 d 3 z 2− r 2 orbital for chain-type structure unlike to the planar case. Our findings testify unique stabilization processes through atomic rearrangement and provide new insight into the experimental realization of novel cuprate-hybrids to look for exciting electronic properties.
全文获取路径: Cambridge U Press  (合作)
影响因子:1.713 (2012)

  • ultrathin 超薄型的
  • oxygen 
  • engineer 技术员
  • sublattice 亚晶格
  • layer 
  • metastable 亚稳定的
  • thickness 厚度
  • plane 平面
  • elongated 引伸的
  • complex 超群