Hetero-Epitaxial Growth of CeO₂ Films on MgO Substrates

Abstract

High quality hetero-epitaxial CeO 2 films are grown on MgO substrates using BaSnO 3 buffer layers. CeO 2 films and BaSnO 3 buffer layers are grown by a pulsed laser deposition method. It is found that the crystallinity of the CeO 2 films directly grown on MgO substrates is quite poor. However when we grow CeO 2 films on MgO substrates with a BaSnO 3 buffer layer, the crystallinity of CeO 2 films is improved from that of the directly grown CeO 2 films. Also the estimated in-plane crystallinity () of the CeO 2 films on the BaSnO 3 buffer layers is much improved by the introduction of the buffer layers. One of the reasons for high quality CeO 2 films are grown on MgO substrates by the introduction of BaSnO 3 buffer layers is the lattice matching between the CeO 2 films and the MgO substrates. The CeO 2 films grow in a 45 rotated mode to the BaSnO 3 buffered MgO substrates, then the lattice mismatch between the sublattice of the CeO 2 films and the MgO substrates is calculated to be 9.3%, while that of the CeO 2 films on MgO substrates in a cube on cube mode is over 25%.

Structure and band gap tuning of transparent (Ba 1−x Sr x )SnO 3 thin films epitaxially grown on MgO substrates

“…a wide band gap of 3.4 eV and a lattice constant a = 4.1163 Å [15,16]. They were also usually used as insulating buffer layers in the preparation of heterostructures, such as high-critical temperature superconductor YBa 2 Cu 3 O 7 and insulator CeO 2 , due to the commensurate lattice [17,18]. However, the solid solutions of stannate Sr-doped BaSnO 3 (BSSO) with the tunable crystal lattice and band structure over a relatively wide range through changing the Sr/(Ba,Sr) ratio were rarely studied.…”

Critical Current Density Enhancement around a Matching Field in ErBa2Cu3O7-δ Films with BaZrO3 Nano-Rods

“…We have been independently growing high crystalline quality ErBa 2 Cu 3 O 7À (ErBCO) thin films and ErBCO thin films with BaZrO 3 nano-rods which showed low surface resisntance. 9,10) In this paper, we report field angular dependencies of ErBa 2 Cu 3 O 7À films with BaZrO 3 nano-rods with respects to the matching field calculated from the density of BaZrO 3 nano-rods. Large critical current density enhancement is observed at around a magnetic field which coincides with the calculated matching field.…”

“…The obtained ErBa 2 Cu 3 O 7À films with BaZrO 3 nano-rods have c-axis preferred orientation with a T C around 89 K and good crystalline quality as evaluated by a rocking curve. 10) Figure 1 shows a typical cross sectional TEM image of the ErBa 2 Cu 3 O 7À films with BaZrO 3 nano-rods. The image is taken from the a=b-axis.…”

Preparation of (100)-oriented CeO2 film on (100) MgO single crystal substrate by laser chemical vapor deposition using solid precursor

“…In the present study, the cube-on-cube epitaxial growth mode of CeO 2 [001]//MgO [001] was obtained due to the high interfacial energy caused by high R dep (16-24 mm h À 1 ). Cube-on-cube epitaxial growth mode of CeO 2 film on (100) MgO substrate also has been obtained by other groups [17][18][19]. Fig.…”