Structural and transport properties of biaxially aligned YBa2Cu3O7−x films on polycrystalline Ni-based alloy with ion-beam-modified buffer layers

Abstract

Biaxially aligned YBa2Cu3O7−x (YBCO) thin films were produced on polycrystalline Ni-based alloy, by using biaxial yttria-stabilized-zirconia (YSZ) intermediate layers formed by off-normal ion-beam-assisted deposition. Most explicit in-plane alignment was obtained when the YSZ layer formed with the beam-incident angle of 55° from substrate normal. Jc-B characteristics and angular dependence of Jc on the magnetic field were measured. 5.0×105 and 5.5×104 A/cm2 were obtained at 77 K with 0 and 8 T, respectively. The distribution of misorientation angles of in-plane a and b axes between YBCO grains was evaluated by both x-ray pole figure measurement and planar observations of transmission electron microscopy. 50% of the grains had the misorientation angles restricted within ±5°. From the image of dislocations, the elastic strains at grain boundaries were estimated to be relaxed with lower misorientation angle. The high-Jc properties are understood to be obtained by the current paths through low-angle grain boundaries.

Enhanced critical-current in P-doped BaFe2As2 thin films on metal substrates arising from poorly aligned grain boundaries

“…For coated conductors using YBa 2 Cu 3 O 7− δ 6 and other rare-earth-based cuprates (REBCO), two types of techniques are used to achieve highly in-plane oriented practical metal-tape substrates. One technique is to deposit a biaxially textured buffer-layer on a non-oriented metal-tape by the ion beam assisted deposition (IBAD) method78. The other is to use a highly oriented Ni–W alloy metal-tape substrate fabricated by the rolling-assisted biaxially textured substrate (RABiTS) method910.…”

YBaCuO and REBaCuO HTS for Applications

“… ion‐beam‐assisted deposition (IBAD), e.g. of YSZ 17 ( yttria‐stabilized zirconia ), GZO (Zr 2 Gd 2 O 7 ), 18,19 both with CeO 2 over layers, 20 and of MgO; or inclined substrate deposition (ISD) mainly of MgO see, for example, in Prusseit et al 21,22 …”

“…ion‐beam‐assisted deposition (IBAD), e.g. of YSZ 17 ( yttria‐stabilized zirconia ), GZO (Zr 2 Gd 2 O 7 ), 18,19 both with CeO 2 over layers, 20 and of MgO; or…”

Robust critical current density in applied magnetic fields in 5 μm thick, SmBa2Cu3O7− based superconducting wires

“…Within the IBAD research community, there have been many different cubic metal and metal oxide materials that have been demonstrated to be biaxially textured to some degree. Two of these that were initially used as templates are yttrium-stabilized zirconia (YSZ) and gadolinium zirconate (GZO) [1,2]. More recently, a third template, magnesia (MgO) has been in use more frequently.…”

“…Issues arising from ''weak-link'' intergrain current transport have led to the development of different methods for their fabrication. The ion beam assisted deposition (IBAD) [1][2][3] method is one of the methods being used to create substrate on which highly textured HTS with low angle grain boundaries can conduct large intergrain currents. This method involves the deposition of cubic metal oxide films to form substrates for the CC.…”