脉冲激光外延生长YBa2Cu3O7–δ涂层导体LaMnO3缓冲层

采用脉冲激光沉积技术在双轴织构的Ni95W5(Ni-5W)合金基底上外延生长了LaMnO3(LMO)薄膜作为涂层导体缓冲层，研究了沉积温度对LMO薄膜生长织构和表面形貌的影响。研究结果表明：沉积温度对LMO薄膜的表面形貌有一定的影响；在沉积温度为650 ℃时，LMO薄膜具有良好的(00l)取向，薄膜表面平整均匀，光滑致密，其均方根粗糙度在2 nm以下；而且，在此LMO缓冲层上外延生长的YBa2Cu3O7–δ超导层具有良好的双轴织构，超导转变温度Tc为92 K，转变宽度小于1 K，临界电流密度Jc为5.3×105 A/cm2(77 K，自场)。

Epitaxial growth of LaMnO3 buffer layers for YBa2Cu3O7–δcoated conductors using pulsed laser deposition

LaMnO3 (LMO) thin films, as a single buffer layer of coated conductors, were epitaxially grown on the biaxially textured Ni95W5 (Ni-5W) alloy substrates by pulsed laser deposition (PLD). The effects of deposition temperature on the growth texture and surface morphology of the LMO films were investigated. The results show that: the deposition temperature has some effect on the surface morphology of the LMO films. At a deposition temperature of 650 ℃, the prepared LMO film possesses perfect (00l) orientation and shows a flat, smooth, dense and uniform surface with the root mean square (RMS) roughness below 2 nm; Moreover, the YBa2Cu3O7–δ superconducting layer epitaxially grown on this LMO film exhibits a good biaxial texture, a superconducting transition temperature (Tc) of 92 K with the transition width below 1 K, and a critical current density (Jc) of 5.3×105 A/cm2 at 77 K in self-fields.