[23p-D215-1~16] 11.1 Fundamental properties

[23p-D215-8] Annealing effects and the electronic states of the infinite-layer (Ca_0.85Sr_0.15)_1-xLa_xCuO₂ cuprate thin films

〇Riku Kagawa¹, Sang Eun Park¹, Hirotaka Okabe², Jumpei Nakamura², Hideki Kuwahara¹, Ryosuke Kadono², Tadashi Adachi¹ (1.Sophia Univ., 2.KEK-IMSS)

Keywords:Infinite-layer cuprate, Pulsed laser deposition, Undoped superconductivity

To understand the electronic states of the infinite-layer cuprates, we prepared thin films of infinite-layer (Ca_0.85Sr_0.15)_1-xLa_xCuO₂ on the LSAT substrate by the pulsed laser deposition (PLD) technique and investigated annealing effects on the electronic states. It was found that there was almost no excess oxygen but in-plane oxygen defects in as-grown x = 0. For x = 0.10, on the other hand, the electrical resistivity decreased by two orders of magnitude through the reduction annealing. This suggests that the excess oxygen in the La-substituted as-grown films is probably removed by the reduction annealing.