[22p-A302-1~12] 11.1 Fundamental properties

[22p-A302-1] Effects of protection layer on ultrathin FeSe/SrTiO₃ grown by the PLD technique

〇(D)Tomoki Kobayashi¹, Hiroki Ogawa¹, Hiroki Nakagawa¹, Fuyuki Nabeshima¹, Atsutaka Maeda¹ (1.Univ. of Tokyo)

Keywords:iron-based superconductor, thin film

The iron chalcogenide superconductor FeSe has attracted much attention for Tc enhancement up to 65 K in a monolayer film on SrTiO₃, which is attributed to interfacial effects between FeSe and STO. We have tried to realize high Tc superconductivity in ultrathin films of FeSe/STO using pulsed laser deposition (PLD), however, had not been successful because of degradation of the films by air exposure. In this work, we report the successful realization of high T_c superconductivity in ultrathin FeSe/STO using PLD, owing to deposition of protection layer and preventing degradation of films.