Synthesis and characterization of KTO membranes using a sacrificial layer

The KTaO₃ (KTO) superconductivity with a transition temperature of 2.2 K have been discovered in interfaces formed by two-dimensional electron gases (2DEGs) [1]. Interestingly, the interface superconductivity isn’t observed in all 2DEGs through a series of research. Here, to further investigate its interface properties, we present results of crystal structures and electric properties in KTO/Sr₃Al₂O₆ (SAO)/KTO (111) using a water-dissolvable sacrificial layer with two different interfaces [2]. The SAO water-sacrificial films are grown by pulsed laser deposition from polycrystalline SAO target on KTO (111) followed by KTO films. We will first discuss the synthesis of the epitaxial SAO (111) layers on KTO (111) substrate and its evolution of time-dependent interfacial electric properties. Then we will report its interfacial performance between SAO and amorphous KTO. This work provides much structural and electrical insight into the SAO/KTO heterostructures to understand the similarities and differences with STO, and offers a possibility to explore recyclable electronics.