Tuning superconductivity of LaAlO₃/KTaO₃ (111) interface by uniaxial strain

Oxide heterostructure interface material based on KTaO₃ is a key area of research in condensed matter physics, especially of discovery of its superconductivity． Uniaxial strain technology has been widely applied in unconventional superconductors, to obtain important information on superconductivity and other related quantum order parameters by studying changes in physical properties after applying strain in different crystal orientations． The present work applies uniaxial strain technology to tune interface superconductivity of amorphous LaAlO₃/KTaO₃(111)． Critical transition temperature of superconductivity is found to increase with increased tensile strain and to decrease with increased compressive strain along the \langle 11\bar2 \rangle direction． The Curie-Weiss type divergence of elastoresistivity coefficient indicates anisotropic superconductivity at KTaO₃ interface． This is of great scientific significance to understand the physical essence of superconductivity in KTaO₃-based interface system．