2 dimensional electron gas in chemically stable SrSnO$_3$/KTaO$_3$ interface

Recent 2DEGs are mostly formed at the interface of LaAlO$_{3}$/SrTiO$_{3}$(LAO/STO) system, which is explained by the polar catastrophe mechanism. Because of large propensity of oxygen vacancy formation in SrTiO$_{3}$, there remains a possibility that the origin of 2DEG of LAO/STO system may stem from extra charge of oxygen vacancy of SrTiO$_{3}$, not from the polar layer of LaAlO$_{3}$. In this presentation, we report the realization of 2DEG at the interface of SrSnO$_{3}$/KTaO$_{3}$(SSO/KTO), which is chemically stable due to extremely stable oxygen stoichiometry. This SrSnO$_{3}$/KTaO$_{3}$ heterosturcture was epitaxially grown by puled laser deposition and the interface was found atomically matched by transmission electron microscope and reciprocal space mapping. We measured the magnetic property of SSO/KTO heterostructure and acquired a large ferromagnetic signal, which is unchanged in the temperature range of 4$\sim$300 K by SQUID magnetometer measurement. As SrSnO$_{3}$ and KTaO$_{3}$ are non-magnetic materials, this ferromagnetic signal may result from 2DEG at the interface of SSO/KTO. We hope our results can shed lights on the exact mechanism of 2DEGs that are formed at oxide interfaces.