抄録
Oxide superlattices provide an effective platform to manipulate the space-inversion and/or time-reversal symmetries, where emergent phases and orders could be created. Here, we artificially design Sr2IrO4/SrTiO3 superlattices with various periodicities. The valence states and magnetism were investigated by hard x-ray absorption spectroscopy (XAS) and magnetic circular dichroism (XMCD) at the Ir L edge, respectively. Compared with the pure Sr2IrO4 thin film, the peak position of the Ir-L3 edge XAS shifts to higher energy in the superlattices, indicating possible charge transfer effect at the interface. In addition, the magnetic transition temperature in superlattices is decreased, which may be attributed to the interfacial coupling between Ti and Ir atoms.
