Interfacial charge transfer and magnetism in 5$d$-3$d$ oxide heterostructures

The existence of strong spin-orbit coupling has brought the iridates to the forefront of materials research, whereas strong electronic correlation has proven to produce a plethora of novel properties within the manganites. Here, we investigate the physical properties of interfaces between such materials by synthesizing a series of artificial superlattices with 5$d$ paramagnetic metal SrIrO$_{\mathrm{3}}$ and 3$d$ antiferromagnetic insulators AMnO$_{\mathrm{3}}$, where A $=$ Sr or La. Through our investigations by x-ray diffraction, magnetometry, dc-transport, x-ray circular dichroism, and polarized neutron reflectometry measurements, we observe both novel magnetic and transport properties, which drastically differ from those of the constituent materials and are highly sensitive to the degree of dimensional confinement within the superlattices. Here we will present these results and discuss the implications of these intriguing magnetic and electronic properties. This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.