Extremely High Resolution Spectroscopy of Oxide Electronic

This grant led to considerable successes in our work on LAO/STO interfaces. Our efforts have led to two important discoveries, and there are clear paths to follow for subsequent research. Along with our collaborators, we have constructed LAO/STO structures that, for the first time, clearly exhibit depletion upon adjusting a top-gate voltage. Moreover, we discovered these structures can display a very large capacitance enhancement that appears to arise from “negative compressibility” of the electronic system. Using torque magnetometry, we discovered another surprising feature of the LAO/STO system. We found that the samples exhibited a strong super-paramagnetic signal, originating from the interface, that coexisted with superconductivity. The magnetism was about 0.3-0.4 Bohr Magnetons per unit sell – extremely strong, and it may be indicative of an unusual order parameter in the superconductor. Each of these results has lead to interesting questions (detailed below) that we would like to answer. Theorists have written papers in response to our work on magnetism of the LAO/STO interface, and there are competing models that we would like to test in future work. (a) Papers published in peer-reviewed journals (N/A for none) Enter List of papers submitted or published that acknowledge ARO support from the start of the project to the date of this printing. List the papers, including journal references, in the following categories: