Interests: Electronic and magnetic properties of crystalline solids, especially strongly correlated materials such as the cuprate high-temperature superconductors.
Techniques: Magnetic Resonance, ß-detected NMR and NQR, muon spin rotation, conventional solid-state NMR.
Research: Synthesis of thin solid films (typically transition metal oxides) and heterostructures via Pulsed Laser Deposition and other means. Analysis of local magnetic properties in thin films and near interfaces with ßNMR. Synthesis of nanostructured solids, such as arrays of noble metal nanoparticles.
In ßNMR, one detects the nuclear magnetic resonance of a ß-radioactive nucleus via the decay products, megavolt energy electrons. Such a signal is easy to detect, and, combined with the high nuclear polarization obtained by optical pumping prior to implantation, this yields an enormously higher signal per spin than conventional NMR. In fact, one typically uses a few million nuclei for a measurement, instead of 1020 in a typical NMR experiment. One can thus make some kinds of measurements which are inconceivable with conventional NMR such as the NMR in thin films a few to tens of nanometers thick. On this length scale, there are many interesting phenomena which can be measured with such a probe. In ßNQR, one uses the splitting of the nuclear spin states by the interaction of the nuclear spin with the local value of the electric field gradient in a crystal for example. One can then use this as a sensitive local probe of the charge distribution in the vicinity.
I have an ongoing program in ßNMR. I also have a program on the synthesis and characterization of thin films of oxides and other materials at AMPEL using pulsed laser deposition, spectroscopic ellipsometry and many other techniques.