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0422674_MacLaughlin

0422674_MacLaughlin

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0422674_MacLaughlin

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  1. Muon Spins and Frustrated Magnetism in NiGa2S4Douglas. E. MacLaughlin, University of California-Riverside, DMR 0422674 Our research uses the muon spin relaxation technique: a local mag-netic probe to study exotic mate-rials. Much like NMR, but implanted muons are the resonant spins. We are studying the low-spin (S=1) 2D frustrated antiferro-magnet NiGa2S4. Frustration = competing magnet-ic interactions; spins cannot satis-fy all their neighbors! What happens then? A funda-mental problem in magnetism. Results: an unconventional low-temperature phase transition, quantum fluctuations, unusual effects of applied magnetic field.

  2. Muon Spins and Frustrated Magnetism in NiGa2S4Douglas. E. MacLaughlin, University of California-Riverside, DMR 0422674 Muon spin rotation is carried out with small collaborations (~10 participants) at meson factories with high-intensity beams of muons, such as TRIUMF (Vancouver, Canada) and the Paul Sherrer Institute (Switzerland). Students and postdocs acquire experi-ence at international facilities, learning a variety of experimental techniques. Our group also carries out NMR experiments on the UC Riverside cam-pus. Shown are (left to right) UCR graduate student Mark Rose, DEM, visiting graduate student Anika Bosse from T.U. Braunschweig, Germany, and UCR graduate student Lei Shu. Our mix of experimental techniques prepares students for a wide range of future careers in academia, industry, or government.