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The Cooper group uses optical spectroscopy to reveal the properties of and excitations in novel states of matter in strongly correlated materials. His group has developed particular expertise in light-scattering experiments on materials under extreme conditions of low temperature, high pressure, and high magnetic field. The Cooper group's Raman spectroscopy experiments have shed light on the behavior of matter through various pressure- and magnetic-field-tuned quantum (T~0 K) phase transitions.
The Cooper group's first accomplishment with its "extreme conditions" optical spectroscopy capability was a study of the evolution of the crystal lattice ("phonon") and atomic spin dynamics through the pressure-tuned destruction of the insulating state of layered ruthenate materials. More recently, his group has studied how high pressures "melt" charge- and orbital-ordered insulating states, even at T=0 K, creating novel metallic phases. His group has also shown that magnetic fields can be used both to control the elastic properties of materials (e.g., "magnetic field induced shape memory") and to thwart long-range order down to T=0 K.
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Alexander Thaler, Alexander Zakjevski,Brian Nguyen, Y Gim, Anne Farwick,A A Aczel,S Lance Cooper,G J Macdougall
Bulletin of the American Physical Society (2015)
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Bulletin of the American Physical Society (2015)
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