We report measurements of the magnetic susceptibility of single crystals of Mn12-acetate-MeOH, a newlysynthesized high-symmetry variant of the original single molecule magnet Mn12-acetate. A comparison of these data to theory and to data for the Mn12-acetate material shows that Mn12-acetate-MeOH is a realization of a transverse-field Ising ferromagnet in contrast to the original Mn12-acetate ma...

We study the eAects of a transverse magnetic field on the dynamics of the randomly diluted, dipolar coupled, Ising magnet LiHoo. ]()7Yog33F4. The transve'rse field mixes the eigenfunctions of the groundstate Ising doublet with the otherwise inaccessible excited-state levels. We observe a rapid decrease in the characteristic relaxation times, large changes in the spectral form of the relaxation,...

We develop a new theoretical framework for describing and analyzing exotic phases of strongly correlated electrons which support excitations with fractional quantum numbers. Starting with a class of microscopic models believed to capture much of the essential physics of the cuprate superconductors, we derive a new gauge theory—based upon a discrete Ising or Z2 symmetry—which interpolates natura...