Schedule Nov 20, 2007
Experimentally Motivated Problems in Some Highly Frustrated Rare-earth Magnetic Materials
Michel Gingras, University of Waterloo & KITP

There exist a fair number of insulating magnetic materials where the magnetic species is a 4f (rare-earth) element and which have been long known to display interesting and intriguing magnetic and thermodynamic behaviors. Examples include the three-dimensional Gd3Ga5O12 garnet (GGG) lattice of corner-sharing tetrahedra, the LiHo_xY_{1-x}F4 Ising material in a transverse magnetic field (TFIM), and a number of pyrochlore systems such as the Tb2Ti2O7 spin liquid, the spin Dy2Ti2O7 and Ho2Ti2O7 spin ices and the Gd2(Ti,Sn)2O7 long-range ordered systems. In this talk, I will review some of the problems motivated by experiments on these systems, discuss tentative explanations of what is maybe going on and emphasize what we do not understand.


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