UConn Physics Colloquium
QUANTUM AND CLASSICAL EFFECTS IN MOLECULAR NANOMAGNETS
City College of New York
Molecular magnets, sometimes referred to as single molecule magnets, are organic crystals containing a very large (Avogadro's) number of magnetic molecules that are nominally identical, providing ideal laboratories for the study of nanoscale magnetic phenomena. With molecular clusters of large total spin (10 or higher), their behavior straddles the border between classical and quantum magnetism. The molecules are magnetically bistable at low temperatures, exhibit macroscopic quantum tunneling between up- and down-spin orientations, and demonstrate quantum interference between tunneling paths. Interest in these materials has grown dramatically in the last several years, owing to their potential use for high-density information storage, as well as the possibility that they could provide the qubits needed for quantum computation. Typical behavior of the class will be examined by considering Mn12-acetate, a particularly simple prototype. The talk will end with a brief description of our recent discovery of magnetic "deflagration", a phenomenon closely analogous to the propagation of a flame front through a flammable chemical substance.
Friday, February 9, 2007
Gant Science Complex
(We will meet for refreshments prior to the talk at 3:30 p.m., in the Gant Science Complex, Physics Library, Room P-103.)