Event
MSE Seminar-Dr. Jason S. Gardner, NIST
Friday, February 15, 2008
1:00 p.m.
Rm. 2108, Chemical and Nuclear Engineering Bldg.
Annette Mateus
301 405 5207
amateus@umd.edu
"Neutron Scattering and Slow Spin Systems"
After an introduction to the NIST facility and the ongoing expansion project, I will discuss my research in geometrically frustrated magnets. These systems exhibit a wide range of properties from spin liquid to unique magnetic ordered and from insulators to superconductors. To fully appreciate the properties of these spin systems several neutron scattering techniques have been utilised and an overview of these techniques will be given.
Geometrical frustration is an important theme in current condensed matter physics, as it allows the possibility of exotic ground states. In the context of magnetism this refers to the inability to form a ground state with long range order at sufficiently low temperature. I will review several neutron scattering studies on these compounds, focusing on the study of spin dynamics in pyrochlore oxides. Evidence for large, dynamical spins at low temperatures in several antiferromagnets and a crossover from classical to quantum regime in the spin ices will be discussed.
For more information, contact Annette Mateus at (301) 405-5207 or amateus@umd.edu.
