After an introduction to the neutron
facility at NIST, I will discuss my
research in geometrically frustrated magnets. These systems exhibit
wide range of properties from spin liquid to unique magnetic ordered
from insulators to superconductors. To fully appreciate the properties
of these spin systems several neutron scattering techniques have
utilised and an overview of these techniques will be given.
Geometrical frustration is an important theme in
matter physics, as it allows the possibility of exotic ground states.
the context of magnetism this refers to the inability to form a
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
dynamical spins at low temperatures in the spin liquid, Tb_2 Ti_2
the local order in the spin ice, Ho_2 Ti_2 O_7 and the ordered state
Heisenberg spin pyrochlores.