Physics Colloquium: Time-of-flight neutron scattering and 2D spin correlations in 3D crystals

Event Details

  • Speaker(s): Bruce Gaulin
  • Date:
  • Time: 4:00 PM
  • Location: MacN 101

Brockhouse Institute for Materials Research and Department of Physics
McMaster University

Abstract

New instrumentation for neutron science is being built on an unprecedented scale, particularly with the advent of the Spallation Neutron Source, where I spent much of the last two years.  The new instrumentation utilizes the time-structure of the scattering and position sensitive area detectors and possesses figures-of-merit between 1-2 orders of magnitude higher than that obtainable only a few years ago.  As I'll describe, these new techniques are very well suited to study exotic magnets which fail to develop long range order at low temperatures - as occurs in both layered quantum magnets and geometrically-frustrated magnets.  I'll illustrate these phenomena borrowing results from the (upcoming) PhD and MSc theses of Kate Ross, Greg Van Gastel, and Jerod Wagman.

Host: John Dutcher