Dr Ross Stewart

Group Leader - Excitations and Polarized Neutrons

Location R 3, 2. 26
Rutherford Appleton Laboratory ISIS Neutron and Muon Source
E-mail ross.stewart@stfc.ac.uk
Telephone (office) +44 (0) 1235 446287
Mobile (short code) 1990 (only works when dialed on site)

Introduction and profile

  • Group Leader: Excitations & Polarized Neutrons
  • Associate Fellow, Department of Physics, University of Warwick
 

Research and development interests

Magnetic structure and dynamics of frustrated magnets

Frustrated magnets are fascinating model systems in which the lattice topology and/or mixed magnetic interactions can lead to an extensively degenerate magnetic ground state.  This leads to novel magnetic structural and dynamical properties in these materials.  I have investigated various metallic frustrated systems (β-Mn, YMn2, LiV2O4, NbFe2) mainly using neutron polarization analysis,  inelastic neutron scattering and muon spin relaxation (μSR) techniques.  I am also interested in the magnetic structural and dynamical properties of antiferromagnetic pyrochlore lattice (Gd2Ti2O7, Gd2Sn2O7) and kagome lattice (volborthite, herbertsmithite) materials. This work is done in collaboration with Dr Jason Gardner (Univ. Indiana/NIST), Dr Georg Ehlers (SNS, Oak Ridge), Dr Joe Paddison (Georgia Tech.) and Dr. Andrew Goodwin (Oxford), addition to various other UK and international research teams.

Polarized Neutron Scattering

Between 1998 and 2008, I worked at the Institut Laue-Langevin in Grenoble, where I led the redesign and reconstruction of the diffuse scattering spectrometer, D7, as part of the ILL Millennium Programme.   I designed a novel supermirror spin-analyser array for D7 which provided a factor of 60 increase in count-rate of this instrument.  I now lead the ISIS Polarized Neutron group - which is able to produce highly polarized 3He neutron spin-filters for use on neutron beamlines (currently ISIS reflectometers and LARMOR).  Plans are underway to install polarized neutron capability onto the LET spectrometer in the near future.    

Skills, expertise and qualifications

MSci (St. Andrews) PhD (St. Andrews)

Professional activities: Memberships/External organisations

Associate Fellow of the Department of Physics, University of Warwick
Member of the Institute of Physics (CPhys MInstP)

Grants, awards, teaching and other activities

Teaching

Visiting lecturer on Neutron scattering, Dept. of Physics, University of Warwick
Lecturer for the Oxford School on Neutron Scattering
Teaching duties on the ISIS Neutron training course

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