Dr Russell Ewings

Location R 3, 2. 06
Rutherford Appleton Laboratory
E-mail russell.ewings@stfc.ac.uk
Telephone (office) +44 (0) 1235 445896
Mobile (short code) 1471 (only works when dialed on site)

Research and development interests

At ISIS I am jointly responsible for the MAPS direct geometry chopper spectrometer, and am project scientist for the guide and disk chopper upgrades. I am also coordinating a project to upgrade some of the components of the ALF alignment diffractometer.

 

In addition, I have a strong involvement in the development of software for analysis and visualisation of data from time-of-flight chopper spectrometers in the excitations group. The main project on which I work is the Horace suite of programs. These are used to analyse large datasets that are generated when multiple measurements of the scattering from a single crystal in slightly different orientations are made. This technique has now become standard at many facilities around the world. In addition I am involved with advising the Mantid project, specifically on the VATES toolkit for data visualisation and analysis.

 

For more information about the software, visit the dedicated websites for the project: 

Horace

Mantid

 

Scientifically, I am interested in high-temperature superconductivity, especially that found in the cuprates and iron-pnictides. My work on the former has focussed on understanding the nature of so-called "stripe order", whereas on the latter we have been working on understanding the relationship between spin fluctuations and superconductivity. See the following papers for details:

"Strong (pi,0) spin fluctuations in beta-FeSe observed by neutron spectroscopy"

"Spin fluctuations away from (pi,0) in the superconducting phase of molecular-intercalated FeSe", Phys. Rev. B 87, 220508 (2013)

"Spin-wave excitations and superconducting resonant mode in CsxFe2-ySe2", Phys. Rev. B 86, 094528 (2012)

"Antiferromagnetic spin fluctuations in LiFeAs observed by neutron scattering", Phys. Rev. B 83, 220514(R) (2011)

"Itinerant Spin Excitations in SrFe2As2 Measured By Inelastic Neutron Scattering", Phys. Rev. B 83, 214519 (2011)

"High-energy spin excitations in BaFe2As2 observed by inelastic neutron scattering", Phys. Rev. B 78, 220501(R) (2008)

"Nature of the Magnetic Order in the Charge-Ordered Cuprate La1.48Nd0.4Sr0.12CuO4", Phys Rev Lett 98, 197003 (2007)

 

I have also worked extensively on strongly correlated manganese oxide compounds, in particular multiferroic materials, i.e. materials which display coupling between magnetic and electric properties. I have used neutron and x-ray resonant scattering in order to understand the complex magnetic order of materials which can contain magnetic rare earth as well as magnetic transition metal atoms.

"Magnetic structure of DyMn2O5 determined by resonant x-ray scattering", Phys. Rev. B 85, 224403 (2012)

"X-ray Resonant Diffraction Study of Multiferroic DyMn2O5", Phys Rev B 77, 104415 (2008)

"X-ray Scattering Study of the Order Parameters in Multiferroic TbMnO3", Phys Rev B 76, 184420 (2007)

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