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CMP
Credit: Jack Hobhouse

David Keen

Visiting Professor

Sub department

  • Condensed Matter Physics

Research groups

  • X-ray and neutron scattering
david.keen@physics.ox.ac.uk
Telephone: 01865 (2)72310
Clarendon Laboratory, room 106
  • About
  • Publications

Structural investigations of amorphous metal–organic frameworks formed via different routes

Physical Chemistry Chemical Physics Royal Society of Chemistry (RSC) 20:11 (2018) 7857-7861

Authors:

DA Keen, TD Bennett
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Magnetic structure of paramagnetic MnO

Physical Review B American Physical Society 97:1 (2018) 014429

Authors:

JAM Paddison, MJ Gutmann, MT Dove, DA Keen, Andrew Goodwin

Abstract:

Using a combination of single-crystal neutron scattering and reverse Monte Carlo refinements, we study the magnetic structure of paramagnetic MnO at a temperature (160 K) substantially below the Curie-Weiss temperature |θ|∼550 K. The microscopic picture we develop reveals a locally ordered domain structure that persists over distances many times larger than the correlation length implied by direct analysis of the spin-correlation function. Moreover, the directional dependence of paramagnetic spin correlations in paramagnetic MnO differs in some important respects from that of its incipient ordered antiferromagnetic state. Our results demonstrate that atomistic refinement to large three-dimensional neutron-scattering datasets is a practical approach, and have implications for the understanding of paramagnetic states in weakly frustrated systems, including high-temperature superconductors.
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Liquid metal–organic frameworks

Nature Materials Springer Nature 16:11 (2017) 1149-1154

Authors:

Romain Gaillac, Pluton Pullumbi, Kevin A Beyer, Karena W Chapman, David A Keen, Thomas D Bennett, François-Xavier Coudert
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Direct visualization of critical hydrogen atoms in a pyridoxal 5′-phosphate enzyme

Nature Communications Springer Nature 8:1 (2017) 955

Authors:

Steven Dajnowicz, Ryne C Johnston, Jerry M Parks, Matthew P Blakeley, David A Keen, Kevin L Weiss, Oksana Gerlits, Andrey Kovalevsky, Timothy C Mueser
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Magnetic structure and spin-wave excitations in the multiferroic magnetic metal-organic framework (CD3)2ND2[Mn(DCO2)3]

Physical Review B American Physical Society (APS) 96:9 (2017) 094423

Authors:

HC Walker, HD Duncan, MD Le, DA Keen, DJ Voneshen, AE Phillips
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