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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

Illustrated formalisms for total scattering data: a guide for new practitioners. Corrigendum and addendum

Journal of Applied Crystallography International Union of Crystallography (IUCr) 54:5 (2021) 1542-1545

Authors:

Peter F Peterson, David A Keen
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Ionic liquid facilitated melting of the metal-organic framework ZIF-8

Nature Communications Springer Nature 12:1 (2021) 5703

Authors:

Vahid Nozari, Courtney Calahoo, Joshua M Tuffnell, David A Keen, Thomas D Bennett, Lothar Wondraczek
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Glassy behaviour of mechanically amorphised ZIF-62 isomorphs

Chemical Communications Royal Society of Chemistry (RSC) 57:73 (2021) 9272-9275

Authors:

Michael F Thorne, Adam F Sapnik, Lauren N McHugh, Alice M Bumstead, Celia Castillo-Blas, Dean S Keeble, Maria Diaz Lopez, Phillip A Chater, David A Keen, Thomas D Bennett
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Melting of hybrid organic–inorganic perovskites

Nature Chemistry Springer Nature 13:8 (2021) 778-785

Authors:

Bikash Kumar Shaw, Ashlea R Hughes, Maxime Ducamp, Stephen Moss, Anup Debnath, Adam F Sapnik, Michael F Thorne, Lauren N McHugh, Andrea Pugliese, Dean S Keeble, Philip Chater, Juan M Bermudez-Garcia, Xavier Moya, Shyamal K Saha, David A Keen, François-Xavier Coudert, Frédéric Blanc, Thomas D Bennett
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Spin-ice physics in cadmium cyanide

Nature Communications Royal Society of Chemistry 12 (2021) 2272

Authors:

Chloe S Coates, Mia Baise, Adrian Schmutzler, Arkadiy Simonov, Joshua Makepeace, Andrew Seel, Ronald I Smith, Helen Y Playford, David A Keen, Renée Siegel, Jürgen Senker, Ben Slater, Andrew Goodwin

Abstract:

Spin-ices are frustrated magnets that support a particularly rich variety of emergent physics. Typically, it is the interplay of magnetic dipole interactions, spin anisotropy, and geometric frustration on the pyrochlore lattice that drives spin-ice formation. The relevant physics occurs at temperatures commensurate with the magnetic interaction strength, which for most systems is 1–5 K. Here, we show that non-magnetic cadmium cyanide, Cd(CN)2, exhibits analogous behaviour to magnetic spin-ices, but does so on a temperature scale that is nearly two orders of magnitude greater. The electric dipole moments of cyanide ions in Cd(CN)2 assume the role of magnetic pseudospins, with the difference in energy scale reflecting the increased strength of electric vs magnetic dipolar interactions. As a result, spin-ice physics influences the structural behaviour of Cd(CN)2 even at room temperature.
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