D
David A. Keen
Researcher at Rutherford Appleton Laboratory
Publications - 222
Citations - 10962
David A. Keen is an academic researcher from Rutherford Appleton Laboratory. The author has contributed to research in topics: Neutron diffraction & Reverse Monte Carlo. The author has an hindex of 49, co-authored 206 publications receiving 9124 citations. Previous affiliations of David A. Keen include University of Oxford.
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Magnetoresistance measurements on the magnetic semiconductor Nd0.5Pb0.5MnO3
TL;DR: In this paper, magnetoresistance data up to 20 T and magnetisation measurements on the mixed-valence cubic perovskite semiconductor Nd 05 Pb 05 MnO 3 were presented, which demonstrated that the material orders ferromagnetically below 184 K and that around and above this temperature the conductivity is dominated by hopping of localized magnetic polarons, with an activation energy ∼95 meV.
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Colossal Positive and Negative Thermal Expansion in the Framework Material Ag3[Co(CN)6]
Andrew L. Goodwin,M. Calleja,Michael J. Conterio,Martin T. Dove,John S. O. Evans,David A. Keen,David A. Keen,Lars Peters,Matthew G. Tucker +8 more
TL;DR: This study illustrates how the mechanical properties of a van der Waals solid might be engineered into a rigid, useable framework.
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A comparison of various commonly used correlation functions for describing total scattering
TL;DR: A consistent set of equations for total-scattering correlation functions are developed and explicitly compared with other, often encountered, definitions to lead to increased transparency for newcomers to the field of total scattering.
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RMCProfile: reverse Monte Carlo for polycrystalline materials.
TL;DR: The new program RMCProfile represents a significant advance in the analysis of polycrystalline total scattering data, especially where the local structure is to be explored within the true constraints of the long-range average structure.
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The crystallography of correlated disorder
David A. Keen,Andrew L. Goodwin +1 more
TL;DR: This work has shown that correlated disorder nevertheless has clear crystallographic signatures that map to the type of disorder, irrespective of the underlying physical or chemical interactions and material involved.