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Crystal structure determinations of Zr Rich-PbZr1-x Ti x O3

Ferroelectrics 414:1 (2011) 147-154

Authors:

H Yokota, N Zhang, PA Thomas, AM Glazer

Abstract:

TOF experiments were carried out at room temperature and high temperature for Zr rich PbZr1-xTixO3 powders. The best R-factors were obtained with a mixture of R3c and Cm phases. The composition of the Cm phase monotonically increases towards the MPB. At high temperature in the cubic phase, the ADPs for the Pb atom become smaller when Pb displacements along either >110111
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Structural investigation of LN/LT1 superlattice thin films by field effect scanning transmission electron microscopy equipped with electron disspersive x-ray spectroscopy

Institute of Electrical and Electronics Engineers (IEEE) (2011) 1-4

Authors:

T Kobata, G Tsukahara, Y Uesu, S Huband, S Gorfman, D Walker, P Thomas, H Yokota, M Glazer, A Bartasyte
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Reversible pressure-induced amorphization of a zeolitic imidazolate framework (ZIF-4).

Chemical communications (Cambridge, England) 47:28 (2011) 7983-7985

Authors:

Thomas D Bennett, Petra Simoncic, Stephen A Moggach, Fabia Gozzo, Piero Macchi, David A Keen, Jin-Chong Tan, Anthony K Cheetham

Abstract:

We report the reversible pressure-induced amorphization of a zeolitic imidazolate framework (ZIF-4, [Zn(Im)(2)]). This occurs irrespective of pore occupancy and takes place via a novel high pressure phase (ZIF-4-I) when solvent molecules are present in the pores. A significant reduction in bulk modulus upon framework evacuation is also observed for both ZIF-4 and ZIF-4-I.
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Femtosecond dynamics of the collinear-to-spiral antiferromagnetic phase transition in CuO

(2011)

Authors:

SL Johnson, RA de Souza, U Staub, P Beaud, E Möhr-Vorobeva, G Ingold, A Caviezel, V Scagnoli, WF Schlotter, JJ Turner, O Krupin, W-S Lee, Y-D Chuang, L Patthey, RG Moore, D Lu, M Yi, PS Kirchmann, M Trigo, P Denes, D Doering, Z Hussain, Z-X Shen, D Prabhakaran, AT Boothroyd
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Antiferromagnetic spin fluctuations in LiFeAs observed by neutron scattering

Physical Review B - Condensed Matter and Materials Physics 83:22 (2011)

Authors:

AE Taylor, MJ Pitcher, RA Ewings, TG Perring, SJ Clarke, AT Boothroyd

Abstract:

We report neutron inelastic-scattering measurements on the stoichiometric iron-based superconductor LiFeAs. We find evidence for (i) magnetic scattering consistent with strong antiferromagnetic fluctuations and (ii) an increase in intensity in the superconducting state at low energies, similar to the resonant magnetic excitation observed in other iron-based superconductors. The results do not support a recent theoretical prediction of spin-triplet p-wave superconductivity in LiFeAs but instead suggest that the mechanism of superconductivity is similar to that in the other iron-based superconductors. © 2011 American Physical Society.
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