| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Zheng, H.
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Publications (9/9 displayed)
- 2019Acoustic phonon dispersion and diffuse scattering across the valence transition of <math><mrow><msub><mrow><mo>(</mo><mrow><mi mathvariant='normal'>P</mi><msub><mi mathvariant='normal'>r</mi><mrow><mn>0.85</mn></mrow></msub><msub><mi mathvariant='normal'>Y</mi><mrow><mn>0.15</mn></mrow></msub></mrow><mo>)</mo></mrow><mrow><mn>0.7</mn></mrow></msub><mi mathvariant='normal'>C</mi><msub><mi mathvariant='normal'>a</mi><mrow><mn>0.3</mn></mrow></msub><mi>Co</mi><msub><mi mathvariant='normal'>O</mi><mrow><mn>3</mn><mo>-</mo><mi>δ</mi></mrow></msub></mrow></math>citations
- 2017Graphene Oxide: An All-in-One Processing Additive for 3D Printing
- 2017Graphene Oxide: An All-in-One Processing Additive for 3D Printingcitations
- 2016Magnetic correlations in the extended kagome YBaCo4O7 probed by single-crystal neutron scattering.citations
- 2015Li 4 Ti 5 O 12 /graphene nanoribbons composite as anodes for lithium ion batteries
- 2013Direct measurement of coherency limits for strain relaxation in heteroepitaxial core/shell nanowirescitations
- 2007<i>In situ</i> Raman spectroscopy of A-site doped barium titanatecitations
- 2004Three-dimensional heteroepitaxy in self-assembled BaTiO 3- CoFe 2O 4 nanostructurescitations
- 2004Epitaxial BiFeO 3 thin films on Sicitations
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article
Acoustic phonon dispersion and diffuse scattering across the valence transition of <math><mrow><msub><mrow><mo>(</mo><mrow><mi mathvariant='normal'>P</mi><msub><mi mathvariant='normal'>r</mi><mrow><mn>0.85</mn></mrow></msub><msub><mi mathvariant='normal'>Y</mi><mrow><mn>0.15</mn></mrow></msub></mrow><mo>)</mo></mrow><mrow><mn>0.7</mn></mrow></msub><mi mathvariant='normal'>C</mi><msub><mi mathvariant='normal'>a</mi><mrow><mn>0.3</mn></mrow></msub><mi>Co</mi><msub><mi mathvariant='normal'>O</mi><mrow><mn>3</mn><mo>-</mo><mi>δ</mi></mrow></msub></mrow></math>
Abstract
A number of praseodymium-containing cobalt perovskites undergo temperature-dependent metal-insulator transitions that involve a transfer of electrons between cobalt and praseodymium cations. We have used high- resolution inelastic x-ray scattering to directly measure the changes in the acoustic phonon dispersion through this transition in one such single crystal, (Pr<sub>0.85</sub>Y<sub>0.15</sub>)(0.)7Ca<sub>0.3</sub>CoO<sub>3-</sub>, in an effort to understand the role of the lattice in the transition. Transverse and acoustic modes were measured in the pseudocubic (200), (220), and (222) zones both above and below the transition temperature. The resultant dispersion curves reveal that the transition is associated with a significant hardening of the pseudocubic C<sub>11</sub> elastic constant, whereas C<sub>12</sub> and C<sub>44</sub> do not significantly change. Here, analysis of the temperature-dependent damping of the longitudinal acoustic mode in the (200) zone reveals a peak in the damping at temperatures just above the transition temperature. Significant elastic diffuse scattering is also observed above the transition temperature, likely resulting from clusters in which the electron transfer is beginning to occur as a precursor to the phase transition. The presence of these clusters likely limits the phonon lifetimes, thus leading to the observed damping.