| 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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Rosenkranz, S.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (5/5 displayed)
- 2023Cardiopulmonary exercise testing and echocardiography in the follow-up after acute pulmonary embolismcitations
- 2023Structure of charge density waves in La1.875 Ba0.125 CuO4
- 2020The subchalcogenides Ir₂In₈Q (Q = S, Se, Te): Dirac semimetal candidates with re-entrant structural modulation
- 2020Soft elastic constants from phonon spectroscopy in hole-doped Ba$_{1-x}$(K,Na)$_{x}$Fe$_{2}$As$_{2}$ and Sr$_{1-x}$Na$_{x}$Fe$_{2}$As$_{2}$citations
- 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
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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.