| 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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Weber, T.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (28/28 displayed)
- 2023Permittivity-asymmetric quasi-bound states in the continuum.citations
- 2021Herstellung hybrider Verbunde mittels Pressverfahren
- 2021Compaction efficiency of vibrating tampers based on model-accompanied dynamic measurements
- 2020Experimental and numerical impact analysis of automotive bumper brackets made of 2D triaxially braided CFRP compositescitations
- 2020Forming analysis of internal plies of multi-layer unidirectional textile preforms using projectional radiographycitations
- 2019Integration of piezoceramic composites into structural components: Effect on the polarisation state and polarisability
- 2018Experimental Investigation of the Frequency-Dependent Performance of Thermoplastic-Compatible Piezoceramic Modules (TPM)citations
- 2017Effect of the integration of piezoceramic composites into structural components on their poling condition and polarizability
- 2017Transverse acoustic phonon anomalies at intermediate wave vectors in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>MgV</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>citations
- 2017Experimental investigations on integrated conductor paths in fiber-reinforced thermoplastic composite structurescitations
- 2017Transverse acoustic phonon anomalies at intermediate wave vectors in MgV2O4
- 2016New manufacturing technology for material-hybrid lightweight solutions: An FRP-metal hybrid floor structure
- 2016Multiscale characterization and testing of function-integrative fiber-reinforced compositescitations
- 2016New manufacturing technology for material-hybrid lightweight solutions using an FRP-metal hybrid floor structure as example,Neue fertigungstechnologie für werkstoff-hybrid-leichtbau-lösungen am beispiel einer fvk-metall-hybridbodenstruktur
- 2015Experimental and numerical studies on integration thermoplastic composite compatible piezoelectric ceramics for actuatory application of cylindrical hollow structures
- 2014Photo-double-ionization of ethylene and acetylene near thresholdcitations
- 2014One vs. two piece customized implants to reconstruct mandibular continuity defects: A preliminary study in pig cadaverscitations
- 2013Weiterführende Technologieuntersuchungen zur Fertigung thermoplast-verbundkompatibler Piezokeramik-Module für adaptive Leichtbaustrukturen
- 2013Recent progress in research on tungsten materials for nuclear fusion applications in Europecitations
- 2013Recent progress in research on tungsten materials for nuclear fusion applications in Europecitations
- 2013Process chain modelling and analysis for the high volume production of thermoplastic composites with embedded piezoceramic modulescitations
- 2013Process development for high volume manufacture of novel thermoplastic-compatible piezoceramic modules
- 2013Evaluation of the pyroelectric response of embedded piezoelectrics by means of a Nyquist plotcitations
- 2012Experimental and numerical evaluation of crash and impact loaded textile reinforced thermoplastic components
- 2011Enhancing Sustainability Through the Targeted Use of Synergy Effects Between Material Configuration, Process Development and Lightweight Design at The Example of a Composite Seat Shellcitations
- 2011Unraveling the perplexing structure of the zeolite SSZ-57citations
- 2010Dielectric rear side passivation on Ribbon Growth on Substrate (RGS) solar cells
- 2008Numerical and experimental investigations on HYLITE sandwich sheets as an alternative sheet metalcitations
Places of action
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article
Transverse acoustic phonon anomalies at intermediate wave vectors in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>MgV</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
Abstract
Magnetic spinels (with chemical formula $A{X}_{2}{{O}}_{4}$, with $X$ a $3d$ transition metal ion) that also have an orbital degeneracy are Jahn-Teller active and hence possess a coupling between spin and lattice degrees of freedom. At high temperatures, ${{MgV}}_{2}{{O}}_{4}$ is a cubic spinel based on ${{V}}^{3+}$ ions with a spin $S=1$ and a triply degenerate orbital ground state. A structural transition occurs at ${T}_{{OO}}=63$ K to an orbitally ordered phase with a tetragonal unit cell followed by an antiferromagnetic transition of ${T}_{N}=42$ K on cooling. We apply neutron spectroscopy in single crystals of ${{MgV}}_{2}{{O}}_{4}$ to show an anomaly for intermediate wave vectors at ${T}_{{OO}}$ associated with the acoustic phonon sensitive to the shear elastic modulus $({C}_{11}{-}{C}_{12})/2$. On warming, the shear mode softens for momentum transfers near close to half the Brillouin zone boundary, but recovers near the zone center. High resolution spin-echo measurements further illustrate a temporal broadening with increased temperature over this intermediate range of wave vectors, indicative of a reduction in phonon lifetime. A subtle shift in phonon frequencies over the same range of momentum transfers is observed with magnetic fields. We discuss this acoustic anomaly in context of coupling to orbital and charge fluctuations.