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Lattice dynamics of119Sn impurity in a bcc-Cr crystal
Stanisław M Dubiel1, Michael Y Hu2, Małgorzata Sternik3
1AGH University of Kraków, Faculty of Physics and Applied Computer Science, Kraków, PL 30-059, Poland.
Nuclear resonance inelastic x-ray scattering reveals how magnetic order in chromium affects lattice dynamics. Doping chromium with tin isotopes showed local modes with increased energies due to reduced interatomic distances.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nuclear Physics
Background:
- Chromium (Cr) exhibits complex magnetic ordering, influencing its physical properties.
- Understanding lattice dynamics is crucial for characterizing material behavior.
Purpose of the Study:
- To investigate the influence of magnetic order on the lattice dynamics of chromium.
- To study the vibrational properties of tin (Sn) isotopes in a chromium matrix.
Main Methods:
- Nuclear resonance inelastic x-ray scattering (NRIS) was employed to probe lattice dynamics.
- First-principles calculations were performed to model the system.
- Sn partial phonon density of states (PDOS) was measured at various temperatures corresponding to different magnetic states of Cr.
Main Results:
- A distinct peak at 39 meV in the Sn partial PDOS was observed only in magnetically ordered phases of Cr.
- This indicates that magnetic order significantly influences lattice dynamics.
- Calculated PDOS with antiferromagnetic order showed excellent agreement with experimental data.
Conclusions:
- The study confirms the impact of magnetic ordering on chromium's lattice dynamics.
- High-energy phonon peaks, attributed to local modes, arise from reduced Sn-Cr interatomic distances.
- First-principles calculations successfully reproduce experimental findings, validating the model.
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