Studium magnetoelastických interakcí pomocí nepružného neutronového rozptylu
| Thesis title in Czech: | Studium magnetoelastických interakcí pomocí nepružného neutronového rozptylu |
|---|---|
| Thesis title in English: | Study of magnetoelastic interactions using inelastic neutron scattering |
| Key words: | nepružný rozptyl neutronů|magnetické vlastnosti|automatizace|laueho difrakce |
| English key words: | inelastic neutron scattering|magnetic properties|automatization|laue diffraction |
| Academic year of topic announcement: | 2024/2025 |
| Thesis type: | dissertation |
| Thesis language: | |
| Department: | Department of Condensed Matter Physics (32-KFKL) |
| Supervisor: | RNDr. Petr Čermák, Ph.D. |
| Author: | |
| Advisors: | RNDr. Michal Vališka, Ph.D. |
| Guidelines |
| 1. research on the topic of magnetoelastic materials
2. development of the research plan 3. development of the methodology of crystal coalignment using robotic device 4. crystal growth of studied materials and their co-alignment using robotic device 5. writing proposals to the neutron facilities and conducting experiments there 6. ongoing processing and interpretation of results 7. contribution to the preparation of publications 8. presentation of results at workshops or conferences 9. summarizing the results, writing the dissertation |
| References |
| 1. G. Shirane, S. M. Shapiro and J. M. Tranquada. Neutron scattering with a triple-axis spectrometer: basic techniques. Cambridge University Press, 2002.
2. A.T. Boothroyd. Principles of Neutron Scattering from Condensed Matter. Oxford University Press, 2020. 3. M. Born and R. Oppenheimer, Annalen der Physik, 389, 457-484 (1927) 4. P. Thalmeier and P. Fulde, Physical Review Letters, 49, 1588-1591 (1982) 5. P. Čermák, A. Schneidewind, B. Liu, M. M. Koza, C. Franz, R. Schönmann, O. Sobolev and C. Pfleiderer, Proceedings of the National Academy of Sciences of the United States of America, 116, (2019) 6. J. Gaudet, A. Hallas, C. Buhariwalla, G. Sala, M. Stone, M. Tachibana, K. Baroudi, R. Cava and B. Gaulin, Physical Review B, (2018) 7. M. Naji, N. Magnani, J.-Y. Colle, O. Beneš, S. Stohr, R. Caciuffo, R. J. M. Konings and D. Manara, Journal of Physical Chemistry C, 120, 4799-4805 (2016) 8. Čermák, P. Czech JUNIOR STAR GAČR Project application + evaluation. figshare (2021) https://doi.org/10.6084/m9.figshare.14256521.v1 and actual publications related to the topic |
| Preliminary scope of work |
| viz Anglická upoutávka |
| Preliminary scope of work in English |
| The Born–Oppenheimer approximation simplified condensed matter physics by separating the motion of atomic nuclei and much lighter electrons [3]. The violation of this concept was considered rare and lead to emergent functionalities such as multiferroicity, polar order and superconductivity. Several recent studies demonstrates an abundance of magnetoelastic (ME) interactions [4-7], revealing that interactions between nuclei and electrons are far more common. The hidden ME modes could be responsible for many unresolved inconsistencies across condensed matter physics. The thesis seeks to experimentally exploit ME modes in various intermetallic compounds using inelastic neutron scattering (INS), which is able to uniquely unveil ME modes [5].
Some compounds form only tiny crystals, too small for conventional INS. The student will use newly developed bespoke device for their precise co-alignment ALSA [8]. The goal of the thesis is to show, that ME effects are a general property of condensed matter and the Born-Oppenheimer approximation is surpassed far more often than generally thought The position is part of 5-years funded project MaMBA (https://mambaproject.cz/). |