Crystals with magnetic frustration and multiferroic coupling

• Název práce v češtině: Crystals with magnetic frustration and multiferroic coupling
• Název v anglickém jazyce: Crystals with magnetic frustration and multiferroic coupling
• Klíčová slova: Magnetism|Magnetic frustration|Quantum spin liquid
• Klíčová slova anglicky: Magnetism|Magnetic frustration|Quantum spin liquid
• Akademický rok vypsání: 2024/2025
• Typ práce: bakalářská práce
• Ústav: Katedra fyziky kondenzovaných látek (32-KFKL)
• Vedoucí / školitel: Ross Harvey Colman, Dr.

Zásady pro vypracování

1. Prepare polycrystalline samples by solid state sintering of oxide precursors.
2. Grow single crystal samples using optical floating zone methods.
3. Characterize sample by magnetometry and X-ray diffraction.
4. Trial flux growth of previously unknown gallates.
5. Write a report of the findings

Seznam odborné literatury

[1] Balents, L. Nature (2010) 464, 199.
[2] Y. Li, P. Gegenwart, and A. A. Tsirlin. Spin liquids in geometrically perfect triangular antiferromagnets. Journal of Physics: Condensed Matter, IOP Publishing 2020, 32, 224004. https://iopscience.iop.org/article/10.1088/1361-648X/ab724e
[3] Savary, L.; Balents, L. Quantum Spin Liquids: A Review. Reports Prog. Phys. 2017, 80 (1), 016502. https://doi.org/10.1088/0034-4885/80/1/016502
[4] M. Ashtar, M. A. Marwat, Y. X. Gao, Z. T. Zhang, L. Pi, S. L. Yuan, and Z. M. Tian. REZnAl11O19 (RE = Pr, Nd, Sm–Tb): a new family of ideal 2D triangular lattice frustrated magnets. J. Mater. Chem. C 2019, 7, 10073. http://dx.doi.org/10.1039/C9TC02643F
[5] X. Li, G.L. Tan, Multiferroic and magnetoelectronic polarizations in BaFe12O19 system, J. Alloys Compd. 858 (2021) 157722. doi:10.1016/j.jallcom.2020.157722.

Předběžná náplň práce

Magnetism is a fascinating research area, because it is a nice playground to study many body physics and statistical mechanics and also thanks to the possible applications in electronics or energy management. Frustrated magnets are magnetic materials, where all the magnetic interactions cannot be simultaneously satisfied and thus compete with each other.
Additionally, if a material is ferroelectric with coupling between the magnetism and ferroelectric order, we get multiferroic materials.
We have recently identified a series of rare-earth aluminates as potentially multiferroic, due to both their ferroelectric and magnetic ordering being on the same energy scale.
This project will involve attempts to grow single crystals of several members of this aluminate family, LnMgAl11O19 (where Ln = a lanthanide ion), followed by investigations of their magnetic and possibly ferroelectric properties (time permitting).
These materials can be prepared by optical floating zone methods. The possibility to extend this family to additional members LnZnAl11O19, or even gallates LnMgGa11O19, using flux growth synthesis may also be attempted within the project.

Předběžná náplň práce v anglickém jazyce

Magnetism is a fascinating research area, because it is a nice playground to study many body physics and statistical mechanics and also thanks to the possible applications in electronics or energy management. Frustrated magnets are magnetic materials, where all the magnetic interactions cannot be simultaneously satisfied and thus compete with each other.
Additionally, if a material is ferroelectric with coupling between the magnetism and ferroelectric order, we get multiferroic materials.
We have recently identified a series of rare-earth aluminates as potentially multiferroic, due to both their ferroelectric and magnetic ordering being on the same energy scale.
This project will involve attempts to grow single crystals of several members of this aluminate family, LnMgAl11O19 (where Ln = a lanthanide ion), followed by investigations of their magnetic and possibly ferroelectric properties (time permitting).
These materials can be prepared by optical floating zone methods. The possibility to extend this family to additional members LnZnAl11O19, or even gallates LnMgGa11O19, using flux growth synthesis may also be attempted within the project.