Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Geometric Frustration"”.
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Geometric frustration in high spin orbit coupling magnetic materials
Frustrated magnetic materials have long been a topic of intense research interest due to the variety of exotic states found in such systems. Here I present a study of the role of the local environment on two families of frustrated materials. The ferrimagnetic spinel $\mathrm{CoV_2O_4}$ has been a …
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An Exploration of Quantum Critical Phenomena in One-Dimensional Lattice Systems: Geometric Frustration & Quantum Fluctuations
… by the plethora of diverse features that geometric frustration may lead to, we will also examine the Bose-Hubbard model on a geometrically frustrated lattice. The lattice we will examine is a one-dimensional chain of rhombi and causes the particles to form pairs in the presence of …
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Fast ion conduction in solid electrolyte materials: An investigation of the relationship between lattice dynamics, geometric frustration induced disorder, and ionic conductivity
The student, William Gustafson, accepted the attached license on 2020-07-21 at 14:32.
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Bose-Hubbard physics in the kagome and triangular optical lattices at negative absolute temperature
… optical lattices. These lattices display geometric frustration, which manifests itself in a degeneracy at the upper edge of the ground band manifold. In the case of the triangular lattice, the band structure features two inequivalent energy maxima; in the kagome lattice, the upper band is …
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Exotic phenomena in rare-earth based geometrically frustrated magnets
… exotic ground states or quantum phases. Exchange frustration refers to when a system cannot simultaneously satisfy competing interactions, which can lead to a macroscopic degeneracy in the ground state of the system. Materials with geometric frustration, where competing interactions occur due to …
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Study of thermal kinetics in artificial spin ice systems
… array of nanomagnets fabricated to study geometric frustration, a phenomenon that arises when competing interactions cannot be simultaneously satisfied within the system. While the ground states of these artificial systems have been previously studied, this thesis focuses on the dynamic …
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Topological phases in narrow-band systems
… the fractional quantum Hall effect using geometric frustration and ferromagnetism to obtain a nearly flat band with a large bandgap and non-zero Chern number. This system can support this effect at high temperatures upon partial filling of the flat band. The second proposal builds upon …
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Geometric and Topological Aspects of Soft & Active Matter
<p>Topological and geometric ideas are now a mainstay of condensed matter physics, underlying much of our understanding of conventional materials in terms of defects and geometric frustration in ordered media, and protected edge states in topological insulators. In this thesis, I will argue that …
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An Exploration of Bonding in V_1−x Mo_x O_2 (x ≤ 0.53) and Other Compounds
… order can now be seen as the result of geometric frustration. This explains VO\(_2\)'s negative lattice anomaly. The total collapse of long-range three-dimensional order seems to occur around the same concentration that the lattice anomaly switches sign, identifying it as a potential …
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Negative temperature states of bosons in triangular and kagome lattices
… the states with the highest energy. Due to geometric frustration, the highest energy states are Bloch states at the K and K′ points for the triangular lattice and the states in the flat band for the kagome lattice. We show that negative temperature states are stable on the experimental …
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Magnetic-field- and pressure-tuned phases in LaxPryCa1−x−yMnO3 and Mn3O4: inelastic light scattering studies and single crystal growth
… interplay between strong spin-orbital coupling, geometric frustration, and applied magnetic field in these materials. In the thesis study, not only do I elucidate the rich phases and phase transitions sensitively tunable with doping, magnetic field, and/or pressure, but also demonstrate that …
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Rapid materials discovery of ternary transition metal chalcogenides
… chemical substitution which will result in spin frustration thereby resulting in new magnetic ground states. Examples here will include the bond and geometric frustration in Mn1−xFexPSe3 and K2MnS2−xSex. The competing exchange interactions caused by bond frustration due to cation substitution and …
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Transition metal oxide layered materials as catalyst and precatalyst for green energy applications: Oxygen evolution reaction and Fischer-Tropsch synthesis
… of relevant water fluctuations due to geometric frustration leading to enhanced electron transfer rate in the oxidation step of water splitting. Furthermore, lithium cobalt oxide (LiCoO2) and Co-doped birnessite were explored for their competence as precatalysts for Fischer-Tropsch …
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TWO-DIMENSIONAL FLUIDIZATION OF NANOMATERIALS VIA BIOMIMETIC MEMBRANES TOWARDS ASSISTED SELF-ASSEMBLY
… building blocks into larger structures of higher geometric and functional complexity has proven to be much more challenging. Yet, this is exactly what is required for many applications that have transformative potential for new technologies. If the tedious procedure to sequentially position …
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On the electronic structure of layered sodium cobalt oxides
… trigonal coordination of the Co sites results in geometric frustration which favours unconventional electronic ground states. The geometrically frustrated CoO2 sublattice also exists in the nonhydrated parent compound NaxCoO2, which has been investigated in this work. The intercalation of water …