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 13 of 13 for “"frustrated magnetism"”.
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Frustrated Magnetism in Strongly Correlated Electron Systems
A deep understanding of magnetism is essential for its application in magnetic semiconductors, spintronic devices and unconventional superconductors. In this work, we study magnetic structures and their corresponding excitations in several strongly correlated electron systems, where exotic …
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Low-dimensional and frustrated magnetism in complex lanthanide oxides
… exhibiting low-dimensional and/or geometrically frustrated magnetism. Materials displaying these phenomena are well studied as hosts for novel magnetic states such as spin liquids, and for applications such as magnetic refrigeration. In this thesis, three families of materials were studied in …
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Mocking quantum mechanics: Semiclassical and machine-learning approaches to frustrated magnetism
… that is able to overcome the sign problem for unfrustrated antiferromagnets. In addition to this main theme, I have been part of an experiment--theory collaboration on understanding the unique magnetoresistance properties of the classical frustrated magnet Ho2Ir2O7. We discovered a mechanism by …
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Electronic and Magnetic Characterization by Scanning Probe Microscopy: Frustrated Magnetism in Nd(0001) and the Electronic Structure of V2S3 Monolayers
Contains fulltext : 238532.pdf (Publisher’s version ) (Open Access)
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On numerical methods in quantum spin systems
… 1, I go over major milestones in the field of frustrated magnetism, how it fits into a larger category of condensed matter physics, and recent developments that provide context for the research projects presented in part II. Chapters 2 3 provide the reader with necessary concepts in physics of …
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Wonderland of frustration: Magnetic moments and itinerant electrons on the pyrochlore lattice
… lattice, looking at both the conventional frustrated magnetism as well as a less studied form of frustration known as kinetic frustration. We start at half-filling, where the magnetic moments in a Mott insulator are localised and interact through Heisenberg exchange. Classically, the …
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Investigation of the magnetic and magnetocaloric properties of complex lanthanide oxides
… magnetocaloric properties of the geometrically frustrated lanthanide garnets, where the magnetic $Ln^{3+}$ form corner-sharing triangles. First, the family of garnets $Ln_3A_2X_3$O$_{12}$, $Ln$ = Gd, Tb, Dy, Ho, $A$ = Ga, Sc, In, Te, $X$ = Ga, Al, Li are investigated. Changes to the single-ion …
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Investigation and Optimization of Extraordinary Electroconductance (EEC) Sensors & The Role of Magnetic Disorder in the Formation of Spin Glasses
… insight into the factors driving the frustrated magnetic system into a spin glass phase.</p>
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Dynamics of frustrated magnetic systems – Emergent fractals and anomalous magnetic noise in spin ice
… on one specific instance of a topological frustrated magnetic system: spin ice. Spin ice is one of the most thoroughly researched frustrated models, exhibiting exciting phenomena typical of topological matter – including an emergent gauge field description with fractionalised excitations …
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Ground states in artificial spin ice
… successfully used to understand the behavior of frustrated spin systems, particularly the class of magnetic pyrochlore oxides known as spin ice. Here I describe a series of experimental studies that further extend the usefulness of artificial spin ice. First, I outline a thermal annealing …
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Magnetotransport of connected artificial spin ice
… has been utilized to investigate geometrically frustrated systems like spin ice, a class of magnetic pyrochlore oxides. Here I detail measurements of the magnetotransport response of connected artificial spin ice to varying temperatures and magnetic fields. In the literature, transport …
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Orbital order in iron-based superconductors
… itinerant electrons, we find that the underlying magnetism is unfrustrated, consistent with the inelastic neutron scattering results. The thesis is organized as follows. We will first provide the necessary background knowledge of the iron-based superconductors in Chapter 1. As a preliminary, we …
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Inverse methods in quantum many-body physics
… which can occur at low temperatures in frustrated magnets and certain superconductors, and many-body localized (MBL) phases that do not obey the laws of thermodynamics, which can occur in interacting disordered magnets. Traditionally, such quantum phases of matter have been studied using …