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 20 of 58 for “"exchange interactions"”.
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The Magnetic Exchange Interactions in Chromium Chalcogenide Spinels
… at the tetrahedral (A) sites the only magnetic interactions present are those between B-site ions. Despite such apparently simple circumstances a rich variety of magnetic behaviour is exhibited. For the oxides the ground state spin configurations are antiferromagnetic whilst for the selenides …
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Magnetic Exchange Interactions in Dimeric and Polymeric Transition-Metal Complexes
Made available in DSpace on 2014-12-10T23:01:56Z (GMT). No. of bitstreams: 1 7500322.pdf: 8703120 bytes, checksum: 0ff6934ab3825293fa62bede7fe83e77 (MD5) Previous issue date: 1974
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Magnetic Exchange Interactions and Mixed Valence Chemistry in Binuclear Transition Metal Complexes
… provide a simple system in which metal-metal interactions can be studied. The importance of understanding these interactions can be seen when one considers the myriad systems which possess such interactions: biological enzymes s
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Magnetic Exchange Interactions in Copper(ii) Complexes Propagated by Extended Bridging Groups
Made available in DSpace on 2014-12-13T20:10:31Z (GMT). No. of bitstreams: 1 7913450.pdf: 15299194 bytes, checksum: c129dafd0d89557b350ee995214b3bef (MD5) Previous issue date: 1978
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Dislocation core energies and magnetic exchange interactions from first-principles energy density method
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-12-01
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The role of N+ in the decay of the ring current during geomagnetic storms by means of charge exchange interactions
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01
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Electron Exchange Interactions in Dimeric Copper(ii) and Titanium(iii) Complexes and Electron Paramagnetic Resonance of a Highly Conducting Charge Transfer Salt
Made available in DSpace on 2014-12-13T20:09:57Z (GMT). No. of bitstreams: 1 7709047.pdf: 6942599 bytes, checksum: 2e39c4e349e9f21373cb78594eeca3a4 (MD5) Previous issue date: 1976
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Investigation of Frustrated Quasi-One-Dimensional Quantum Spin-Chain Materials
… and next-nearest-neighbour intrachain spin-exchange interactions. Despite the similarities between CuAs2O4 and CuSb2O4, they exhibit very different magnetic properties. In this thesis work, the physical properties of CuAs2O4 and CuSb2O4 are investigated using a variety of experimental …
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Exchange and superexchange interactions in quantum dot systems
… and experiments. In many quantum dot systems, exchange interactions are the primary mechanism used to control spins and generate entanglement. And exchange energies are normally positive, which limits control flexibility. However, recent experiments show that negative exchange interactions can …
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Magnetic ordering and spin wave dynamics in transition metal arsenides
… neutron scattering techniques to characterize exchange interactions in these materials. We discover a new ternary metallic arsenide Cu0.82Mn1.18As which crystallizes in the hexagonal crystal system and contains a frustrated in-plane triangular arrangement of Mn spins. We also identify the …
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Structural, magnetic and electric transport properties of metal substituted La₀.₇Sr₀.₃MnO₃
… explained by the competition between the double exchange and super exchange interactions, local John-Teller distortion, the dilution of magnetic ordering by the formation of AF clusters, the change of electron carrier density and band structure, and complex interactions between electrons, …
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Interaction and Mixing Effects in Two and One Dimensional Hole Systems
… in the valence band. The effects of Coulomb interactions in low dimensional electron systems are currently being studied extensively. Experiments presented in this thesis indicate the possible importance of Coulomb exchange interactions in both one and two dimensional hole systems …
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Microgmagnetics Study of "Seed" Induced Incoherent Magnetic Reversal in a Cobalt Element Array
… by the strong crystalline anisotropy and exchange interactions of cobalt. By exposing the element array to an applied magnetic field for a specific time, the domain wall moved along the easy axis and was pinned at a specific position. In this manner, the portions of the element array to be …
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Rapid materials discovery of ternary transition metal chalcogenides
… in Mn1−xFexPSe3 and K2MnS2−xSex. The competing exchange interactions caused by bond frustration due to cation substitution and anisotropy will be studied in Mn1−xFexPSe3 to reveal co-existing nanoscale magnetic phases in this solid solution. Second, the interplay between various exchange …
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A Correlated 1-D Monatomic Condensed Matter System: Experiment and Theory
… wave instability is assigned to erromagnetic interactions along the chain. Specifically, it is deduced that the instability is driven by spin -minority pin-exchange interactions predominately in the cobalt dxz/dyz orbitals. Beyond, shedding light on electron correlations in a physically …
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Optical and core-level X-ray spectroscopy of correlated two-dimensional materials
… requires detailed knowledge of the microscopic interactions/excitation spectra, methods to disentangle the individual roles of coexistent orders, and selective probes of symmetry-breaking within different coupled degrees of freedom. In this thesis, we demonstrate the utility and complementarity …
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Finite Ion Temperature, Plasma Rotation, and Electromagnetic Effects on Plasma Acceleration in the Magnetic Mirror Geometry
… field, heat conductivity, ionization, and charge-exchange interactions on plasma acceleration in the magnetic nozzle and mirrors. The plasma dynamics was studied using a quasi-2D model in the paraxial approximation in which the effects of the radial magnetic field Br were considered up to first …
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Nanocrystalline Fe-Pt alloys: phase transformations, structure and magnetism
… to remanence enhancement due to large effects of exchange interactions between the crystallites of the phases. The structure, magnetic properties and magnetisation reversal processes of these alloys are investigated. Experimentally observed phenomena are understood on the basis of a simple …
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The Role of Disorder in the Charge Dissociation and Recombination Processes of Organic Photovoltaic Materials
… into account electron and hole Coulombic and exchange interactions, lattice vibrations, and electron-phonon couplings. In addition, we examine the role of band-width and interfacial driving forces in determining the dissociation free energy of an electron/hole pair. With proper statistical …
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Model complexes for active sites of diiron metalloproteins, dioxygen reactivity and water effects
… Non-Heme Enzymes. Utilizing hydrogen bonding interactions and sterically bulky carboxylates, synthetic routes were developed to prepare the mononuclear iron(II) complexes with the vacant coordination sites for O₂ binding. Reactions of such complexes with O₂ resulted in rare asymmetric …
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