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 124 for “"C-axis"”.
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The influence of coulomb potential fluctuation on c-axis tunneling in cuprates
… this thesis is studying the resistivity along c-axis direction in cuprates, layered high-temperature superconducting materials as a function of temperature. A point-to-point tunneling model is built to describe the tunneling between two CuO2 planes including the in-plane Coulomb interaction. With …
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Far infared reflectance along the C-axis of the charge stripe superconductor La1.875Ba0.125CuO4.
Reflectance measurements along the c-axis of La1.875 Bao.125CU04 at temperatures above(6K) and below(O.5K) the bulk superconducting transition temperature(3K) were performed using a Bruker rapid scan spectrometer and a Martin-Puplett polarizing spectrometer. It was found that when polarized light …
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Interlayer optical response of yttrium barium (copper (cobalt, zinc)) oxide
… x}.$ A dramatic decrease in the low-frequency c-axis optical conductivity, $\sigma\sb{\rm c}(\omega),$ is observed with either O reduction or Co substitution, suggesting that structural changes in the Cu(1)-O(4)-Cu(2) complex between the CuO$\sb2$ bilayers dominate the doping dependence of …
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Nanoscale Coherent-Acoustic-Phonon Dynamics in Molybdenum Disulfide Using Ultrafast Electron Microscopy
… (7 nm/ps). When viewed along a high-index zone axis (i.e., large angle between specimen normal and the incident electron wave vector), the observed diffraction-contrast dynamics exhibits no propagations but only oscillations. Such specimen configuration allows for projection of c-axis wave …
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Growth, transport, and tunneling spectroscopy of Y1̳-̳x̳Prx̳Ba2̳Cu3̳07̳ thin films as a function of crystallographic orientation
… are fabricated on thin films grown by off-axis magnetron sputter deposition from single, stoichiometric targets. Four crystallographic orientations are grown: (100), (110), (103), and (001). Four different Pr concentrations are studied where x=O, 0.2, 0.4, and 0.5, corresponding to zero …
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In-liquid bulk acoustic wave resonators for biosensing applications
… longitudinal mode resonance in $\textit{c}$-axis oriented piezoelectric films suffers from more than 90% damping in liquid; the alternative is the shear mode resonance, with lower damping in liquid but which requires an inclined $\textit{c}$-axis piezoelectric film, a process that is still …
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Magnetic studies of epitaxial neodymium
… orientations: some with the crystallographic c axis perpendicular to the film and some with the crystallographic b axis perpendicular to the film. The films exhibit unexpected structural and magnetic properties. The crystal structures agree with lattice types known to be exhibited by bulk …
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Thermal Structure of Mid-Crustal Shear Zones
Analysis of quartz c-axis fabrics and microstructures from ductily deformed rocks allows for the examination of the kinematics associated with crustal deformation. This thesis expands on the current knowledge of the kinematic evolution of the Himalayas and Scottish Caledonides, by examining samples …
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Growth, Characterization and Measurement of Epitaxial Sr2RuO4 Thin Films
In this thesis, the growth of c-axis oriented Sr2RuO4 thin films using pulsed laser deposition and their electrical transport properties are systematically discussed. The deposition and optimization process involved several progressive steps. Specifically, the first focus was on the Sr2RuO4 phase …
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Brillouin scattering from single-crystal dysprosium and gadolinium films
… and guided acoustic waves have been studied in c-axis single-crystal Dy films grown on sapphire substrates with Nb (or Ta) and Y buffer layers. The room temperature data compared very well with the dispersion of acoustic phonon velocities calculated using the bulk elastic constants in the elastic …
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Development of a multi-tier system for the analysis of ice crystallography of Antarctic shelf ice
… in these regions, with a specific focus on c-axis orientations and grain sizes. This approach encompasses the design of an analytical apparatus, methodologies for ice core collection and analysis, and the development of automation software to facilitate the analysis process. The study achieves …
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Numerical modelling of current transfer in nonlinear anisotropic conductive media
… presents modelling of current transfer between c-axis, low-angle c-axis and edge-on c-axis tilt oriented grain interfaces; the principal current transfer paths between individual current elements of the microstructural models of current flow in polycrystalline HTSs.
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Enhancement Of Magnetic Vortex Pinning by APCs with Coherent BZO 1D-APC/YBCO Interface
… the difference in pinning force generated by c-axis (direction of film growth) aligned one-dimensional (1D) APC fabricated with BaZrO3 (BZO) on one hand and BaHfO3 (BHO) on the other. A considerably higher pinning force density (Fp) was observed on the BHO 1D-APCs, which was attributed to a less …
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The growth and characterisation of ordered arrays of zinc oxide nanostructures and optical studies of defects in zinc oxide
In this work the growth of c-axis aligned zinc oxide nanorods on non-epitaxially matched substrates is examined. Nanorod arrays were deposited on silicon by seeding and chemical bath deposition (CBD), carbothermal vapour phase transport (CTR-VPT) and a hybrid CBD / CTR-VPT method. The best optical …
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A study of microfabric and structures in glacial ice: insights from Storglaciären, northern Sweden
… orientation, little internal distortion, and c-axis crystallographic preferred orientations (CPOs) defined by several maxima. Such fabrics develop in warm ice (T> -10 o C). They are difficult to quantify and interpret in part because the large grain size and interlocking texture creates issues …
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Growth, Transport, and Tunneling Spectroscopy of Y(1-X) Pr(x) Ba(2) Cu(3) O(7) Thin Films as a Function of Crystallographic Orientation
… are fabricated on thin films grown by off-axis magnetron sputter deposition from single, stoichiometric targets. Four crystallographic orientations are grown: (100), (110), (103), and (001). Four different Pr concentrations are studied where x = 0, 0.2, 0.4, and 0.5, corresponding to zero …
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Raman Scattering Studies of the Orbital, Magnetic, and Conducting Phases in Double Layer Ruthenates
… changes the lattice parameter along the c-axis and also adds an extra electron, providing bandwidth and band filling control, respectively. This addition of La also lowers the orbital ordering temperature to T ∼ 43 K, and provides a greater sensitivity of the orbital phases to applied …
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Structural and Electromagnetic Study of Heavily Doped ZR-Added REBCO Coated Conductors Fabricated by Reel-To-Reel MOCVD
… the optimum chemical composition and the REBCO c-axis lattice parameter has been an important objective to create self-assembled growth of elongated perovskite oxide nanostructures at different Zr dopant levels. Maintaining an optimal texture of the epitaxial REBCO film amidst a high density of …
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Critical current anisotropy in high temperature superconductors
… in HTS. The use of thin films grown on off c-axis (vicinal) substrates allowed the effect of current directions outside the cuprate planes to be studied. With this experimental geometry Berghuis, et al. (Phys. Rev. Lett. 79, 12, pg. 2332) observed a striking flux channelling effect in vicinal …
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High-field SANS studies of the vortex lattice in YBCO
… range 1–11T applied parallel to the crystal c-axis. The experiments revealed a field-induced continuous transition from a distorted London-like vortex lattice at 1T, to an unconventional square vortex lattice with a slight rectangular distortion. It is clear from the data that some kind of …
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