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 40 for “"High Temperature Superconductivity"”.
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Spin fluctuations and high-temperature superconductivity in the copper oxides
… reports studies of spin-fluctuation-induced superconductivity in the antiferromagnetically correlated copper oxide high temperature superconductors.
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Spin fluctuations and high temperature superconductivity in the copper oxides
… reports studies of spin-fluctuation-induced superconductivity in the antiferromagnetically correlated copper oxide high temperature superconductors. The spin fluctuation mechanism is first studied within a weak coupling approximation. It is shown that the retarded interaction between …
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High-temperature superconductivity in a family of iron pnictide materials
… worked to design a variety of methods to create high-quality samples of various Iron Pnictide superconductors, to dope them with various chemicals and to characterise the resulting crystalline samples. I discuss in depth the signature of good quality crystals and the various experiments that they …
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Measurement of the vortex depinning force in a high temperature superconductor
Introduction: Superconductivity is one of those subjects in physics that is as captivating theoretically as it is experimentally interesting. The dual driving force of commercial demand for high-temperature superconductors (HTSC's), coupled with the intense basic science interest in uncovering the …
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Experimental determination of the symmetry of the superconducting pairing state in yttrium barium copper oxide
… clue to the origin of the pairing mechanism for high temperature superconductivity in the cuprates. By probing the momentum space anisotropy of the phase of the superconducting order parameter, we can experimentally determine the symmetry of the superconducting pairing state in YBCO and …
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Magnetic super-exchange with ultra cold atoms in spin dependent optical lattices
… possible connection between the mechanism behind high temperature superconductivity and quantum magnetism. This thesis will focus on trapping cold bosonic atoms in spin dependent optical lattices to engineer a system that behaves according to the Hubbard model. By loading the atoms into a state …
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Charge Density Waves and Superconductivity in Rare Earth Compounds from First Principles
High-temperature superconductivity at ambient pressures has been a major goal in condensed matter physics for decades. For conventional superconductors, strong electron-phonon coupling and high frequency phonons are the key ingredients to realizing this. However, strong electron-phonon coupling …
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Resonant soft X-ray studies of charge orders in high-temperature cuprates with energy-resolving transition edge sensors
"The high-temperature superconductivity in cuprates has been intensely studied since 1986; however, many questions still remain unclear even with decades of efforts. The relation between emergent orders, such as charge (stripe) orders, in ""pseudogap"" regime and superconductivity is one of the …
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Quasi-one-dimensional magnetism in TiOCl and a theory of a lightly doped dimerized insulator
… have displayed fascinating new phenomena such as high temperature superconductivity and unconventional magnetism. The first part of this thesis is related to this rich and diverse subject, where TiOCl is studied as an example of an S = 1/2 layered Mott insulator. Earlier experiments on this …
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Temperature dependence of impurity resonances in cuprate superconductors
… prevents scattering of low energy electrons. In high temperature superconductors (HTS) an additional gap, the pseudogap, develops well above the superconducting transition temperature Tc. The identity of this pseudogap and its relationship to high temperature superconductivity is one of the most …
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Strongly-interacting fermions in an optical lattice
… for studying condensed matter phenomena like high temperature superconductivity.
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Femtosecond spectroscopy of coherent phenomena in quantum materials : a dissertation
… and lattice) lead to emergent phases such as high-temperature superconductivity, spin and charge density wave ordering and topologically protected 2D Dirac fermions. In the time-resolved experiments in this work, an initial laser 'pump' pulse drives the sample out-of-equilibrium by …
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Order Under Pressure: Structural and Magnetic Characterization at Extreme Stresses
… giving rise to functionality ranging from high-temperature superconductivity to diverse magnetism. Despite over a century of research on solid-state materials over one gigapascal (GPa), experimental and theoretical obstacles remain for structural and physical characterization of complex …
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High Pressure Studies of Superconductivity
<p>Superconductivity has been studied extensively since it was first discovered over 100 years ago. High pressure studies, in particular, have been vital in furthering our understanding of the superconducting state. Pressure allows researchers to enhance the properties of existing superconductors, …
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Metal-insulator transition in yttrium- and neodymium-doped lanthanum nickelates
Discovery of high-temperature superconductivity (SC) in (La,Ba)₂CuO₄ opened many lines of investigation into similar perovskite-related compounds, such as the square-planar “infinite-layer” superconductor, Sr₁₋ₓRₓCuO₂ (R = rare-earth element). Until recently, SC had not yet been found in any …
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Neutron Scattering Studies of Unusual Spin Structure and Local Correlation in Complex Oxides
… application of external stimulus (e.g. pressure, temperature, electric, or magnetic fields). Interest in CEMs is fueled by the richness of their novel properties (e.g. Colossal Magnetoresistance (CMR), Quantum Criticality, and High Temperature Superconductivity), the complexity of the underlying …
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Stability and superconductivity of light-atom systems under extreme pressure
The use of high pressure in physics provides access to unusual chemistry, rich phase behaviour, and various interesting phenomena. One of the most sought after phenomena of recent years is high-temperature superconductivity, which has been predicted in solid hydrogen and experimentally verified in …
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Inelastic light scattering studies of quantum phase transitions in CuxTiSe2 and multiferroic TbMnO3
… scattering techniques are used to probe the temperature- and magnetic-field-induced phase transitions of two strongly correlated systems – the magnetoelectric multiferroic TbMnO3 and the layered dichalcogenide TiSe2 . In general, strongly correlated materials have a strong coupling between …
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Slave particle study of the strongly correlated electrons
… and antiferromagnetism to the conventional superconductivity. However, in the last thirty years, many experiments including the fractional quantum Hall effect (QHE) have revolutionized our view of nature. For a system of electrons that is subject to a very strong interactions and/or strong …
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