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 14 of 14 for “"TiSe2"”.
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Emergence of charge density wave domain walls above the superconducting dome in TiSe2
… fluctuations in some other order parameter. 1T-TiSe2 is a prototypical CDW material in the transtion-metal dichalcogenide family and was previously shown to exhibit SC when the CDW is suppressed by hydrostatic pressure or intercalation of Cu atoms. Here, we present detailed high pressure x-ray …
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Charge density wave incommensuration in tise2 systems measured with hard x-ray scattering
Unconventional superconductivity cannot be understood independently of the phases that order around it. Characterizing the charge order in modulated superconductors provides essential information that could reveal a common underlying mechanism. We performed low temperature experiments on 1T-TiSe 2 …
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Inelastic light scattering studies of quantum phase transitions in CuxTiSe2 and multiferroic TbMnO3
… TbMnO3 and the layered dichalcogenide TiSe2 . In general, strongly correlated materials have a strong coupling between charge, spin, lattice and orbital degrees of freedom. Because of the inter- play between various competing orders, these systems have highly complex phase diagrams and …
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Inelastic Light Scattering Studies of Quantum Phase Transitions in Copper Titanium Diselenium and Multiferroic Terbium Manganese Trioxygen
… is the study of quantum phase transitions in TiSe2 as a function of temperature and Cu-intercalation, and the comparison of the effects of intercalation and pressure on the charge-density-wave (CDW) order in this system. All these parameters---temperature, pressure and …
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STM Study of Interfaces and Defects in 2D Materials
… of the thesis focuses on the synthesis of 2D TiSe2 with chemical vapor transport (CVT). By properly choosing the growth condition, Sub-10 nm TiSe2 flakes were successfully obtained. A 2 × 2 charge density wave (CDW) was clearly observed on these ultrathin flakes by scanning tunneling …
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Collective modes in strongly correlated electron systems measured with momentum-resolved electron energy-loss spectroscopy
… is the transition metal dichalcogenide 1T-TiSe2, which has been proposed to contain a Bose condensate of excitons. Using M-EELS, we demonstrate the existence of an exciton condensate in TiSe2. Its experimental signature is a soft electronic collective mode that disperses to zero energy near …
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Collective excitations in layered materials with momentum-resolved electron energy loss spectroscopy
… Bi2Sr2CaCu2O8+d, a charge density wave material, TiSe2, and a topological insulator, Bi2Se3. It was determined that the bosonic origin of quasiparticle kinks often seen in angle-resolved photoemission studies can be identified using M-EELS. Lastly, the observation of a novel electronic collective …
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Magnetic Penetration Depth Analysis of Unconventional Superconductors
… Sn and Cd, and the layered dichalcogenide TiSe2 doped with copper. We seek to study the impact of antiferromagnetism and the presence of a quantum critical point on superconductivity. We also seek to characterize the superconductivity and compare to similar materials. Additionally we seek …
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Untersuchung der elektronischen Struktur quasi-zweidimensionaler Einlagerungsverbindungen
… liegt. Einkristalline Graphit-, TiSe2- und TaSe2-Proben wurden vor und nach der Interkalation mit winkelaufgelöster Photoemission, Fermi- und Isoenergieflächenmessungen und Elektronenbeugung (LEED) analysiert. Als Interkalationsmaterialien wurden U, Eu, Gd und Cs verwendet. Die …
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X-ray Studies of Lattice Dynamics
… phonon softening in charge density wave (CDW) TiSe2 and antiferrodistortive (AFD) SrTiO3. This thesis work helps to develop analysis of x-ray thermal diffuse scattering as a viable method for studies of lattice dynamics.
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Superlattice formation in group IV-B transition metal dichalcogenides
… show that a 2ao x 2co super1attice forms in TiSe2 at low temperature. Strong diffuse scattering is observed above T. An optically active far-infrared lattice mode is observed which c breaks up into several additional modes below the phase transition. In the infrared study, there is a dramatic …
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Surface studies of group IV-VI layered crystals
… ultraviolet radiation. The results indicate that TiSe2 a semimetal with a band overlap of less than 0.25 eV, while TiSi2 a semiconductor. These measured bands are in good agreement with recent theoretical band calculations.
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Studies in the theory of solids
… of TiS2 is ideal whereas the surface sandwich of TiSe2 expands outward slightly. 2 For the final qeterminations. the smoothing method was used on both the ·data and a theory which includes multiple scattering to confine the comparison to just the slowly varying surface dependent features. Chapter …
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Exploring the pressure- and magnetic-field-induced phases of orbital-ordering KCuF3 and single molecule magnet Mn12-acetate: Crystal growth and Raman scattering studies
… crystal samples of KCuF3, Mn12-acetate, 1T-TiSe2, and Bi2Se3 are also grown as part of this thesis work. Our experiments on KCuF3 provide evidence that the Kugel and Khomskii description of orbital ordering does not, by itself, explain orbital ordering behavior in this material, as is …