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 10 of 10 for “"charge order"”.
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CHARGE ORDER AND STRUCTURAL TRANSITION IN TOPOLOGICAL SEMIMETAL FAMILY AAL4
… symmetry-breaking ground states including charge density wave (CDW) and magnetic order, respectively. SrAl$_4$ hosts a second transition at 94K that is hysteretic in temperature and is a structural transition to a monoclinic structure. Here I report on the charge density wave in SrAl$_4$ …
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On the competition of superconductivity, antiferromagnetism and charge order in the high-Tc compounds
Diese Arbeit läßt sich in zwei grobe Abschnitte gliedern. Der erste Teil umfaßt die Kapitel 1-3, in denen drei verschiedene Konzepte beschrieben werden, die zum Verständis stark korrelierter Vielteilchen-Systeme dienen. Dies sind zunächst einmal die SO(5)-Theorie in Kapitel 3, die den allgemeinen …
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Charge density wave incommensuration in tise2 systems measured with hard x-ray scattering
… 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 crystals tuned by three parameters: …
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X-Ray Scattering Studies of Charge and Orbital Ordering in Transition Metal Oxides
This thesis focusses on the phenomena of charge ordering and orbital ordering in transition metal oxides, using the technique of resonant x-ray diffraction (RXD). The technique is suited to such studies, as it provides an elemental and band specific probe of long range electronic correlations. …
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Characterization of collective phenomena in cuprate superconductors by momentum-resolved electron energy loss spectroscopy
… exotic topological insulators, and charge density wave materials, that exhibit emergent behavior that cannot be understood through current theories of metals and insulators. These materials are classified by the low temperature ordered phases these materials take on, and there may be …
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New features in the phase diagrams of the cuprate high-Tc superconductors mapped using strong magnetic fields
… distinct from the widely reported T* line and charge order, and potentially could be consistent with previous reports of a vertical boundary from electronic specific heat and ARPES.
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Photoinduced Dynamics Studied using Single-Shot Optical and Terahertz Spectroscopy
… of a persistent hidden quantum (H) phase in the charge density wave material 1T-TaS2. We demonstrate that the formation of this H phase is ultrafast, electronic in origin, and corresponds to a near-complete melting of the charge order. Furthermore, we identify a persistent increase in the optical …
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Quantum Materials based on the Kagome Lattice
… van Hove singularity and its connection to charge order in CsV3Sb5 (Chapter 7); and observation of the intricate competition between charge order and superconductivity in the kagome metal series (K,Rb,Cs)V3(Sb,Sn)5 (Chapter 8). I conclude the dissertation by outlining the remaining goals and …
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Manipulating superconductivity in cuprates with selective ultrafast excitation
… targeting phonon modes of cuprate materials in order to manipulate their superconducting behavior. However, the pathway by which the light interacts with the phonon and electronic degrees of freedom is distinct in each case. First, in Chapter 4, I present a study of resonant mid-infrared …
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Ladungs- und Orbitalordnungsphänomene in Übergangsmetalloxidverbindungen unter hydrostatischem Druck
The thesis is dealing with the investigation of charge and orbital order and their behaviour under external pressure. Therefore, a new pressure cell has been developed which allows the observation of superlattice reflections corresponding to the order phenomena under pressure using scattering of …