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 “"Fermi-liquid behaviour"”.
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High magnetic field study of strongly correlated electron systems
… of a strong magnetic field is a signature of Fermi liquid behaviour and can be used in conjunction with complementary experimental techniques to map the Fermi surface of a metal. For metallic states, the Fermi surface plays a central role in the understanding of correlated electron systems. In …
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Defect-induced magnetism and transport phenomena in epitaxial oxides
… are in fact responsible for the ferromagnetic behaviour. A relation between strain (related to defect concentration) and magnetisation is established. In the second part of this dissertation, artificially introduced defects are employed in order to discover the fundamental conduction mechanism …
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Pressure Induced Quantum Phase Transitions in Metallics Oxides and Pnictides
… from incoherent to conventional metallic behaviour at a T* > 150 K in the neighbourhood of Pc, suggesting a connection between the high and low temperature phases. The possibility of a topological semi-metallic ground state, predicted in recent theoretical studies, is explained. FeCrAs is …
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Unconventional Superconductivity in the Layered Iron Germanide YFe2Ge2
… dependence, which is an indication of non-Fermi-liquid behaviour. While superconductivity in YFe$_2$Ge$_2$ has been widely observed below $T_c \approx \SI{1.9}{\kelvin}$ in electric transport measurements, evidence of a bulk superconducting transition has proved elusive. This has prompted …
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Magnetic and Structural Instabilities in Cerium Diantimonides under Pressure
… of unconventional superconductivity and non-Fermi liquid behaviour at a quantum critical point at pc ≃ 32 kbar. A comprehensive series of high-pressure measurements have been employed to track the development of this structural transition, determine the high-pressure crystal structure and …
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An Investigation of the Magnetic and Electrical Properties of YNi3
… solidstate research because they demonstrate non-Fermi-Liquid behaviour and allow us to probe the quantum nature of the solid state in magnetic materials. Spin fluctuation theory is currentlythe most successful tool we have for trying to describe critical behaviour on the border of magnetism, and …
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Pressure Tuned Magnetism in d- and f-Electron Materials
… new states of matter, for example; the marginal Fermi Liquid and non Fermi Liquid states as well high T$_C$ cuprate and magnetically mediated superconductivity. In this thesis I present work on three materials in which it may be possible to tune the system through a magnetic QPT with the …
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Cooling an electron gas using quantum dot based electronic refrigeration
… are made by cooling the sample to 1.5 K with liquid Helium-4, to 300 mK with liquid Helium-3, or even down to a few mK using a dilution refrigerator. However, at lower temperatures the electron gas becomes increasingly decoupled from the lattice in which it resides. Below ~ 1 K the coupling …
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High pressure studies of superconductivity and anomalous normal states in novel quantum materials
… is not the case in Sb-II as it shows a quadratic Fermi liquid-like relation, suggesting the pinning of the phason mode. The phason-pinning is supported by the estimation of electron- phason coupling parameter λ~0.18, which is surprisingly small. Furthermore, we observed an anomalous first-order …
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Electrical resistivity of the kondo systems (Ce1−xREx)In3, RE = Gd, Tb, Dy AND Ce(Pt1−xNix)Si2
… and an overview of the physics of heavy-fermion and Kondo systems. Chapter 2 presents the experimental details used in this thesis. Chapter 3 report the effect of substituting Ce with moment bearing rare-earth elements RE = Gd, Tb and Dy in CeIn3, through x-ray diffraction (XRD) and …