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 35 for “"Heavy fermion"”.
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Elementary excitations in heavy-fermion superconductors
… is presented of the elementary excitations in heavy-fermion superconductors, under the hypothesis that the Cooper pairs are in a relative p-wave or d-wave. First, all p-wave and d-wave states are classified in the presence of strong spin-orbit coupling and crystal fields, which are important …
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Theoretical studies of heavy fermion materials
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 1986
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High-Pressure Studies of Some Heavy Fermion Materials
… presents the results of measurements on three heavy fermion materials under pressure: CeSb2, YbPtBi and CeAgSb2. In Chapter 1, I give an introduction to the key concepts involved in this work, such as unconventional superconductivity, quantum critical points and quantum oscillations, and I …
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Light scattering studies of heavy fermion and high Tc superconductors
… used to probe the diverse excitation spectra of heavy fermion and high T c superconductors. Our studies of heavy fermion compounds principally demonstrate the efficacy of using light scattering techniques to probe spin fluctuations and crystal field excitations in metals. For example, light …
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Light Scattering Studies of Heavy Fermion and High T(c) Superconductors
… used to probe the diverse excitation spectra of heavy fermion and high T$\sb{\rm c}$ superconductors.
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Investigation of superconducting order parameters in heavy-fermion and low-dimensional metallic systems under pressure
… them are included the high-Tc compounds, the heavy-fermion superconductors and as well the organic superconductors. It was the purpose of this work to probe different facets of superconductivity in heavy-fermion and in low-dimensional metallic compounds. This dissertation is divided into six …
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Development of High-Pressure Calorimetry Techniques and Calorimetry Study of the Heavy-Fermion Superconductor CeSb2
… pressure, CeSb<sub>2</sub> is a Kondo lattice heavy fermion material with a ferromagnetic ground state and various magnetic transitions at low temperatures. Between 6kbar and 16kbar, CeSb<sub>2</sub> undergoes a structural transformation that destroys the ferromagnetism, but reveals a new …
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Phases and phase transitions of strongly correlated electron systems
… uniformly. We try to track such phenomena in heavy fermion systems, which are correlated fermi liquids. In these systems, a lattice of localized electrons in f or d orbitals is coupled to the conduction electrons through an antiferromagnetic coupling. Singlets are formed between localized and …
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Field-induced magnetic phase transitions and correlated electronic states in the hexagonal RAgGe and RPtIn series
… symmetry. Moreover, a large number of Ce-based heavy fermion compounds have been studied, whereas the analogous Yb-based ones are much rarer. We thus wanted to study local moment metamagnetism and Yb-based heavy fermion physics in hexagonal systems.;The RAgGe and RPtIn series belonging to the …
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Electrical resistivity of the kondo systems (Ce1−xREx)In3, RE = Gd, Tb, Dy AND Ce(Pt1−xNix)Si2
… elements, 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 …
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Magnetic Penetration Depth Analysis of Unconventional Superconductors
… the skutterudites LaRu4Sb12 and LaOs4Sb 12, the heavy fermion superconductor CeIrIn5, a series of materials CeRh1-xIrxIn5, CeCoIn5 with two different dopants, Sn and Cd, and the layered dichalcogenide TiSe2 doped with copper. We seek to study the impact of antiferromagnetism and the presence of a …
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Transport and relaxation properties in anisotropic superconductors
… the superconducting state formed in some of the heavy fermion (HF) metals remains a subject of debate. In this thesis we give a theoretical analysis of some experiments which help to decide the issue. We give a detailed calculation of the nuclear spin relaxation time (T1 ) in anisotropic …
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Searching for novel objects in the electroweak theory
… temporally periodic configurations. We consider heavy fermion quantum fluctuations about static Higgs-Gauge configurations, and argue for the existence of stable fermionic solitons. These could resolve the fermion decoupling puzzle in chiral gauge theories. We describe our search for a fermionic …
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Cerium and rhodium substitution in the antiferromagnetic superconductor cerium rhodium indium(5)
Among heavy fermion materials, a relationship between unconventional superconductivity and magnetism has been observed. The dependence of the magnetic transitions of CexLa1-xRhyIr1-y In5 with respect to temperature and magnetic field applied along the tetragonal c and a crystal axes is examined …
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Penetration Depth Studies of Unconventional Superconductors
… at 21 and 28 MHz. The samples measured are the heavy-fermion superconductors CeCoIn5 and PrOs4Sb12, the rare-earth borocarbides RENi2B2C (RE = Y, Lu, Er, Ho), the spin-triplet superconductor Sr2RuO4, and elemental Pb. From these studies we see how superconductivity is affected by the presence of …
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Valence transition and superconductivity in the extended periodic Anderson model
… may lead to superconductivity in the Ce based heavy-fermion systems under high pressure.
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SANS investigations of the flux line lattice in unconventional superconductors
… by the anisotropy of the order-parameter. The heavy-fermion superconductor CeCoIn\(_5\) exhibits an exotic ground state that combines unconventional superconductivity with strong paramagnetism. With H || c, these properties contribute towards both a rich FLL structure phase diagram, and new …
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Investigation of "conventional" superconductivity in ternary cerium compounds through high pressure studies
… compounds where "conventional" (as opposed to heavy fermion) superconductivity has been observed to date;The closely related crystal structures (all related to the CeCo(,3)B(,2)-type, P6/mmm) enabled the study of the effect on superconductivity of transforming continuously from one system to …
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Quantum Tuning and Emergent Phases in Charge and Spin Ordered Materials
… in the high-T$_c$ superconductors and heavy-fermion systems, the appearance of the skyrmion magnetic vortex state in MnSi and magnetically mediated superconductivity in UGe$_2$. While detailed studies of many of the emergent phases have been made, there are still many gaps in …
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Search, Discovery, Synthesis and Characterization of Itinerant Magnets Composed of Non-magnetic Constituents
… phenomena that frequently accompany it: heavy fermion behavior, coexistence of superconductivity and magnetism, metamagnetic transitions, spin- and cluster-glass behavior, multisublattice magnetism, non-Fermi liquid behavior, and quantum criticality. Surprisingly, while many systems …
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