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 33 for “"first order phase transition"”.
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Elastic and inelastic X-ray scattering studies of the low dimensional spin-1/2 quantum magnet TiOCl
… of the lattice dynamics associated with the transition. In this work we present an extensive study of a new one dimensional spin-Peierls compound, TiOC1. The magnetic susceptibility strongly indicates a singlet ground state, with two apparent anomalies observed at T, ,=65 K and Tc2=92 K. …
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QCD Equilibrium and Dynamical Properties from Holographic Black Holes
Strongly interacting matter undergoes a crossover phase transition at high temperatures and zero net-baryon density. A key question in Quantum Chromodynamics (QCD) is whether a dense quark-gluon system exhibits critical phenomena when breaking the balance between quarks and antiquarks. Lattice QCD …
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Topics in vacuum decay
… quantum tunneling and thermal jumps make the transition between the vacua possible. The transition happens through a first order phase transition started by nucleation of a bubble of the new vacuum. The outward pressure of the truer vacuum makes the bubble expand and consequently eat away more …
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Aspects of quantum criticality in itinerant electron ferromagnetic systems
… systems that exhibit a zero temperature magnetic phase transition. This thesis is mainly concerned with such quantum critical points and is an investigation into the various phenomena seen in the phase diagram of itinerant ferromagnetic systems. We apply a standard theory of itinerant quantum …
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The heat capacity of ammonium chloride near the order-disorder transition
… the behavior of ammonium chloride near the first order phase transition at 240K in terms of· a physical model that has singular and nonsingu1ar parts of the free energy coupled together. The singularity is normally associated with a second order phase transition, but it can lead to a first …
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The electroweak phase transition in models with gauge singlets
A strong first order phase transition is needed for generating the baryon asymmetry; and also to save it during the electroweak phase transition (EWPT). However this condition is not fulfilled within the Standard Model (SM), but in its extensions. It is widely believed that the existence of singlet …
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The principles of molecular gel formation
… into fibrous networks featuring highly ordered molecular packing. The building units of these structures are individual molecules experiencing hydrogen bonding and π-π stacking interactions, making them distinct from typical gels formed by aggregation of colloidal particles or …
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Phase behavior and phase transformation kinetics during electrochemical cycling of lithium transition metal olivine compounds
… Li-ion transport during the LiFePO4/FePO4 two-phase transformation during the charge-discharge process. This results initially in poor rate capability and making the practical utility of these compounds unclear. Numerous studies have attributed the rate capability of olivines purely to chemical …
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Quantum Monte Carlo studies of dense hydrogen and two-dimensional Bose liquids
… properties consistent with and suggestive of a first order phase transition with positive density discontinuity $(n\sb{\rm H2}<n\sb{\rm H+H}).$ In a separate study, we apply the variational and diffusion Monte Carlo techniques to study the ground state properties of two distinct, but related, …
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X-ray study of the ordering phase transition at the Cu3Au (111) surface
We have studied the phase transition at the (111) surface of Cu3Au by glancing incidence x-ray scattering. The experiment was designed to approach the general question of surface behavior near a bulk first order phase transition. We have studied three aspects of the phase transition: the surface …
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Exploring new materials for caloric cooling
… are explored by exploiting latent heat from first-order phase transitions in a smart polymer driven by stimuli unexplored in the field of calorics thus far. Despite displaying large thermally driven entropy changes (|∆S₀|) near superionic transitions, the superionic conductors studied here …
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Pairing and superfluidity in strongly interacting Fermi gases
… interactions. We obtain the homogeneous phase diagram of the two -component gas with resonant interactions. As a function of temperature and spin polarization the phase diagram shows first and second order phase transitions that merge at a tricritical point. At zero temperature a first …
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Finite size corrections to the equation of state for nuclear matter near the phase transition hadron gas to quark gluon plasma
… description of the hadron gas near the phase transition to quark gluon plasma. Existing thermodynamic models introducing a .correction due to the finite size of the particles are reviewed and discussed. A new model to describe dense nuclear matter is developed. The model takes into …
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Dielektriniai ir pjezoelektriniai batio3-pbzn1/3nb2/3o3 keramikų tyrimai /
… solid solution to alter BT characteristics. In order to further deepen the knowledge about relaxors and their interaction with ferroelectrics, this research focuses on investigation of barium titanate doped with lead zinc niobate ((1–x)BaTiO3-xPbZn1/3Nb2/3O3). During the study dielectric and …
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Interaction of non-equilibrium phonons with electron-hole plasmas in germanium
… plasmas in Ge at low temperature. The first two studies involve the low temperature fluid phase known as the electron-hole liquid (EHL). The third study involves a wider range of temperatures and includes the higher temperature electron-hole plasma (EHP). In the first experiment, …
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Dynamics of primordial phase transitions, primordial magnetic fields, and Big Bang nucleosynthesis
… cosmological consequences of a series of phase transitions which the universe may have undergone. Specially, I have studied the dynamics of primordial phase transitions, primordial magnetic fields, and Big Bang Nucleosynthesis. In particular, (1) I have derived the effects of magnetic …
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Fracture mechanics in the semigrand canonical ensemble
… The SGCMC approach permits identifying the full phase diagram of brittle fracture for harmonic and non-harmonic bond potentials, analogous to the gas-liquid phase diagram, with the equivalent of a liquidus line ending in a critical point. The phase diagram delineates a solid phase, a fractured …
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High field DNP and cryogenic MAS NMR : novel instrumentation and applications
… increasing the sensitivity of ssNMR by 1-2 orders magnitude, significantly extending the reach of ssNMR. Successful application of ssNMR/DNP at 5T and 9.4T stimulated interest to extending this technique to higher fields and new applications. Here, the progress toward this goal is presented. …
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Field Theoretical Approach to the Phases of QCD
The study of the phases of Quantum Chromodynamics (QCD), at finite temperature (T) and baryon chemical potential (mu_B), is one of the biggest challenges in theoretical physics and represents a significant step towards understanding the collective behavior of the strong force. The non-perturbative …
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Application of compressional cooling to the study of nuclear ordering in solid helium three
… technique for He3 has been used to observe ordering of the nuclear spins in solid He3 He3 atoms in the solid are localized at lattice sites. Interactions between neighboring atoms, due to zero point motion, are relatively small until temperatures in the low I millidegree Kelvin range are …
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