Browsing M.Sc. Physics by Title
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Generalization of the BTK Theory to the Case of Finite Quasiparticle Lifetimes
(Brock University, 20130124)A generalization to the BTK theory is developed based on the fact that the quasiparticle lifetime is finite as a result of the damping caused by the interactions. For this purpose, appropriate selfenergy expressions and ... 
Histogram filtering as a tool in variational Monte Carlo optimization
(Brock University, 19990709)Optimization of wave functions in quantum Monte Carlo is a difficult task because the statistical uncertainty inherent to the technique makes the absolute determination of the global minimum difficult. To optimize these ... 
The infared optical properties of Sr2RuO4 and SmTiO3 including an objectoriented resistivity interface /
(Brock University, 19990521)The perovskite crystal structure is host to many different materials from insulating to superconducting providing a diverse range of intrinsic character and complexity. A better fundamental description of these materials ... 
Infrared Spectroscopy of Gadolinium
(20130410)Measurements of the optical reflectivity of the normal incident light along caxis [0001] have been made on a Gadolinium single crystal, for temperatures between 50 K and room temperature just above the Curie temperature ... 
Infrared spectroscopy of Mgdoped SrRuO3 thin films /
(Brock University, 20060601)The reflectance of thin films of magnesium doped SrRu03(MgSR0) produced by pulsed laser deposition on SrTiOa (100) substrates has been measured at room temperature between 100 and 7500 cm~^. The films were chosen to ... 
Interaction between vortices and impurities in a dwave superconductor /
(Brock University, 20050615)High temperature superconductors were discovered in 1986, but despite considerable research efforts, both experimental and theoretical, these materials remain poorly understood. Because their electronic structure is both ... 
KrAr laser Raman spectrometer for low temperature measurements /
(Brock University, 20040629)A Czerny Mount double monochromator is used to measure Raman scattered radiation near 90" from a crystalline, Silicon sample. Incident light is provided by a mixed gas KrAr laser, operating at 5145 A. The double ... 
La1xSrxMnO3 as a candidate for a room temperature pressure sensor /
(Brock University, 20030521)Perovskite manganite compounds, LaixDxMnOs (Ddivalent alkaline earth Ca, Sr or Ba), whose electrical and magnetic properties were first investigated nearly a half century ago, have attracted a great deal of attention ... 
Low frequency Raman scattering in amorphous materials: fused quartz, "pyrex" borosilicate glass and sodalime silicate glass
(Brock University, 19910709)Raman scattering in the region 20 to 100 cm 1 for fused quartz, "pyrex" borosilicate glass, and soft sodalime silicate glass was investigated. The Raman spectra for the fused quartz and the pyrex glass were obtained ... 
Magnetic and high pressure studies in the YPd5B3C3 system
(Brock University, 19950709)The macroscopic properties of the superconducting phase in the multiphase compound YPd5B3 C.3 have been investigated. The onset of superconductivity was observed at 22.6 K, zero resistance at 21.2 K, the lower critical ... 
Magnetic and transport properties of (Ba1xKx)Fe2As2
(Brock University, 20090128)Single crystals of (Bal  xKx)Fe2As2 were prepared using the Sn flux method. Two heating methods were used to prepare the single crystals: the slow heating and rapid heating methods. It was found that the single crystals ... 
Magnetic properties of the Biâ Srâ CaCuâ Oâ single crystal
(Brock University, 19910709)The Bi2Sr2CaCu20g single crystal with a superconducting transition temperature equal to 90 ± 2 K was prepared. The irreversibility line of the single crystal for a mgnetic field direction along the caxis and T* in the ... 
The measured variation of the DebyeWaller factor of aluminum from 295K to 815K by using the energy dispersive xray diffraction technique
(Brock University, 19920709)The Energy Dispersive Xray Diffraction System at Brock University has been used to measure the intensities of the diffraction lines of aluminum powder sample as a function of temperature. At first, intensity measurements ... 
Molecular dynamics calculation of mean square displacement in alkali metals and rare gas solids and comparison with lattice dynamics
(Brock University, 19840709)Molec ul ar dynamics calculations of the mean sq ua re displacement have been carried out for the alkali metals Na, K and Cs and for an fcc nearest neighbour LennardJones model applicable to rare gas solids. The ... 
Monte Carlo study of the XYmodel on quasiperiodic lattices
(Brock University, 19960709)Monte Carlo Simulations were carried out using a nearest neighbour ferromagnetic XYmodel, on both 2D and 3D quasiperiodic lattices. In the case of 2D, both the unfrustrated and frustrated XVmodel were studied. For ... 
NMR characterization of chlorhexidine in lipidbased formulations /
(Brock University, 20040714)A mixture of Chlorhexidine digluconate (CHG) with glycerophospholipid 1,2dimyristoyl <^54glycero3phospocholine (DMPCrf54) was analysed using ^H nuclear magnetic resonance. To analyze powder spectra, the dePakeing ... 
On the anharmonic, multiphonon, DebyeWaller contributions to the phononlimited resistivity of metals : applications to Na and K
(Brock University, 19790709)The anharmonic, multiphonon (MP), and OebyeWaller factor (OW) contributions to the phonon limited resistivity (;0) of metals derived by Shukla and Muller (1979) by the doubletime temperature dependent Green function ... 
On the equation of state and atomic mean square displacement of crystals
(Brock University, 19890709)We have presented a Green's function method for the calculation of the atomic mean square displacement (MSD) for an anharmonic Hamil toni an . This method effectively sums a whole class of anharmonic contributions to ... 
On the formulation and the calculation of the harmonic contributions to the DebyeWaller factor in metals (sodium)
(Brock University, 19790709)The algebraic expressions for the anharmonic contributions to the DebyeWaller factor up to 0(A ) and 0 L% ) £ where ^ is the scattering wavevector] have been derived in a form suitable for cubic metals with small ion ... 
On the path integral formulation and the evaluation of quantum statistical averages
(Brock University, 19790709)Four problems of physical interest have been solved in this thesis using the path integral formalism. Using the trigonometric expansion method of Burton and de Borde (1955), we found the kernel for two interacting one ...