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Now showing items 11-20 of 95
Transição ordem-desordem da matéria de vórtices em supercondutores detectada através do terceiro harmônico da suscetibilidade AC
(Universidade Federal de São Carlos, 2008-12-01)
Although a vortex state, in type II superconductors, has been anticipated more than 50 years ago, a great deal of theoretical and experimental efforts has still been done in an attempt to investigate how the dynamics of ...
Seções de choque diferenciais absolutas para o espalhamento elástico de elétrons de energias baixas e intermediárias por moléculas poliatômicas em fase gasosa
(Universidade Federal de São Carlos, 2002-05-27)
In this work we report absolute elastic differential cross sections (DCS) measurements for electron collisions with OCS, CO2, CH4, NO, N2O, CHF3 e C2F6 molecules in gas phase. The measurements cover the angular range from ...
Estudos por espectroscopia Raman da heteroestrutura semicondutora InxGa1-xP/GaAs.
(Universidade Federal de São Carlos, 2005-03-24)
In this work, the technique Raman spectroscopy is used in order to study
InxGa1-xP films grown with different thickness on GaAs (001). Two sets of samples grown
by CBE (Chemical Beam Epitaxy) were analized: the first a ...
Influência de solutos intersticiais em nióbio e ligas nióbio-zircônio.
(Universidade Federal de São Carlos, 2005-07-20)
Metals of body-centered cubic structure that contain heavy interstitial solutes, such as oxygen
and nitrogen in solid solution, present anelastic relaxation peaks when submitted to cyclic tensions,
due to the process called ...
Estudos de propriedades de muitos corpos em sistemas confinados : simulacões via Monte Carlo Quântico
(Universidade Federal de São Carlos, 2009-08-28)
The Quantum Monte Carlo Method has been constituted in a powerful ab-initio tool which can afford accurate estimates of the ground-state properties of quantum many-body systems. With this subject in mind, we first present ...
Engenharia de interações fônon-fóton-matéria mediadas por um campo clássico.
(Universidade Federal de São Carlos, 2004-04-30)
In this work we consider the problem of a three-level trapped ion inside a high-
Q cavity. We study the process of phonon-foton-matter interaction mediated by a
classical field. We are particularly interested in the ...
Simulações computacionais de sistemas eletrônicos em geometrias confinadas
(Universidade Federal de São Carlos, 2008-06-27)
In this work, structural and dynamic properties of a two-dimensional electron system trapped to helium film, deposited on a solid substrate, are determined through molecular dynamics simulation. The influence of the film ...
Efeitos anarmônicos e transições de fase em Pb1¡xLaxTiO3: estudo por espalhamento Raman dos efeitos de substituição catiônica, temperatura e pressão hidrostática
(Universidade Federal de São Carlos, 2008-08-22)
In this work were studied e®ects of cationic substitution, hydrostatic pressure and temperature on the phonon spectra of PLT samples, Pb1¡xLaxTiO3 (PLT), using Raman scattering technique. The samples having La concentration ...
Interação da matéria de vórtices com estruturas de defeitos em filmes de Nb
(Universidade Federal de São Carlos, 2009-03-30)
In this work we have studied the Vortex Matter dynamics in Nb superconducting films with different arrays of columnar defects. For that we studied the order-disorder line H (T) OD , where the melting of the vortex lattice ...
Estudos de avalanches de vórtices em filmes supercondutores de Nb e MgB2
(Universidade Federal de São Carlos, 2008-10-28)
If a type-II superconductor is cooled down in a zero applied field and subsequently an external field, larger than the first critical field, is applied, vortices enter through the sample borders until they are captured by ...