We report a systematic investigation of the local electronic, magnetic, and superconducting properties of the new iron-based high temperature superconductor Ba(Fe(1-x)Co(x)As(2) (x = 0, 0.02 , 0.04, 0.082) through the measurement of 75As and 59Co NMR (Nuclear Magnetic Resonance) lineshapes, Knight shift (K), and spinlattice relaxation rate ( 1/ T1) . The 75As NMR lineshape of the undoped parent compound splits into two sets due to discrete values of hyperfine magnetic field B(c)(hf)= ±1.32 Tesla below the magnetic ordering temperature to the SDW (Spin Density Wave) state, TSDW. In contrast, for lightly Co doped samples with x=0.02 and 0.04, the 75As and 59Co lineshapes become broad and featureless below Tsnw , indicating that the ground state is no longer the commensurate SDW ordered state. The observed lineshape is consistent with an incommensurate SDW ordered state, or a commensurate state with large distribution of hyperfine field Bhf. In the optimally doped superconductor with x = 0.082 (Tc = 22 K) , we observe two types of As sites and three types of Co sites, respectively, as expected from a binomial distribution of Co dopants. We found no evidence for induced localized moments in the vicinity of Co dopants. This finding is in remarkable contrast with the case of Zn or Ni doped high Tc cuprates, and suggests that the fundamental physics of iron-based superconductors is different from that of cu prates. The temperature dependences of 75,59K and 75,59 (1/T1T) at both 75As and 59Co sites show that Ba(Fe(1-x)Co(x))(2)As(2) exhibits spin pseudo-gap like behavior down to ~100 K for a broad Co concentration range. Below ~100 K , we observe the enhancement of residual antiferromagnetic spin fluctuations associated with inter-band spin excitations between the hole and electron Fermi surfaces even for x= 0.082. This effect is suppressed in the overdoped sample with x= 0.099, and Tc decreases. Therefore, we suggest that antiferromagnetic spin fluctuations play a crucial role in the superconducting mechanism of Ba(Fe(1-x)Co(x))(2)As(2) . We also demonstrate that the superconductivity arises from a novel electronic state with spin susceptibility Xs ~ constant and in-plane resistivity P(ab)~T, which is not consistent with canonical Fermi-liquid behavior. / Thesis / Doctor of Philosophy (PhD)

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[pt] Esta dissertação pretende desenvolver uma análise teológica sobre o papel da música sacra no cenário atual de evangelização no Brasil: elementos para o entendimento do estado da questão. Inicialmente, fizemos um percurso em busca do conceito de música sacra e sua importância para a vida humana em Israel, nas primeiras comunidades cristãs, para mostrar seu papel essencial para a manifestação da fé. A seguir, focamos no esforço de projetar uma perspectiva antropológica em relação à música sacra que contribuísse para sua participação harmônica na integração social de pessoas, grupos, comunidades. É inegável, então, que a Igreja desde a sua fundação canta e celebra o amor de Deus. Assim sendo, o Concílio Vaticano II contribuiu para a efetiva participação das pessoas nas celebrações e para o surgimento na realidade brasileira de uma gama, até difícil de ser documentada, de cantos, de músicos, de músicas. Entretanto, diante das exigências da atualidade, podemos inferir que a música ao ser inserida em uma determinada cultura se apropria de elementos que são parte integrante dela. Por conseguinte, evidenciamos a importância da música como um instrumento de evangelização no Brasil. / [en] This dissertation intends to carry out a theological analysis about the role of sacred music in today’s evangelism scenario in Brazil: elements to understand the state of the art. First, we set out on a journey in search of the concept of sacred music and its importance in human life, in Israel, in the first Cristian communities, in order to show that this type of music is an essential element for people to proclaim their faith in worship. Then we focused on the effort to project an anthropological perspective towards sacred music that would contribute to the realization of its harmonic participation in the social integration of people, groups and communities. We also pointed out that the Second Vatican Council contributed to the effective participation of people in the celebrations and to the appearance of a great number of songs and musicians. However, faced by today s demands, we must acknowledge that music when introduced into a certain culture takes over elements that are an integral part of that culture. Therefore, we have been able to present the importance of music as an instrument of evangelism in Brazil.

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