Origin for the enhanced copper spin echo decay rate in the pseudogap regime of the multilayer high-T_c cuprates

We report measurements of the anisotropy of the spin echo decay for the inner layer Cu site of the triple layer cuprate, Hg_0.8Re_0.2Ba_2Ca_2Cu_3O_8 (T_c=126 K) in the pseudogap T regime below T_pg ~ 170 K and the corresponding analysis for their interpretation. As the field alignment is varied, the shape of the decay curve changes from Gaussian (H_0 \parallel c) to single exponential (H_0 \perp c). The latter characterizes the decay caused by the fluctuations of adjacent Cu nuclear spins caused by their interactions with electron spins. The angular dependence of the second moment (T_{2M}^{-2} \equiv ) deduced from the decay curves indicates that T_{2M}^{-2} for H_0 \parallel c, which is identical to T_{2G}^{-2} (T_{2G} is the Gaussian component), is substantially enhanced, as seen in the pseudogap regime of the bilayer systems. Comparison of T_{2M}^{-2} between H_0 \parallel c and H_0 \perp c indicates that this enhancement is caused by electron spin correlations between the inner and the outer CuO_2 layers. These results provide the answer to the long-standing controversy regarding the opposite T dependences of (T_1T)^{-1} and T_{2G}^{-2} in the pseudogap regime of bi- and trilayer systems.Comment: 4 pages, 4 figure

Private state in public media : potential subjective elements in french-speaking (online) news

Digital media have come to constitute an inherent part of the nowadays mass media universe. In the context of the Web 2.0, legacy journalism has to face competing products which become more and more important in the public news reception. This thesis presents an investigation of the language use in legacy news and digital media, elucidating the pivotal question whether the expression of private state is similar (or not) in traditional and participatory media, and in different types of participatory media, i.e. citizen press and network journalism. Every news medium is linked to a given image or association, established by stereotypes of its journalists, the readership, and a particular news style. Therefore, it was assumed that private states are expressed differently in the three media, and that authorial presence and evaluative language use distinguish media from one another. Following a discourse analytic research angle by means of a corpus linguistic approach, including quantitative and qualitative sample analyses, the study investigated different types of potential subjective elements, i.e., linguistic means which can be used to express private states in a rather implicit, objective seeming way.(LALE - Langues et lettres) -- UCL, 201