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Relaxation and dynamical properties of water in partially filled porous materials using NMR techniques
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Evidence of unconventional low-frequency dynamics in the normal phase of Ba(Fe_{1−x}Rh_{x})_{2}As_{2} iron-based superconductors
No full textThis work presents 75As NMR spin-echo decay rate (1/T2) measurements in Ba(Fe1−xRhx )2As2 superconductors,
for 0.041 <x< 0.094. It is shown that 1/T2 increases upon cooling, in the normal phase, suggesting the
onset of an unconventional very low-frequency activated dynamic. The correlation times of the fluctuations and
their energy barriers are derived. The motion is favored at large Rh content, while it is hindered by the application
of a magnetic field perpendicular to the FeAs layers. The same dynamic is observed in the spin-lattice relaxation
rate, in a quantitatively consistent manner. These results are discussed in the light of nematic fluctuations involving
domain wall motion. The analogies with the behavior observed in the cuprates are also outlined
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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