3,153 research outputs found
Effect of chemical substitution in Rh17S15
Rh17S15 has recently been shown to be a strongly correlated superconductor
with a transition temperature of 5.4 K. In order to understand the nature of
strong correlations we study the effect of substitution of some of the Rh and S
atoms by other elements such as Fe, Pd, Ir and Ni on the Rh side and Se on the
S side in this work. We find that while substitution of Ir and Se lower the
transition temperature considerably, that of Fe, Pd and Ni destroy
superconductivity down to 1.5 K. The resistivity data in these doped samples
show a minimum which is presumably disorder induced. A reduction of Tc is
always accompanied by a reduction of electron correlations as deduced from heat
capacity and magnetization data. Interestingly, the Fe doped sample shows some
possible antiferromagnetic ordering at low temperatures.Comment: Published in Journal of Physics Condensed Matte
To mesh or not to mesh: flexible wireless indoor communication among mobile robots in industrial environments
Mobile robots such as automated guided vehicles become increasingly important in industry as they can greatly increase efficiency. For their operation such robots must rely on wireless communication, typically realized by connecting them to an existing enterprise network. In this paper we motivate that such an approach is not always economically viable or might result in performance issues. Therefore we propose a flexible and configurable mixed architecture that leverages on mesh capabilities whenever appropriate. Through experiments on a wireless testbed for a variety of scenarios, we analyse the impact of roaming, mobility and traffic separation and demonstrate the potential of our approach
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