News Finding: If the finding holds up, it would sever any connection between ordinary superconductors, such as lead and niobium, and the high-temperature materials.
Paper Finding: The independent variation of T e,b is expected to induce different modifications of the dielectric function.
News Context: If the finding holds up, it would sever any connection between ordinary superconductors, such as lead and niobium, and the high-temperature materials. At low temperatures, there isn't enough energy around to do that, so the pairs glide through unimpeded. The team was also able to trace the reaction not only in time, but also as a function of the frequency of the reflected light.
Paper Context: where Ψ is the Digamma function obtained by integrating the Fermi-Dirac functions and N (Ω, T b ) the Bose distribution at temperature T b , can be decomposed into different terms depending on the electronic (T e ) and bosonic (T b ) temperatures. The independent variation of T e,b is expected to induce different modifications of the dielectric function. Figure 1 shows the expected relative variation of the reflectivity, i.e., δR/R (ω, T )= [R (ω, T + δT )-R (ω, T )]/R (ω, T ), in the quasi-thermal (δT e =δT b >0) and non-thermal (δT e >0, δT b =0) scenarios.