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Abstract Understanding high-temperature superconductivity in cuprates requires knowledge of the metallic phase it evolves from, particularly the pseudogap profoundly affecting the electronic properties at low carrier densities. A key question is the influence of chemical disorder, which is ubiquitous but exceedingly difficult to model. Using resonant X-ray scattering, we identified two-dimensional charge order in stoichiometric YBa2Cu4O8 (Tc = 80 K), which is nearly free of chemical disorder.
Abstract With the breakdown of coherent Kondo scattering with rising temperature, the Fermi surface (FS) in rare-earth Kondo lattices is expected to transition from the large FS counting the 4f moments, which form entangled quasiparticles with strongly enhanced effective masses with the conduction states, to the small FS with decoupled and localized 4f moments.
Within the usually used approximations the Kondo model predicts that both the low temperature valence, 3 − Δn (0), and the temperature scale, T , on which the valence changes occur will increase with increasing Kondo scale T (see e.g. ref. 30, n.b. Supplementary Note 5). Figure 4b clearly shows that there is indeed a very nice correlation between Δn (0) measured with RXES and the thermodynamically determined T .
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