Ubiquitous suppression of the nodal coherent spectral weight in Bi-based cuprates

Abstract

High-temperature superconducting cuprates exhibit an intriguing phenomenology for the low-energy elementary excitations. In particular, an unconventional temperature dependence of the coherent spectral weight (CSW) has been observed in the superconducting phase by angle-resolved photoemission spectroscopy (ARPES), both at the antinode where the d-wave paring gap is maximum, as well as along the gapless nodal direction. Here, we combine equilibrium and time-resolved ARPES to track the temperature-dependent meltdown of the nodal CSW in Bi-based cuprates with unprecedented sensitivity. We find the nodal suppression of CSW upon increasing temperature to be ubiquitous across single-and bi-layer Bi cuprates, and uncorrelated to superconducting and pseudogap onset temperatures. We quantitatively model both the lineshape of the nodal spectral features and the anomalous suppression of CSW within the Fermi-liquid framework, establishing the key role played by the normal state electrodynamics in the description of nodal quasiparticles in superconducting cuprates.

Fate of Quasiparticles at High Temperature in the Correlated Metal Sr2RuO4

“…Hund metals with an orbital selective Mott phase, as proposed by Yi et al for certain iron chalcogenides [15], may show QP weights → 0 for orbitals that localize, while the weights of orbitals contributing to high temperature transport may well show the behavior uncovered here for Sr 2 RuO 4 . An important issue for future experimental work will be to investigate QP residues in Mott systems such as VO 2 and V 2 O 3 or doped iridates and cuprates [57,58].…”