Direct evidence for a magnetic f-electron–mediated pairing mechanism of heavy-fermion superconductivity in CeCoIn5
Proceedings of the National Academy of Sciences of the United States of America Proceedings of the National Academy of Sciences 111:32 (2014) 11663-11667
Direct phase-sensitive identification of a d-form factor density wave in underdoped cuprates
Proceedings of the National Academy of Sciences of the United States of America Proceedings of the National Academy of Sciences 111:30 (2014) e3026-e3032
Simultaneous transitions in cuprate momentum-space topology and electronic symmetry breaking
Science 344:6184 (2014) 612-616
Abstract:
The existence of electronic symmetry breaking in the underdoped cuprates and its disappearance with increased hole density p are now widely reported. However, the relation between this transition and the momentum-space (k →-space) electronic structure underpinning the superconductivity has not yet been established. Here, we visualize the Q→ = 0 (intra-unit-cell) and Q→ ≠0 (density-wave) broken-symmetry states, simultaneously with the coherent k→-space topology, for Bi2Sr2CaCu2O8+δ samples spanning the phase diagram 0.06 ≤ p ≤ 0.23. We show that the electronic symmetry-breaking tendencies weaken with increasing p and disappear close to a critical doping pc = 0.19. Concomitantly, the coherent k →-space topology undergoes an abrupt transition, from arcs to closed contours, at the same pc. These data reveal that the k →-space topology transformation in cuprates is linked intimately with the disappearance of the electronic symmetry breaking at a concealed critical point.Enigmatic nematic
Nature Physics Springer Nature 10:3 (2014) 184-185
Concepts relating magnetic interactions, intertwined electronic orders, and strongly correlated superconductivity
Proceedings of the National Academy of Sciences of the United States of America Proceedings of the National Academy of Sciences 110:44 (2013) 17623-17630