A. Koitzsch

(pi-pi) electronic order in iron arsenide superconductors

The distribution of valence electrons in metals usually follows the symmetry of the underlying ionic lattice. Modulations of this distribution often occur when those electrons are not stable with respect to a new electronic order, such as spin or charge density waves. Electron density waves have been observed in many families of superconductors, and are often considered to be essential for superconductivity to exist. Recent measurements seem to show that the properties of the iron pnictides are in good agreement with band structure calculations that do not include additional ordering, implying no relation between density waves and superconductivity in these materials. Here we report that the electronic structure of Ba1-xKxFe2As2 is in sharp disagreement with those band structure calculations, and instead reveals a reconstruction characterized by a (π, π) wavevector. This electronic order coexists with superconductivity and persists up to room temperature (300 K).

Anomalous Enhancement of the Coupling to the Magnetic Resonance Mode in Underdoped Pb-Bi2212

High-resolution angle-resolved photoemission with variable excitation energies is used to disentangle bilayer splitting effects and intrinsic (self-energy) effects in the electronic spectral function near the (

Momentum dependence of the superconducting gap in Ba 1 − x K x Fe 2 As 2

\pi

Doping dependence of the mass enhancement in (Pb, Bi)2Sr2CaCu2O8 at the antinodal point in the superconducting and normal states

,0)-point of differently doped (Pb,Bi)

Kinks, nodal bilayer splitting, and interband scattering in YBa2Cu3O6+x

_2

Bare electron dispersion from experiment: Self-consistent self-energy analysis of photoemission data

Sr

Relation between the one-particle spectral function and dynamic spin susceptibility of superconducting Bi2Sr2CaCu2O8-δ

_2

Momentum dependence of the superconducting gap in Ba1-xKxFe2As2

CaCu

Evidence for CuO conducting band splitting in the nodal direction of Bi2Sr2CaCu2O8+d

_2

Disentangling surface and bulk photoemission using circularly polarized light

O