Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 81: Superconductivity: Properties and Electronic Structure
TT 81.6: Vortrag
Donnerstag, 3. April 2014, 10:45–11:00, HSZ 201
Spin excitations of ferronematic order in underdoped cuprate superconductors — •Götz Seibold1, Carlo Di Castro2, Marco Grilli2, and Jose Lorenzana2 — 1BTU Cottbus-Senftenberg, Germany — 2University of Rome 'La Sapienza', Italy
The presence of an anisotropic hourglass shaped spectrum for magnetic excitations in underdoped cuprates is explained by a model in which topological defects of the antiferromagnet clump to producing domain wall segments with ferronematic order. This state does not invoke global charge order but breaks C4 rotational and inversion symmetry. The incommensurability of the low doping charge-disordered state is in good agreement with experiment and interpolates smoothly with the incommensurability of the stripe phase at higher doping. Within linear spin-wave theory the dynamic structure factor is in very good agreement with inelastic neutron scattering data and can account for the energy dependent anisotropy observed.