Speaker
Prof.
Kim Lefmann
(University of Copenhagen)
Description
We present detailed neutron scattering studies of the static and dynamic stripes in an optimally doped high-temperature superconductor, La$_2$CuO$_{4+y}$.
We find that the dynamic stripes do not disperse towards the static stripes in the limit of vanishing energy transfer. We conclude that the dynamic stripes observed in neutron scattering experiments are not the Goldstone modes associated with the broken symmetry of the simultaneously observed static stripes, but rather that the signals originate from different domains in the sample. These domains may be related by structural twinning, or may be entirely different phases, where the static stripes in one phase are pinned versions of the dynamic stripes in the other.
Our findings are relevant for all compounds exhibiting magnetic stripes, and may thus be a vital part in unveiling the nature of high temperature superconductivity.
Primary author
Mr
Henrik Jacobsen
(Niels Bohr Institute)
Co-authors
Prof.
Barrett Wells
(Dept. Phys. Univ. Connecticut)
Dr
Jean-Claude Grivel
(Dept. Energy, Technical Univ. Denmark)
Prof.
Kim Lefmann
(University of Copenhagen)
Dr
Linda Udby
(Niels Bohr Institute)
Mr
Mads Bertelsen
(University of Copenhagen)
Dr
Martin Böhm
(ILL, Grenoble)
Ms
Monica-Elisabeta Lacatusu
(Dept. Energy, Technical Univ. Denmark)
Dr
Rasmus Toft-Petersen
(Technical University of Denmark)
Dr
Samuel Emery
(Dept. Physics, Univ. Connecticut)
Mrs
Sonja Holm
(Niels Bohr Institute, University of Copenhagen)
