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O: Fachverband Oberflächenphysik
O 93: Electronic structure of surfaces: Spectroscopy, surface states III
O 93.5: Vortrag
Freitag, 13. März 2026, 10:30–10:45, HSZ/0201
Imaging stripe dynamics in superconducting nickelate — •Uladzislau Mikhailau1, Luke C. Rhodes1, Matthias Hepting2, Masahiko Isobe2, Pascal Puphal2, and Peter Wahl1,3 — 1University of St Andrews, St Andrews, United Kingdom — 2Max-Planck-Institute for Solid State Research, Stuttgart, Germany — 3Physikalisches Institut, Universitat Bonn, Germany
In the Hubbard model, there is a competition between charge localization due to Coulomb repulsion and delocalization due to the energy reduction from electrons hopping between sites. When both tendencies are equally strong, a unique correlated stripe order can be stabilized [1]. Such a state is known to be realized in lightly doped high temperature superconducting cuprates and in nickelates.
Our STM investigation shows that commensurate stripe order forms in the metallic state of the recently discovered high-temperature superconductor La4Ni3O10. Quasi-1D channels of delocalized charge appear as solitonic domain walls in charge density probed by STM. Interestingly, electrons tunnelling from the tip can induce local stripe fluctuations, pointing at the weak pinning of the order to the lattice.
Observation of stripe orders in normal states of high temperature cuprates and nickelates suggests shared correlated physics as a precursor to high-temperature superconductivity in both systems. Such experimental evidence is a valuable foundation for investigations into the mechanism of high-temperature superconductivity in both systems.
[1] J. Zaanen and O. Gunnarsson. Phys. Rev. B, 40(10):7391-7394 (1989).
Keywords: Scanning Tunnelling Microscopy; Correlated electron physics; Stripes; Nickelate; Stripe fluctuations