Short range matters: understanding the persistence of spin excitation in doped cuprates

Date

Apr 3, 2023

Time

11:00 AM - 12:00 PM

Speaker

Cliò Agrapidis

Affiliation

University of Warsaw

Language

en

Main Topic

Materialien

Host

Grit Rötzer

Description

The nature of the spin excitations in superconducting cuprates is a key question toward a unified understanding of the cuprate physics from long-range antiferromagnetism to superconductivity. The intense spin excitations up to the over-doped regime revealed by resonant inelastic X-ray scattering bring new insights as well as questions like how to understand their persistence or their relation to the collective excitations in ordered magnets (magnons). Here, we study the evolution of the spin excitations upon hole-doping the superconducting cuprate Bi2Sr2CaCu2O8+d by disentangling the spin from the charge excitations in the experimental cross section. We compare our experimental results against density matrix renormalization group calculations for a t-J-like model on a square lattice. Our results unambiguously confirm the persistence of the spin excitations, which are closely connected to the persistence of short-range magnetic correlations up to high doping. This suggests that the spin excitations in hole-doped cuprates are related to magnons—albeit short-ranged. .

Links

• Seminars at the IFW

Last modified: Apr 3, 2023, 7:37:59 AM