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TT: Fachverband Tiefe Temperaturen
TT 68: Superconductivity: Properties and Electronic Structure
TT 68.5: Talk
Thursday, March 21, 2024, 10:30–10:45, H 3010
Unusual Low-Energy Collective Charge Excitations in High-Tc Cuprate Superconductors — Vyacheslav Silkin1, Stefan-Ludwig Drechsler2, and •Dmitri Efremov2 — 1Donostia International Physics Center (DIPC), 20018 San Sebastiian/Donostia, Basque Country, Spain Departamento de Polimeros y Materiales Avanzados: Fisica, Quimica y Tecnologia, Facultad de Ciencias Quimicas, Universidad del Pais Vasco UPV/EHU, 20080 San Sebastiian/Donostia, Basque Country, Spain and IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Basque Country, Spain — 2Leibniz Institute for Solid State and Materials Research IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany
Here, we present our study investigating the low-energy charge excitations in the normal state of HTSC cuprates. Our findings demonstrate that the unique characteristics of the electronic band structure at low energies significantly influence the nature of the intraband collective modes. This effect leads to the emergence of a novel type of mode with exceptionally high intensity. The study presents a non-Lorentzian spectral function, incorporated with popular collective excitations such as conventional plasmons and spin fluctuation. The nodal and antinodal directions reveal the presence of two distinct modes exhibiting maximal spectral weight. Moreover, an antinodal direction presents the intensity of a quasi-one-dimensional plasmon, which gradually transforms into a prolonged, soft mode over an extensive momentum range.
Keywords: HTSC; plasmons