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MM: Fachverband Metall- und Materialphysik
MM 32: Transport in Materials: Diffusion, Charge or Heat Conduction
MM 32.10: Vortrag
Donnerstag, 20. März 2025, 17:30–17:45, H22
Contribution of damped collective modes to thermopower in the strange metal phase of cuprates — •Giovanni Mirarchi1, Sergio Caprara2,3, Carlo Di Castro2, Götz Seibold4, and Marco Grilli2,3 — 1Institute of Theoretical Physics and Astrophysics, University of Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Dipartimento di Fisica, Sapienza Università di Roma, P. le Aldo Moro 5, 00185 Roma, Italy — 3ISC-CNR, Unità di Roma Sapienza, P. le Aldo Moro 5, 00185 Roma, Italy — 4Institut für Physik, BTU Cottbus-Senftenberg - PBox 101344, D-03013 Cottbus, Germany
The strange-metal behavior, which is still an unsolved problem in condensed matter physics, is typically signaled by anomalies in thermodynamic and transport properties, including the famous linear-in-temperature resistivity [1]. The best-known case of strange-metal behavior in literature is that of high-temperature superconducting cuprates, whose strange-metal phase seems to always be accompanied by some kind of dynamical charge order [2]. Based on the experimental evidence of damped short-ranged charge density collective modes in the strange-metal phase of cuprates [3], we propose a scenario in which these collective modes can affect the phenomenology of this phase by interacting with electrons and by directly contributing to thermodynamics and transport [4]. In this talk, the concept of heat current in the presence of damping is discussed and used to describe the Seebeck effect in cuprates through a mechanism analogous to phonon drag. [1] Nat. Phys. 15, 142-147 (2019). [2] Science 337, 821 (2012). [3] Science 365, 906-910 (2019). [4] Commun. Phys. 5, 10 (2022).
Keywords: High-temperature superconducting cuprates; Strange-metal phase; Charge density fluctuations; Seebeck effect; Heat current