Evolution of the quasiparticle spectral function in cuprates
S. Misra(1), R. Gatt(1), T. Schmauder(1), Andrey V. Chubukov(1), M., Onellion(1), M. Zacchigna(2), I. Vobornik(2), F. Zwick(2), M. Grioni(2), G., Margaritondo(2), C. Quitmann(3), C. Kendziora(4) ((1) University of, Wisconsin- Madison, (2) Ecole Polytechnique Federale Lausanne
TL;DR
This paper investigates how the quasiparticle spectral function in cuprates evolves with doping, revealing a transition from Fermi liquid to non-Fermi liquid behavior and fitting the data to a model involving strong spin fluctuations.
Contribution
It provides a detailed analysis of photoemission data across doping levels, highlighting the change in spectral behavior and proposing a theoretical fit for the non-Fermi liquid regime.
Findings
Fermi liquid behavior in overdoped cuprates
Non-Fermi liquid behavior in underdoped cuprates
Spectral data fits a 1/√ω model for strong spin fluctuations
Abstract
We analyzed photoemssion data for several doping levels of the Bi_2Sr_2CaCu_2O_{8+x} compounds, ranging from overdoped to underdoped. We show that the high frequency part of the spectra near (0,\pi) can be described by Fermi liquid theory in the overdoped regime, but exhibits a non-Fermi liquid behavior in the underdoped regime. We further demonstrate that this novel behavior fits reasonably well to a 1/\sqrt{\omega} behavior suggested for systems with strong spin fluctuations.
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