Spectroscopic evidence for Fermi liquid-like energy and temperature dependence of the relaxation rate in the pseudogap phase of the cuprates

Seyed Iman Mirzaei, Damien Stricker, Jason N. Hancock, Christophe Berthod, Antoine Georges, Erik Van Heumen, Mun K. Chan, Xudong Zhao, Yuan Li, Martin Greven, Neven Barisic, Dirk Van Der Marel

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

Abstract

Cuprate high-Tc superconductors exhibit enigmatic behavior in the nonsuperconducting state. For carrier concentrations near "optimal doping" (with respect to the highest Tcs) the transport and spectroscopic properties are unlike those of a Landau-Fermi liquid. On the Mott-insulating side of the optimal carrier concentration, which corresponds to underdoping, a pseudogap removes quasiparticle spectral weight from parts of the Fermi surface and causes a breakup of the Fermi surface into disconnected nodal and antinodal sectors. Here, we show that the near-nodal excitations of underdoped cuprates obey Fermi liquid behavior. The lifetime τ(ω, T) of a quasi-particle depends on its energy ω as well as on the temperature T. For a Fermi liquid, 1/τ(ω, T) is expected to collapse on a universal function proportional to (hω)2 + (pπk BT)2. Magnetotransport experiments, which probe the properties in the limit ω = 0, have provided indications for the presence of a T2 dependence of the dc (ω = 0) resistivity of different cuprate materials. However, Fermi liquid behavior is very much about the energy dependence of the lifetime, and this can only be addressed by spectroscopic techniques. Our optical experiments confirm the aforementioned universal ω- and T dependence of 1/τ(ω, T), with p ∼ 1.5. Our data thus provide a piece of evidence in favor of a Fermi liquid-like scenario of the pseudogap phase of the cuprates.

Original languageEnglish (US)
Pages (from-to)5774-5778
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume110
Issue number15
DOIs
StatePublished - Apr 9 2013

Bibliographical note

Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.

Keywords

  • Mass renormalization
  • Optical spectroscopy
  • Self energy
  • Superconductivity

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