期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 110, 期 15, 页码 5774-5778出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1218846110
关键词
optical spectroscopy; superconductivity; mass renormalization; self energy
资金
- Swiss National Science Foundation (SNSF) [200020-140761]
- National Center of Competence in Research
- Materials with Novel Electronic Properties
- US Department of Energy, Office of Basic Energy Sciences
- National Natural Science Foundation, China
- European Commission under the [Intra-European Fellowships (IEF)]
- Vernieuwingsimpuls (VENI)
- Netherlands Organisation for Scientific Research
- Swiss National Science Foundation (SNF) [200020_140761] Funding Source: Swiss National Science Foundation (SNF)
Cuprate high-T-c superconductors exhibit enigmatic behavior in the nonsuperconducting state. For carrier concentrations near optimal doping (with respect to the highest T(c)s) 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 quasi-particle 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 tau(omega,T) of a quasi-particle depends on its energy co as well as on the temperature T. For a Fermi liquid, 1/tau(omega,T) is expected to collapse on a universal function proportional to (h omega)(2) + (p pi k(B)T)(2). Magneto-transport experiments, which probe the properties in the limit co = 0, have provided indications for the presence of a T-2 dependence of the dc (omega = 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 co-and T dependence of 1/tau(omega,T), with p similar to 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.
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