期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 113, 期 48, 页码 13654-13659出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1602709113
关键词
high T-c superconductivity; electrical transport; Fermi liquid; Fermi surface
资金
- project SUPERFIELD of the French Agence Nationale de la Recherche
- Laboratory of Excellence Nano, Extreme Measurements and Theory in Toulouse
- High Field Magnet Laboratory-Radboud University/Fundamental Research on Matter
- Laboratoire National des Champs Magnetiques Intenses
Our knowledge of the ground state of underdoped hole-doped cuprates has evolved considerably over the last few years. There is now compelling evidence that, inside the pseudogap phase, charge order breaks translational symmetry leading to a reconstructed Fermi surface made of small pockets. Quantum oscillations [DoironLeyraud N, et al. (2007) Nature 447(7144):565-568], optical conductivity [Mirzaei SI, et al. (2013) Proc Natl Acad Sci USA 110(15):57745778], and the validity of Wiedemann-Franz law [Grissonnache G, et al. (2016) Phys Rev B 93:064513] point to a Fermi liquid regime at low temperature in the underdoped regime. However, the observation of a quadratic temperature dependence in the electrical resistivity at low temperatures, the hallmark of a Fermi liquid regime, is still missing. Here, we report magnetoresistance measurements in the magnetic-field-induced normal state of underdoped YBa2Cu4O8 that are consistent with a T-2 resistivity extending down to 1.5 K. The magnitude of the T-2 coefficient, however, is much smaller than expected for a single pocket of the mass and size observed in quantum oscillations, implying that the reconstructed Fermi surface must consist of at least one additional pocket.
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