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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America. >Fermi liquid behavior of the in-plane resistivity in the pseudogap state of YBa2Cu4O8
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Fermi liquid behavior of the in-plane resistivity in the pseudogap state of YBa2Cu4O8

机译：Fermi liquid behavior of the in-plane resistivity in the pseudogap state of YBa2Cu4O8

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摘要

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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