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Incoherent strange metal sharply bounded by the pseudogap critical doping in Bi2212

Invited

Abstract

In normal metals, macroscopic properties are understood using the concept of quasiparticles. In the cuprate high-temperature superconductors, the metallic state above the highest Tc is found to be very different and called the “strange metal”. In this talk, I will present a comprehensive angle-resolved photoemission study of its spectral function in Bi2212 [1]. With increasing doping across a temperature-independent critical value pc ~ 0.19, we observe a dramatic change near the Brillouin zone boundary where the strange metal characterized by incoherent spectral function abruptly reconstructs into a more conventional metal with quasiparticle-like excitations. Furthermore, above the temperature scale of superconducting fluctuations, we find that the pseudogap—the anomalous suppression of low-energy spectral intensity with decreasing temperature—also sharply collapses at the very same pc. These observations suggest that the incoherent strange metal is a prerequisite for the pseudogap and challenge presumptions associating the pseudogap with a quantum critical point.

[1] Chen, Hashimoto et al., Science 366, 1099 (2019)

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Presenters

  • Sudi Chen

    Stanford Univ

Authors

  • Sudi Chen

    Stanford Univ

  • Makoto Hashimoto

    SLAC - Natl Accelerator Lab, SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource, SLAC, Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, SLAC National Accelerator Laboratory,, SLAC National Accelerator Laboratory

  • Yu He

    Applied Physics, Yale University, Yale University, Physics, University of California, Berkeley, Stanford Univ

  • Dongjoon Song

    National Institute of Advanced Industrial Science and Technology

  • Kejun Xu

    Stanford Univ, Geballe Laboratory for Advanced Materials, Stanford University

  • Junfeng He

    Stanford Univ

  • Thomas Devereaux

    Stanford Univ, SLAC, Stanford, Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab, SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, SIMES, SLAC, SLAC

  • Hiroshi Eisaki

    National Institute of Advanced Industrial Science and Technology (AIST), National Institute of Advanced Industrial Science and Technology

  • Donghui Lu

    SLAC - Natl Accelerator Lab, SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource, SLAC, Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, SLAC National Accelerator Laboratory,, SLAC National Accelerator Laboratory

  • Jan Zaanen

    Leiden University, Leiden Institute of Physics, Leiden University

  • Zhixun Shen

    Stanford University, Stanford Univ, Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory