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)

*This work is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under contract DE-AC02-76SF00515.

–

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