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Incoherent Strange Metal Sharply Bounded by a Critical Doping in Bi2212

ORAL

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”. To study this state, we use angle-resolved photoemission spectroscopy to directly measure its spectral function. 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. This sharp reconstruction signals the incoherent strange metal as a distinct state of matter. 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. This suggests that the pseudogap is a low-temperature phenomenon associated with the incoherent strange metal.

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Presenters

  • Su-Di Chen

    Stanford University, Applied Physics, Stanford University, SLAC National Accelerator Laboratory, Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford Univ

Authors

  • Su-Di Chen

    Stanford University, Applied Physics, Stanford University, SLAC National Accelerator Laboratory, Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford Univ

  • Makoto Hashimoto

    SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource, Stanford Synchrotron Radiation Lightsource, SSRL, SLAC National Laboratory, SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory

  • Yu He

    Stanford Univ

  • Dongjoon Song

    National Institute of Advanced Industrial Science and Technology, Japan

  • Kejun Xu

    Stanford University, Geballe Laboratory for Advanced Materials, Stanford University, Stanford Univ

  • Junfeng He

    Stanford Univ

  • Thomas Devereaux

    Stanford Univ, Materials Science and Engineering, Stanford University, Stanford University, SLAC National Accelerator Laboratory, Photon Sciences, Stanford Linear Accelerator (SLAC), SIMES, SLAC, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA, SLAC National Accelerator Lab.

  • Hiroshi Eisaki

    AIST, Japan, National Institute of Advanced Industrial Science and Technology, The National Institute of Advanced Industrial Science and Technology, National Institute of Advanced Industrial Science and Technology, Japan

  • Donghui Lu

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

  • Jan Zaanen

    Leiden University, Leiden Institute of Physics, Leiden University, Leiden University, the Netherlands

  • Zhixun Shen

    Standford, Stanford University, Stanford Univeristy, Applied Physics, Stanford University, SLAC National Accelerator Laboratory, Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, SIMES, SLAC - Natl Accelerator Lab, Stanford Univ