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