Spectroscopic fingerprint of charge order melting driven by quantum fluctuations in a cuprate

Lee, Wei-Sheng; Zhou, Ke-Jin; Hepting, M.; Li, J.; Nag, A.; Walters, A. C.; Garcia-Fernandez, M.; Robarts, H. C.; Hashimoto, M.; Lu, H.; Nosarzewski, B.; Song, D.; Eisaki, H.; Shen, Z. X.; Moritz, B.; Zaanen, J.; Devereaux, T. P.

doi:10.1038/s41567-020-0993-7

Spectroscopic fingerprint of charge order melting driven by quantum fluctuations in a cuprate

Journal Article · Mon Aug 31 04:00:00 EDT 2020 · Nature Physics

DOI:https://doi.org/10.1038/s41567-020-0993-7· OSTI ID:1633896

^[1]; ^[2]; ^[3]; Li, J. ^[2]; Nag, A. ^[2]; Walters, A. C. ^[2]; Garcia-Fernandez, M. ^[2]; Robarts, H. C. ^[2]; Hashimoto, M. ^[4]; Lu, H. ^[5]; Nosarzewski, B. ^[5]; Song, D. ^[6]; Eisaki, H. ^[6]; ^[7]; ^[3]; Zaanen, J. ^[8]; ^[7]

SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); SLAC/Stanford University
Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Stanford Univ., CA (United States)
National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
Leiden Univ. (Netherlands). Inst.-Lorentz for Theoretical Physics

Copper oxide high-T_C superconductors possess a number of exotic orders that coexist with or are proximal to superconductivity. Quantum fluctuations associated with these orders may account for the unusual characteristics of the normal state, and possibly affect the superconductivity. Yet, spectroscopic evidence for such quantum fluctuations remains elusive. Here in this paper, we use resonant inelastic X-ray scattering to reveal spectroscopic evidence of fluctuations associated with a charge order in nearly optimally doped Bi₂Sr₂CaCu₂O_8+δ. In the superconducting state, while the quasielastic charge order signal decreases with temperature, the interplay between charge order fluctuations and bond-stretching phonons in the form of a Fano-like interference increases, an observation that is incompatible with expectations for competing orders. Invoking general principles, we argue that this behaviour reflects the properties of a dissipative system near an order–disorder quantum critical point, where the dissipation varies with the opening of the pseudogap and superconducting gap at low temperatures, leading to the proliferation of quantum critical fluctuations, which melt charge order.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1633896

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 1 Vol. 17; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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