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Title: Revealing the Coulomb interaction strength in a cuprate superconductor

Abstract

Here, we study optimally doped Bi 2 Sr 2 Ca 0.92 Y 0.08 Cu 2 O 8 + δ (Bi2212) using angle-resolved two-photon photoemission spectroscopy. Three spectral features are resolved near 1.5, 2.7, and 3.6 eV above the Fermi level. By tuning the photon energy, we determine that the 2.7-eV feature arises predominantly from unoccupied states. The 1.5- and 3.6-eV features reflect unoccupied states whose spectral intensities are strongly modulated by the corresponding occupied states. These unoccupied states are thus consistent with the prediction from a cluster perturbation theory based on the single-band Hubbard model. Through this comparison, a Coulomb interaction strength U of 2.7 eV is extracted. Our study complements equilibrium photoemission spectroscopy and provides a direct spectroscopic measurement of the unoccupied states in cuprates. The determined Coulomb U indicates that the charge-transfer gap of optimally doped Bi2212 is 1.1 eV.

Authors:
 [1];  [2];  [1];  [1];  [1];  [3];  [4];  [4];  [5];  [3];  [3];  [3];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences; Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials, Dept. of Physics and Applied Physics
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
  5. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan). Electronics and Photonics Research Inst.
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Swiss National Science Foundation (SNSF)
OSTI Identifier:
1417290
Grant/Contract Number:
AC02-76SF00515; P300P2151328
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 24; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Yang, S. -L., Sobota, J. A., He, Y., Wang, Y., Leuenberger, D., Soifer, H., Hashimoto, M., Lu, D. H., Eisaki, H., Moritz, B., Devereaux, T. P., Kirchmann, P. S., and Shen, Z. -X. Revealing the Coulomb interaction strength in a cuprate superconductor. United States: N. p., 2017. Web. doi:10.1103/physrevb.96.245112.
Yang, S. -L., Sobota, J. A., He, Y., Wang, Y., Leuenberger, D., Soifer, H., Hashimoto, M., Lu, D. H., Eisaki, H., Moritz, B., Devereaux, T. P., Kirchmann, P. S., & Shen, Z. -X. Revealing the Coulomb interaction strength in a cuprate superconductor. United States. doi:10.1103/physrevb.96.245112.
Yang, S. -L., Sobota, J. A., He, Y., Wang, Y., Leuenberger, D., Soifer, H., Hashimoto, M., Lu, D. H., Eisaki, H., Moritz, B., Devereaux, T. P., Kirchmann, P. S., and Shen, Z. -X. Fri . "Revealing the Coulomb interaction strength in a cuprate superconductor". United States. doi:10.1103/physrevb.96.245112.
@article{osti_1417290,
title = {Revealing the Coulomb interaction strength in a cuprate superconductor},
author = {Yang, S. -L. and Sobota, J. A. and He, Y. and Wang, Y. and Leuenberger, D. and Soifer, H. and Hashimoto, M. and Lu, D. H. and Eisaki, H. and Moritz, B. and Devereaux, T. P. and Kirchmann, P. S. and Shen, Z. -X.},
abstractNote = {Here, we study optimally doped Bi 2 Sr 2 Ca 0.92 Y 0.08 Cu 2 O 8 + δ (Bi2212) using angle-resolved two-photon photoemission spectroscopy. Three spectral features are resolved near 1.5, 2.7, and 3.6 eV above the Fermi level. By tuning the photon energy, we determine that the 2.7-eV feature arises predominantly from unoccupied states. The 1.5- and 3.6-eV features reflect unoccupied states whose spectral intensities are strongly modulated by the corresponding occupied states. These unoccupied states are thus consistent with the prediction from a cluster perturbation theory based on the single-band Hubbard model. Through this comparison, a Coulomb interaction strength U of 2.7 eV is extracted. Our study complements equilibrium photoemission spectroscopy and provides a direct spectroscopic measurement of the unoccupied states in cuprates. The determined Coulomb U indicates that the charge-transfer gap of optimally doped Bi2212 is 1.1 eV.},
doi = {10.1103/physrevb.96.245112},
journal = {Physical Review B},
number = 24,
volume = 96,
place = {United States},
year = {Fri Dec 08 00:00:00 EST 2017},
month = {Fri Dec 08 00:00:00 EST 2017}
}

Journal Article:
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