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Title: Spectroscopic Evidence for Electron-Boson Coupling in Electron-Doped Sr 2 IrO 4

Abstract

The pseudogap, d-wave superconductivity and electron-boson coupling are three intertwined key ingredients in the phase diagram of the cuprates. Sr2IrO4 is a 5d-electron counterpart of the cuprates in which both the pseudogap and a d-wave instability have been observed. Here, we report spectroscopic evidence for the presence of the third key player in electron-doped Sr2IrO4: electron-boson coupling. A kink in nodal dispersion is observed with an energy scale of ~50 meV. The strength of the kink changes with doping, but the energy scale remains the same. Furthermore, these results provide the first noncuprate platform for exploring the relationship between the pseudogap, d-wave instability, and electron-boson coupling in doped Mott insulators.

Authors:
 [1];  [2];  [1];  [3];  [3];  [1];  [4];  [4];  [5];  [5];  [1];  [3];  [5];  [1];  [6];  [3];  [2]; ORCiD logo [1]
+ Show Author Affiliations
  1. Univ. of Science and Technology of China, Anhui (China)
  2. Univ. of California, Santa Barbara, CA (United States)
  3. Northeastern Univ., Boston, MA (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Hiroshima Univ. (Japan)
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
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). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1596337
Alternate Identifier(s):
OSTI ID: 1575802
Grant/Contract Number:  
AC02-76SF00515; FG02-07ER46352; AC02-05CH11231; DMR-1905801
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 21; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Pseudogap; Quasiparticles & collective excitations; Spin-orbit coupling; Superconductivity; Mott insulators; Single crystal materials; Strongly correlated systems; Angle-resolved photoemission spectroscopy; First-principles calculations

Citation Formats

Hu, Yong, Chen, Xiang, Peng, S. -T., Lane, C., Matzelle, M., Sun, Z. -L., Hashimoto, M., Lu, D. -H., Schwier, E. F., Arita, M., Wu, T., Markiewicz, R. S., Shimada, K., Chen, X. -H., Shen, Z. -X., Bansil, A., Wilson, S. D., and He, J. -F. Spectroscopic Evidence for Electron-Boson Coupling in Electron-Doped Sr2IrO4. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.123.216402.
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Hu, Yong, Chen, Xiang, Peng, S. -T., Lane, C., Matzelle, M., Sun, Z. -L., Hashimoto, M., Lu, D. -H., Schwier, E. F., Arita, M., Wu, T., Markiewicz, R. S., Shimada, K., Chen, X. -H., Shen, Z. -X., Bansil, A., Wilson, S. D., & He, J. -F. Spectroscopic Evidence for Electron-Boson Coupling in Electron-Doped Sr2IrO4. United States. https://doi.org/10.1103/PhysRevLett.123.216402
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Hu, Yong, Chen, Xiang, Peng, S. -T., Lane, C., Matzelle, M., Sun, Z. -L., Hashimoto, M., Lu, D. -H., Schwier, E. F., Arita, M., Wu, T., Markiewicz, R. S., Shimada, K., Chen, X. -H., Shen, Z. -X., Bansil, A., Wilson, S. D., and He, J. -F. Thu . "Spectroscopic Evidence for Electron-Boson Coupling in Electron-Doped Sr2IrO4". United States. https://doi.org/10.1103/PhysRevLett.123.216402. https://www.osti.gov/servlets/purl/1596337.
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@article{osti_1596337,
title = {Spectroscopic Evidence for Electron-Boson Coupling in Electron-Doped Sr2IrO4},
author = {Hu, Yong and Chen, Xiang and Peng, S. -T. and Lane, C. and Matzelle, M. and Sun, Z. -L. and Hashimoto, M. and Lu, D. -H. and Schwier, E. F. and Arita, M. and Wu, T. and Markiewicz, R. S. and Shimada, K. and Chen, X. -H. and Shen, Z. -X. and Bansil, A. and Wilson, S. D. and He, J. -F.},
abstractNote = {The pseudogap, d-wave superconductivity and electron-boson coupling are three intertwined key ingredients in the phase diagram of the cuprates. Sr2IrO4 is a 5d-electron counterpart of the cuprates in which both the pseudogap and a d-wave instability have been observed. Here, we report spectroscopic evidence for the presence of the third key player in electron-doped Sr2IrO4: electron-boson coupling. A kink in nodal dispersion is observed with an energy scale of ~50 meV. The strength of the kink changes with doping, but the energy scale remains the same. Furthermore, these results provide the first noncuprate platform for exploring the relationship between the pseudogap, d-wave instability, and electron-boson coupling in doped Mott insulators.},
doi = {10.1103/PhysRevLett.123.216402},
journal = {Physical Review Letters},
number = 21,
volume = 123,
place = {United States},
year = {2019},
month = {11}
}
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https://doi.org/10.1103/PhysRevLett.123.216402
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