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Spectroscopic Evidence for Electron-Boson Coupling in Electron-Doped Sr2 IrO4

Journal Article · · Physical Review Letters
 [1];  [2];  [1];  [3];  [3];  [1];  [4];  [4];  [5];  [5];  [1];  [3];  [5];  [1];  [6];  [3];  [2];  [1]
  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)
+ Show Author Affiliations
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.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515; FG02-07ER46352
OSTI ID:
1596337
Alternate ID(s):
OSTI ID: 1575802
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 123; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Angle-resolved photoemission spectroscopy
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Mott insulators
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Quasiparticles & collective excitations
Single crystal materials
Spin-orbit coupling
Strongly correlated systems
Superconductivity