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Open Access Publications from the University of California

Observation of a d-wave gap in electron-doped Sr 2 IrO 4

  • Author(s): Kim, YK
  • Sung, NH
  • Denlinger, JD
  • Kim, BJ
  • et al.

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High-temperature superconductivity in cuprates emerges out of a highly enigmatic pseudogap'metal phase. The mechanism of high-temperature superconductivity is probably encrypted in the elusive relationship between the two phases, which spectroscopically is manifested as Fermi arcs - disconnected segments of zero-energy states - collapsing into d-wave point nodes upon entering the superconducting phase. Here, we reproduce this distinct cuprate phenomenology in the 5d transition-metal oxide Sr IrO . Using angle-resolved photoemission, we show that the clean, low-temperature phase of 6-8% electron-doped Sr IrO has gapless excitations only at four isolated points in the Brillouin zone, with a predominant d-wave symmetry of the gap. Our work thus establishes a connection between the low-temperature d-wave instability and the previously reported high-temperature Fermi arcs in electron-doped Sr IrO (ref.). Although the physical origin of the d-wave gap remains to be understood, Sr IrO is the first non-cuprate material to spectroscopically reproduce the complete phenomenology of the cuprates, thus offering a new material platform to investigate the relationship between the pseudogap and the d-wave gap. 2 4 2 4 2 4 2 4

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