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Title: Hallmarks of the Mott-metal crossover in the hole-doped pseudospin-1/2 Mott insulator Sr 2IrO 4

The physics of doped Mott insulators remains controversial after decades of active research, hindered by the interplay among competing orders and fluctuations. It is thus highly desired to distinguish the intrinsic characters of the Mott-metal crossover from those of other origins. Here we investigate the evolution of electronic structure and dynamics of the hole-doped pseudospin-1/2 Mott insulator Sr 2 IrO 4 . The effective hole doping is achieved by replacing Ir with Rh atoms, with the chemical potential immediately jumping to or near the top of the lower Hubbard band. The doped iridates exhibit multiple iconic low-energy features previously observed in doped cuprates - pseudogaps, Fermi arcs and marginal-Fermi-liquid-like electronic scattering rates. We suggest these signatures are most likely an integral part of the material's proximity to the Mott state, rather than from many of the most claimed mechanisms, including preformed electron pairing, quantum criticality or density-wave formation.
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ; ORCiD logo [3] ;  [4] ;  [4] ;  [4] ;  [5] ;  [1] ;  [5] ;  [1]
  1. Univ. of Colorado, Boulder, CO (United States). Dept. of Physics
  2. Univ. of Colorado, Boulder, CO (United States). Dept. of Physics; Incheon National Univ. (Korea). Dept. of Physics
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  5. Univ. of Kentucky, Lexington, KY (United States). Center for Advanced Materials
Publication Date:
Grant/Contract Number:
AC02-05CH11231; FG0203ER4606; FG02-10ER46686; DMR-0537588
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; electronic properties and materials; electronic structure
OSTI Identifier: