Hallmarks of the Mott-metal crossover in the hole-doped pseudospin-1/2 Mott insulator Sr2IrO4

Cao, Yue; Wang, Qiang; Waugh, Justin A.; Reber, Theodore J.; Li, Haoxiang; Zhou, Xiaoqing; Parham, Stephen; Park, S. -R.; Plumb, Nicholas C.; Rotenberg, Eli; Bostwick, Aaron; Denlinger, Jonathan D.; Qi, Tongfei; Hermele, Michael A.; Cao, Gang; Dessau, Daniel S.

doi:10.1038/ncomms11367

Title: Hallmarks of the Mott-metal crossover in the hole-doped pseudospin-1/2 Mott insulator Sr₂IrO₄

Journal Article · Fri Apr 22 00:00:00 EDT 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms11367· OSTI ID:1379297

^[1]; Wang, Qiang ^[1]; Waugh, Justin A. ^[1]; Reber, Theodore J. ^[1]; Li, Haoxiang ^[1]; Zhou, Xiaoqing ^[1]; Parham, Stephen ^[1]; Park, S. -R. ^[2];

^[3]; Rotenberg, Eli ^[4]; Bostwick, Aaron ^[4]; Denlinger, Jonathan D. ^[4]; Qi, Tongfei ^[5]; Hermele, Michael A. ^[1]; Cao, Gang ^[5]; Dessau, Daniel S. ^[1]

Univ. of Colorado, Boulder, CO (United States). Dept. of Physics
Univ. of Colorado, Boulder, CO (United States). Dept. of Physics; Incheon National Univ. (Korea). Dept. of Physics
Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
Univ. of Kentucky, Lexington, KY (United States). Center for Advanced Materials

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231; FG0203ER4606; FG02-10ER46686; DMR-0537588

OSTI ID:: 1379297

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 86 works

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Title: Hallmarks of the Mott-metal crossover in the hole-doped pseudospin-1/2 Mott insulator Sr2IrO4

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Title: Hallmarks of the Mott-metal crossover in the hole-doped pseudospin-1/2 Mott insulator Sr₂IrO₄