Electronic nature of the pseudogap in electron-doped Sr2IrO4

Peng, Shuting; Lane, Christopher; Hu, Yong; Guo, Mingyao; Chen, Xiang; Sun, Zeliang; Hashimoto, Makoto; Lu, Donghui; Shen, Zhi-Xun; Wu, Tao; Chen, Xianhui; Markiewicz, Robert S.; Wang, Yao; Bansil, Arun; Wilson, Stephen D.; He, Junfeng

doi:10.1038/s41535-022-00467-1

Title: Electronic nature of the pseudogap in electron-doped Sr₂IrO₄

Journal Article · Fri Jun 03 00:00:00 EDT 2022 · npj Quantum Materials

DOI:https://doi.org/10.1038/s41535-022-00467-1· OSTI ID:1877683

^[1]; Lane, Christopher ^[2];

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^[1]; Markiewicz, Robert S. ^[6];

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Univ. of Science and Technology of China, Hefei (China)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)
Univ. of California, Santa Barbara, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
Northeastern Univ., Boston, MA (United States)
Clemson Univ., SC (United States)

In high-temperature ($$T_c$$) cuprate superconductors, many exotic phenomena are rooted in the enigmatic pseudogap state, which has been interpreted as consisting of preformed Cooper pairs or competing orders or a combination thereof. Observation of pseudogap phenomenologically in electron-doped Sr₂IrO₄—the 5d electron counterpart of the cuprates, has spurred intense interest in the strontium iridates as a testbed for exploring the exotic physics of the cuprates. Here, we examine the pseudogap state of electron-doped Sr₂IrO₄ by angle-resolved photoemission spectroscopy (ARPES) and parallel theoretical modeling. Our analysis demonstrates that the pseudogap state of Sr₂IrO₄ appears without breaking the particle–hole symmetry or inducing spectral broadening which are telltale signatures of competing orders in the cuprates. We find quasiparticle dispersion and its temperature dependence in the pseudogap state of Sr₂IrO₄ to point to an electronic order with a zero scattering wave vector and limited correlation length. Particle–hole symmetric preformed Cooper pairs are discussed as a viable mechanism for such an electronic order. The potential roles of incommensurate density waves are also discussed.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NSFC); Fundamental Research Funds for the Central Universities; National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC02-76SF00515; DMR-1905801; FG02-07ER46352; AC02-05CH11231; 89233218CNA000001; DMR-2132338

OSTI ID:: 1877683

Alternate ID(s):: OSTI ID: 1880275; OSTI ID: 1884753

Report Number(s):: LA-UR-20-26487; TRN: US2307422

Journal Information:: npj Quantum Materials, Vol. 7, Issue 1; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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