Interface-engineered hole doping in Sr2IrO4/LaNiO3 heterostructure

Wen, Fangdi; Liu, Xiaoran; Zhang, Qinghua; Kareev, M.; Pal, B.; Cao, Yanwei; Freeland, J. W.; N’Diaye, A. T.; Shafer, P.; Arenholz, E.; Gu, Lin; Chakhalian, J.

doi:10.1088/1367-2630/ab452c

Interface-engineered hole doping in Sr₂IrO₄/LaNiO₃ heterostructure

Journal Article · Tue Oct 01 00:00:00 EDT 2019 · New Journal of Physics

DOI:https://doi.org/10.1088/1367-2630/ab452c· OSTI ID:1569088

; Liu, Xiaoran; Zhang, Qinghua; Kareev, M.; Pal, B.; Cao, Yanwei; Freeland, J. W.; N’Diaye, A. T.; Shafer, P.; Arenholz, E.; Gu, Lin; Chakhalian, J.

The relativistic Mott insulator Sr₂IrO₄ driven by large spin-orbit interaction is known for the J_eff = 1/2 antiferromagnetic state which closely resembles the electronic structure of parent compounds of superconducting cuprates. Here, we report the realization of hole-doped Sr₂IrO₄ by means of interfacial charge transfer in Sr₂IrO₄/LaNiO₃ heterostructures. X-ray photoelectron spectroscopy on Ir 4f edge along with the x-ray absorption spectroscopy at Ni L ₂ edge confirmed that 5d electrons from Ir sites are transferred onto Ni sites, leading to markedly electronic reconstruction at the interface. Although the Sr₂IrO₄/LaNiO₃ heterostructure remains non-metallic, we reveal that the transport behavior is no longer described by the Mott variable range hopping mode, but by the Efros-Shklovskii model. These findings highlight a powerful utility of interfaces to realize emerging electronic states of the Ruddlesden-Popper phases of Ir-based oxides.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Chinese Academy of Sciences (CAS); Gordon and Betty Moore Foundation; National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357; SC0012375

OSTI ID:: 1569088

Alternate ID(s):: OSTI ID: 1609143
OSTI ID: 1599811
OSTI ID: 22990826

Journal Information:: New Journal of Physics, Journal Name: New Journal of Physics Journal Issue: 10 Vol. 21; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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