Anisotropic electronic properties of a-axis-oriented Sr2IrO 4 epitaxial thin-films

J. Nichols; O. B. Korneta; J. Terzic; L. E. De Long; G. Cao; J. W. Brill; S. S.A. Seo

doi:10.1063/1.4822334

Anisotropic electronic properties of a-axis-oriented Sr₂IrO ₄ epitaxial thin-films

J. Nichols, O. B. Korneta, J. Terzic, L. E. De Long, G. Cao, J. W. Brill, S. S.A. Seo

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

We have investigated the transport and optical properties along the c-axis of a-axis-oriented Sr₂IrO₄ epitaxial thin-films grown on LaSrGaO₄ (100) substrates. The c-axis resistivity is approximately one order of magnitude larger than that of the ab-plane. Optical absorption spectra with Ec polarization show both Ir 5d intersite transitions and charge-transfer transitions (O 2p to Ir 5d), while E//c spectra show only the latter. The structural anisotropy created by biaxial strain in a-axis-oriented thin-films also changes the electronic structure and gap energy. These a-axis-oriented, epitaxial thin-films provide a powerful tool to investigate the highly anisotropic electronic properties of Sr₂IrO₄.

Original language	English
Article number	131910
Journal	Applied Physics Letters
Volume	103
Issue number	13
DOIs	https://doi.org/10.1063/1.4822334
State	Published - Sep 23 2013

Bibliographical note

Funding Information:
We appreciate Emily Bittle for her help with the FT-IR measurements. This research was supported by the NSF through Grant Nos. EPS-0814194 (the Center for Advanced Materials), DMR-1262261 (JWB), DMR-0856234 (GC), DMR-1265162 (GC), by U.S. DoE through Grant No. DE-FG02-97ER45653 (LED), and by the Kentucky Science and Engineering Foundation with the Kentucky Science and Technology Corporation through Grant Agreement No. KSEF-148-502-12-303 (SSAS).

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

Access to Document

10.1063/1.4822334

Cite this

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title = "Anisotropic electronic properties of a-axis-oriented Sr2IrO 4 epitaxial thin-films",

abstract = "We have investigated the transport and optical properties along the c-axis of a-axis-oriented Sr2IrO4 epitaxial thin-films grown on LaSrGaO4 (100) substrates. The c-axis resistivity is approximately one order of magnitude larger than that of the ab-plane. Optical absorption spectra with Ec polarization show both Ir 5d intersite transitions and charge-transfer transitions (O 2p to Ir 5d), while E//c spectra show only the latter. The structural anisotropy created by biaxial strain in a-axis-oriented thin-films also changes the electronic structure and gap energy. These a-axis-oriented, epitaxial thin-films provide a powerful tool to investigate the highly anisotropic electronic properties of Sr2IrO4.",

author = "J. Nichols and Korneta, {O. B.} and J. Terzic and {De Long}, {L. E.} and G. Cao and Brill, {J. W.} and Seo, {S. S.A.}",

note = "Funding Information: We appreciate Emily Bittle for her help with the FT-IR measurements. This research was supported by the NSF through Grant Nos. EPS-0814194 (the Center for Advanced Materials), DMR-1262261 (JWB), DMR-0856234 (GC), DMR-1265162 (GC), by U.S. DoE through Grant No. DE-FG02-97ER45653 (LED), and by the Kentucky Science and Engineering Foundation with the Kentucky Science and Technology Corporation through Grant Agreement No. KSEF-148-502-12-303 (SSAS).",

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AU - Nichols, J.

AU - Korneta, O. B.

AU - Terzic, J.

AU - De Long, L. E.

AU - Cao, G.

AU - Brill, J. W.

AU - Seo, S. S.A.

N1 - Funding Information: We appreciate Emily Bittle for her help with the FT-IR measurements. This research was supported by the NSF through Grant Nos. EPS-0814194 (the Center for Advanced Materials), DMR-1262261 (JWB), DMR-0856234 (GC), DMR-1265162 (GC), by U.S. DoE through Grant No. DE-FG02-97ER45653 (LED), and by the Kentucky Science and Engineering Foundation with the Kentucky Science and Technology Corporation through Grant Agreement No. KSEF-148-502-12-303 (SSAS).

PY - 2013/9/23

Y1 - 2013/9/23

N2 - We have investigated the transport and optical properties along the c-axis of a-axis-oriented Sr2IrO4 epitaxial thin-films grown on LaSrGaO4 (100) substrates. The c-axis resistivity is approximately one order of magnitude larger than that of the ab-plane. Optical absorption spectra with Ec polarization show both Ir 5d intersite transitions and charge-transfer transitions (O 2p to Ir 5d), while E//c spectra show only the latter. The structural anisotropy created by biaxial strain in a-axis-oriented thin-films also changes the electronic structure and gap energy. These a-axis-oriented, epitaxial thin-films provide a powerful tool to investigate the highly anisotropic electronic properties of Sr2IrO4.

AB - We have investigated the transport and optical properties along the c-axis of a-axis-oriented Sr2IrO4 epitaxial thin-films grown on LaSrGaO4 (100) substrates. The c-axis resistivity is approximately one order of magnitude larger than that of the ab-plane. Optical absorption spectra with Ec polarization show both Ir 5d intersite transitions and charge-transfer transitions (O 2p to Ir 5d), while E//c spectra show only the latter. The structural anisotropy created by biaxial strain in a-axis-oriented thin-films also changes the electronic structure and gap energy. These a-axis-oriented, epitaxial thin-films provide a powerful tool to investigate the highly anisotropic electronic properties of Sr2IrO4.

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