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

26 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).

Funding

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).

Funders	Funder number
Kentucky Science and Engineering Foundation
SSAS
U.S. Department of Energy Oak Ridge National Laboratory U.S. Department of Energy National Science Foundation National Energy Research Scientific Computing Center	DE-FG02-97ER45653
Center for Advanced Meta-Materials	DMR-0856234, DMR-1265162, DMR-1262261
Not added	0814194, 0856234
Kentucky Science and Technology Corporation	KSEF-148-502-12-303

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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