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

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24 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 languageEnglish
Article number131910
JournalApplied Physics Letters
Volume103
Issue number13
DOIs
StatePublished - 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)

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