Infrared Transparent and Electromagnetic Shielding Correlated Metals via Lattice-Orbital-Charge Coupling

Youngkyoung Ha; Jinho Byun; Jaekwang Lee; Jaeseok Son; Younghak Kim; Shinbuhm Lee

doi:10.1021/acs.nanolett.2c01487

Infrared Transparent and Electromagnetic Shielding Correlated Metals via Lattice-Orbital-Charge Coupling

Nano Lett. 2022 Aug 24;22(16):6573-6579. doi: 10.1021/acs.nanolett.2c01487. Epub 2022 Aug 8.

Authors

Youngkyoung Ha¹, Jinho Byun², Jaekwang Lee², Jaeseok Son^{3

4}, Younghak Kim⁵, Shinbuhm Lee¹

Affiliations

¹ Department of Physics and Chemistry, Department of Emerging Materials Science, DGIST, Daegu 42988, Republic of Korea.
² Department of Physics, Pusan National University, Busan 46241, Republic of Korea.
³ Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Republic of Korea.
⁴ Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea.
⁵ Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, Republic of Korea.

PMID: 35939658
DOI: 10.1021/acs.nanolett.2c01487

Abstract

Despite being a requisite for modern transparent electronics, few metals have a sufficiently high infrared transmittance due to the free electron response. Here, upon alloying the correlated metal SrVO₃ with BaVO₃, the medium wavelength infrared transmittance at a wavelength of 4 μm is found to be 50% higher than those for Sn-doped In₂O₃ (ITO) and La-doped BaSnO₃ (BLSO). The room temperature resistivity of the alloy of ∼100 μΩ cm is 1 order of magnitude lower than those of ITO and BLSO, guaranteeing a profound electromagnetic shielding effectiveness of 22-31 dB at 10 GHz in the X-band. Systematic investigations reveal symmetry breaking of VO₆ oxygen octahedra in SrVO₃ due to the substitution of Sr²⁺ with larger Ba²⁺ ions, localization of electrons in the lower energy V-d_yz and d_zx orbitals, and stronger correlation effects. The lattice-orbital-charge-coupled engineering of the electronic band structure in correlated metals offers a new design strategy to create super-broad-band transparent conductors with an enhanced shielding capability.

Keywords: Correlated transparent conductors; Sr1−xBaxVO3; high electromagnetic shielding effectiveness; lattice-orbital-charge coupling; medium wavelength infrared transmittance.