Origin of Unexpected Ir3+ in a Superconducting Candidate Sr2IrO4 System Analyzed by Photoelectron HolographyClick to copy article linkArticle link copied!
- Rie Horie*Rie Horie*Email: [email protected]Research Institute for Interdisciplinary Science (RIIS), Okayama University, Okayama 700-8530, JapanMore by Rie Horie
- Tomohiro MatsushitaTomohiro MatsushitaGraduate School of Science and Technology, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, JapanMore by Tomohiro Matsushita
- Sota KawamuraSota KawamuraGraduate School of Science and Technology, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, JapanMore by Sota Kawamura
- Tsubasa HaseTsubasa HaseDepartment of Precision Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, JapanMore by Tsubasa Hase
- Kazumasa HoriganeKazumasa HoriganeResearch Institute for Interdisciplinary Science (RIIS), Okayama University, Okayama 700-8530, JapanMore by Kazumasa Horigane
- Hiroki MomonoHiroki MomonoNational Institute of Technology, Yonago College, Yonago, Tottori 683-8502, JapanMore by Hiroki Momono
- Soichiro TakeuchiSoichiro TakeuchiGraduate School of Science and Technology, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, JapanMore by Soichiro Takeuchi
- Masaki TanakaMasaki TanakaGraduate School of Science and Technology, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, JapanMore by Masaki Tanaka
- Hiroto TomitaHiroto TomitaGraduate School of Science and Technology, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, JapanMore by Hiroto Tomita
- Yusuke HashimotoYusuke HashimotoGraduate School of Science and Technology, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, JapanMore by Yusuke Hashimoto
- Kaya KobayashiKaya KobayashiResearch Institute for Interdisciplinary Science (RIIS), Okayama University, Okayama 700-8530, JapanGraduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Kaya Kobayashi
- Yuichi HaruyamaYuichi HaruyamaLaboratory of Advanced Science and Technology for Industry, University of Hyogo, Ako, Hyogo 678-1205, JapanMore by Yuichi Haruyama
- Hiroshi Daimon*Hiroshi Daimon*Email: [email protected]Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, JapanMore by Hiroshi Daimon
- Yoshitada MorikawaYoshitada MorikawaDepartment of Precision Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, JapanMore by Yoshitada Morikawa
- Munetaka Taguchi
- Jun AkimitsuJun AkimitsuResearch Institute for Interdisciplinary Science (RIIS), Okayama University, Okayama 700-8530, JapanMore by Jun Akimitsu
Abstract
The reason for the absence of superconductivity in Sr2IrO4 was estimated by photoelectron spectra and photoelectron holograms. The analysis of the La photoelectron hologram concluded that La atoms are substituted to Sr sites. Two O 1s peaks were observed and were identified as the oxygens in the IrO2 and SrO planes by photoelectron holography and density functional theory (DFT) calculations. In the Ir 4f spectrum of Sr2IrO4, an unexpected Ir3+ peak was observed as much as 50% of all of the Ir. The photoelectron hologram of Ir3+ showed a displacement of about 0.15 Å. This displacement is thought to be due to the oxygen vacancies in the IrO2 plane. These oxygen vacancies and the associated local displacement of the atoms might inhibit superconductivity in spite of sufficient electron doping.
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This article is cited by 2 publications.
- Yusuke Hashimoto, Jun Mizuno, Hiroyuki Matsuda, Fumihiko Matsui, Tomohiro Matsushita. High-resolution electron energy analyzer with wide acceptance angle for hard X-ray photoelectron holography: integrating PESCATORA and retarding field analyzer. Japanese Journal of Applied Physics 2024, 63
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