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Crystal Structure, Transport, and Magnetic Properties of an Ir6+ Compound Ba8Al2IrO14

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2015
Author Yang Lin, Pisoni Andrea, Magrez Arnaud, Katrych Sergiy, Arakcheeva Alla, Dalla Piazza Bastien, Prsa Krunoslav, Jacimovic Jacim, Akrap Ana, Teyssier Jeremie, Forro Laszlo, Ronnow Henrik M.,
Project Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials
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Original article (peer-reviewed)

Journal INORGANIC CHEMISTRY
Volume (Issue) 54(9)
Page(s) 4371 - 4376
Title of proceedings INORGANIC CHEMISTRY
DOI 10.1021/acs.inorgchem.5b00157

Open Access

URL https://infoscience.epfl.ch/record/207423?ln=en
Type of Open Access Repository (Green Open Access)

Abstract

The novel iridate Ba8Al2IrO14 was prepared as single crystals by self-flux method, thereby providing a rare example of an all-Ir(VI) compound that can be synthesized under ambient pressure conditions. The preparation of all-Ir6+ iridate without using traditional high-pressure techniques has to our knowledge previously only been reported in Nd2K2IrO7 and Sm2K2IrO7. The monoclinic crystal structure (space group C2/m, No.12) is stable down to 90 K and contains layers of IrO6 octahedra separated by Ba and AlO4 tetrahedra. The material exhibits insulating behavior with a narrow band gap of ∼0.6 eV. The positive Seebeck coefficient indicates hole-like dominant charge carriers. Susceptibility measurement shows antiferromagnetic coupling with no order down to 2 K.
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