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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)
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 Quantum Magnetism - Spinons, Skyrmions and Dipoles
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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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