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Novel Synthesis Method of Nonstoichiometric Na2-xIrO3. Crystal Structure, Transport and Magnetic Properties.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Rolfs Katharina, Pomjakushina Ekaterina, Sheptyakov Denis, Conder Kazimierz,
Project Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials
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Original article (peer-reviewed)

Journal Journal of Chemistry and Chemical Engineering
Volume (Issue) 10
Page(s) 153 - 160
Title of proceedings Journal of Chemistry and Chemical Engineering
DOI 10.17265/1934-7375/2016.04.001

Open Access

Type of Open Access Repository (Green Open Access)


Abstract: Transition metal oxides with 4d or 5d metals are of great interest due to the competing interactions, of the Coulomb repulsion and the itineracy of the d-electrons, opening a possibility of building new quantum ground states. Particularly the 5d metal oxides containing Iridium have received significant attention within the last years, due to their unexpected physical properties, caused by a strong spin orbit coupling observed in Ir(IV). A prominent example is the Mott-insulator Sr2IrO4. Another member of this family, the honeycomb lattice compound Na2IrO3, also being a Mott-insulator having, most probably, a Kitaev spin liquid ground state. By deintercalating sodium from Na2IrO3, the authors were able to synthesize a new honeycomb lattice compound with more than 50% reduced sodium content. The reduction of the sodium content in this layered compound leads to a change of the oxidation state of iridium from + IV to + V/+ VI and a symmetry change from C2/c to P-3. This goes along with significant changes of the physical properties. Besides the vanishing magnetic ordering at 15 K, also the transport properties changes and instead insulating semiconducting properties are observed.