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Spin-orbit coupling induced semi-metallic state in the 1/3 hole-doped hyper-kagome Na$$_3$$Ir$$_3$$O$$_8$$

Takayama, Tomohiro*; Yaresko, A.*; Matsumoto, Akiyo*; Nuss, J.*; Ishii, Kenji; Yoshida, Masahiro*; Mizuki, Junichiro; Takagi, Hidenori*

The complex iridium oxide Na$$_3$$Ir$$_3$$O$$_8$$ with a B-site ordered spinel structure was synthesized in single crystalline form, where the chiral hyper-kagome lattice of Irions, as observed in the spin-liquid candidate Na$$_4$$Ir$$_3$$O$$_8$$, was identified. The average valence of Ir is 4.33+ and, therefore, Na$$_3$$Ir$$_3$$O$$_8$$ can be viewed as a doped analogue of the hyper-kagome spin liquid with Ir$$^{4+}$$. The transport measurements, combined with the electronic structure calculations, indicate that the ground state of Na$$_3$$Ir$$_3$$O$$_8$$ is a low carrier density semi-metal. We argue that the semi-metallic state is produced by a competition of the molecular orbital splitting of $$t_{2g}$$ orbitals on Ir$$_3$$ triangles with strong spin-orbit coupling inherent to heavy Ir ions.



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Category:Multidisciplinary Sciences



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