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Superconductivity in RhGa and IrGa without Inversion Symmetry
T. Shibayama, M. Nohara, H. Aruga Katori +3
Superconductivity with 2 K was discovered in the intermetallic binary compounds RhGa and IrGa. This is the first observation of superconductivi…
Spin-Liquid State in the S = 1/2 Hyperkagome Antiferromagnet Na4Ir3O8
Yoshihiko Okamoto, Minoru Nohara, Hiroko Aruga-Katori +1
A spinel related oxide, Na4Ir3O8, was found to have a three dimensional network of corner shared Ir4+ (t2g^5) triangles. This gives rise to an antiferromagnetically coupled S = 1/2…
Precise Control of Band Filling in NaxCoO2
Daisuke Yoshizumi, Yuji Muraoka, Yoshihiko Okamoto +5
Electronic properties of the sodium cobaltate NaxCoO2 are systematically studied through a precise control of band filling. Resistivity, magnetic susceptibility and specific heat m…
Metal-insulator Transition in a Pyrochlore-type Ruthenium oxide, Hg2Ru2O7
Ayako Yamamoto, Peter A. Sharma, Yoshihiko Okamoto +5
A new pyrochlore ruthenium oxide, Hg2Ru2O7 was synthesized under a high pressure of 6 GPa. In contrast to the extensively studied Ru4+ oxides, this compound possesses a novel Ru5+…