Hollandite ruthenate K2Ru8O16 as a new Tomonaga-Luttinger-liquid system

Abstract

The electronic structure of hollandite ruthenate K2Ru 8O16 is calculated using the generalized gradient approximation in the density functional theory, where the Hubbard-type repulsive interaction is taken into account. We find that the band structure near the Fermi level consists only of a single band, which is highly quasi-one- dimensional, exactly at half filling, and has a pair of two nearly-parallel sheetlike Fermi surfaces separated by π/c. These results are consistent with observed quasi-one-dimensional transport properties of the material and thus establish that K2Ru8O16 belongs to a class of Tomonaga-Luttinger-liquid systems. © Published under licence by IOP Publishing Ltd.