878 citations · 4k across the 83 of their papers we have counts for
5 papers · 1 filter
Resonating Valence-Bond State in an Orbitally Degenerate Quantum Magnet with Dynamical Jahn-Teller Effect
Joji Nasu, Sumio Ishihara
Short-range resonating-valence bond states in an orbitally degenerate magnet on a honeycomb lattice is studied. A quantum-dimer model is derived from the Hamiltonian which represen…
Low-energy Majorana states in spin-liquid transitions in a three-dimensional Kitaev model
Joji Nasu, Masafumi Udagawa, Yukitoshi Motome
A three-dimensional Kitaev model on a hyperhoneycomb lattice is investigated numerically at finite temperature. The Kitaev model is one of the solvable quantum spin models, where t…
Vaporization of Kitaev spin liquids
Joji Nasu, Masafumi Udagawa, Yukitoshi Motome
Quantum spin liquid is an exotic quantum state of matter in magnets. This state is a spin analogue of the liquid helium which does not solidify down to the lowest temperature due t…
Spin-orbit coupling in octamers in a spinel sulfide CuIrS: Competition between spin-singlet and quadrupolar states, and its relevance to remnant paramagnetism
Joji Nasu, Yukitoshi Motome
We theoretically investigate magnetic properties in the low-temperature phase with the formation of eight-site clusters, octamers, in the spinel compound CuIrS. The octamer…
Absence of Jahn-Teller transition in the hexagonal Ba3CuSb2O9 single crystal
N. Katayama, K. Kimura, Y. Han +15
We present a comprehensive structural study on perovskite-type 6H-Ba3CuSb2O9, which exhibits a spin-orbital short-range ordering on a honeycomb-based lattice. By combining synchrot…