62 citations · 185 across the 9 of their papers we have counts for
8 papers · 1 filter
Quantum paramagnetic states in the spin-1/2 distorted honeycomb-lattice Heisenberg antiferromagnet -- application to Cu(pymca)(ClO)
Tokuro Shimokawa, Ken'ichi Takano, Zentaro Honda +2
We investigate the ground-state phase diagram of a spin-1/2 honeycomb-lattice antiferromagnetic (AF) Heisenberg model with three exchange interactions, , , an…
Dimer-Monomer Ground State for Extended Spin-1/2 Diamond Chain
Ken'ichi Takano
We present a condition in which the dimer-monomer state is exactly the ground state of an extended diamond chain with spin magnitude 1/2. The Hamiltonian of the extended diamond ch…
Ground State Phase Diagram of S=1 Diamond Chains
Kazuo Hida, Ken'ichi Takano
We investigate the ground-state phase diagram of a spin-1 diamond chain. Owing to a series of conservation laws, any eigenstate of this system can be expressed using the eigenstate…
Exact degenerate ground states for the F-AF spin chain with bond alternation
Hidenori Suzuki, Ken'ichi Takano
We investigate the - spin chain consisting of spins with magnitude . The nearest-neighbor and the next-nearest-neighbor exchange interactions are ferromagnetic a…
Frustration Induced Quantum Phases in Mixed Spin Chain with Frustrated Side Chains
Kazuo Hida, Ken'ichi Takano
A mixed Heisenberg spin chain with frustrated side chains is investigated by numerical and perturbational calculations. A frustration-induced quantum partially polarized ferrimagne…
Disordered ground states in a quantum frustrated spin chain with side chains
Ken'ichi Takano, Kazuo Hida
We study a frustrated mixed spin chain with side chains, where the spin species and the exchange interactions are spatially varied. A nonlinear sigma model method is formulated for…