110 citations · 378 across the 15 of their papers we have counts for
8 papers · 1 filter
Ground-State Phase Diagram of an Anisotropic S=1 Ferromagnetic-Antiferromagnetic Bond-Alternating Chain
Kiyomi Okamoto, Takashi Tonegawa, Makoto Kaburagi +1
By using mainly numerical methods, we investigate the ground-state phase diagram (GSPD) of an ferromagnetic-antiferromagnetic bond-alternating chain with the and the on…
Edge Modes in the Intermediate-D and Large-D Phases of the S=2 Quantum Spin Chain with XXZ and On-Site Anisotropies
Kiyomi Okamoto, Takashi Tonegawa, Toru Sakai +1
We investigate the edge modes at T=0 in the intermediate-D (ID) phase and the large-D (LD) phase of the S=2 quantum spin chain with the XXZ anisotropy and the generalized on-site a…
Haldane, Large-D and Intermediate-D States in an S=2 Quantum Spin Chain with On-Site and XXZ Anisotropies
Takashi Tonegawa, Kiyomi Okamoto, Hiroki Nakano +3
Using mainly numerical methods, we investigate the ground-state phase diagram of the S=2 quantum spin chain described by $H = \sum_j (S_j^x S_{j+1}^x + S_j^y S_{j+1}^y + ΔS_j^z S_{…
Magnetic properties of the distorted diamond chain at T=0
Kiyomi Okamoto, Takashi Tonegawa, Makoto Kaburagi
We explore, at T=0, the magnetic properties of the antiferromagnetic distorted diamond chain described by the Hamiltonian ${\cal H} = \sum_{j=1}^{N/3}{J_1 ({\bi S}_{3j-1} \…
Ground State Properties of an S=1/2 Distorted Diamond Chain
Takashi Tonegawa, Kiyomi Okamoto, Toshiya Hikihara +2
We investigate the ground state properties of an S=1/2 distorted diamond chain described by the Hamiltonian ${\cal H}=J_1\sum_\ell\bigl\{\bigl(\vecS_{3\ell-1}\cdot\vecS_{3\ell} +\v…
Ground-State and Thermodynamic Properties of the Quantum Mixed Spin-1/2-1/2-1-1 Chain
Takashi Tonegawa, Toshiya Hikihara, Makoto Kaburagi +3
We investigate both analytically and numerically the ground-state and thermodynamic properties of the quantum mixed spin-1/2-1/2-1-1 chain described by the Hamiltonian $H=\sum_{\el…
One-dimensional Heisenberg antiferromagnet in which two S=1/2 and two S=1 spins are arranged alternatively
T. Tonegawa, T. Hikihara, T. Nishino +3
Ground-state and thermodynamic properties of the one-dimensional Heisenberg antiferromagnet in which two S=1/2 and two S=1 spins are arranged alternatively are studied by a quantum…
Ground-state magnetization curve of a generalized spin-1/2 ladder
Takashi Tonegawa, Takeshi Nishida, Makoto Kaburagi
Employing a method of exact diagonalization for finite-size systems, we investigate the magnetization curve in the ground state of an antiferromagnetic spin-1/2 ladder with additio…