K. Okamoto

activity

19952025

S = 1/2

distorted diamond chain at T=0

110 citations · 859 across the 63 of their papers we have counts for

collaborators

Showing cond-matShow all

7 papers · 1 filter

cond-mat1997★ 22 cited

Theoretical analysis of the experiments on the double-spin-chain compound -- KCuCl $_{3}$

Tota Nakamura, Kiyomi Okamoto

We have analyzed the experimental susceptibility data of KCuCl $_{3}$ and found that the data are well-explained by the double-spin-chain models with strong antiferromagnetic dimeriza…

cond-mat1997★ 6 cited

Haldane and dimer gap in general double spin-chain models

Tota Nakamura, Satoshi Takada, Kiyomi Okamoto +1

We have obtained an analytic expression for the $k$ dependence of excitation energy gap for an arbitrary double $S = 1/2$ spin-chain by using the nonlocal unitary transformation and…

cond-mat1995★ 94 cited

Phase Diagram of $S = 1$ Bond-Alternating XXZ chains

Atsuhiro Kitazawa, Kiyohide Nomura, Kiyomi Okamoto

The phase transitions between the XY, the dimer and the Haldane phases of the spin-1 bond-alternating XXZ chain are studied by the numerical diagonalization. We determine the phase…

cond-mat1995★ 8 cited

Critical Properties of the transition between the Haldane phase and the large-D phase of the spin-1/2 ferromagnetic-antiferromagnetic Heisenberg chain with on-site anisotropy"

Kiyomi Okamoto

We analytically study the ground-state quantum phase transition between the Haldane phase and the large- $D$ (LD) phase of the $S = 1/2$ ferromagnetic-antiferromagnetic alternating He…

cond-mat1995

Dimer Correlarions in Spin-1/2 Alternating XY Chain

Yohei Saika, Kiyomi Okamoto

We investigate the long-distance asymptotic behavior of the dimer correlations in the spin-1/2 alternating $X Y$ chain both at T=0 and at sufficiently low-temperatures. The correlati…

cond-mat1995★ 85 cited

Plateau of the Magnetization Curve of the S=1/2 Ferromagnetic-Ferromagnetic-Antiferromagnetic Spin Chain

Kiyomi Okamoto

I analytically study the plateau of the magnetization curve at $M / M_{S} = 1/3$ (where $M_{S}$ is the saturation magnetization) of the one-dimensional $S = 1/2$ trimerized Hei…

cond-mat1995★ 15 cited

Critical Properties of the XXZ chain in External Staggered Magnetic Field

Kiyomi Okamoto, Kiyohide Nomura

We comment on the recent work of Alcaraz and Malvezzi [1995 {\it J. Phys. A: Math. Gen.} {\bf 19} 1521] for the critical properties of the $S = 1/2$ $X X Z$ chain in staggered magnetic…

Theoretical analysis of the experiments on the double-spin-chain compound -- KCuCl3​