Zobrazeno 1 - 10
of 371
pro vyhledávání: '"Okunishi K"'
Autor:
Yamaguchi, H., Miyagai, H., Yoshida, M., Takigawa, M., Iwase, K., Ono, T., Kase, N., Araki, K., Kittaka, S., Sakakibara, T., Shimokawa, T., Okubo, T., Okunishi, K., Matsuo, A., Hosokoshi, Y.
Publikováno v:
Phys. Rev. B 89, 220402(R) (2014)
We report magnetization, specific heat, and NMR measurements of 3-Br-4-F-V [=3-(3-bromo-4-fluorophenyl)-1,5-diphenylverdazyl], a strong-rung S=1/2 Heisenberg spin ladder with ferromagnetic leg interactions. We explain the magnetic and thermodynamic p
Externí odkaz:
http://arxiv.org/abs/1406.2231
Autor:
Kimura, S., Matsuda, M., Masuda, T., Hondo, S., Kaneko, K., Metoki, N., Hagiwara, M., Takeuchi, T., Okunishi, K., He, Z., Kindo, K., Taniyama, T., Itoh, M.
From neutron diffraction measurements on a quasi-1D Ising-like Co$^{\rm 2+}$ spin compound BaCo$_{\rm 2}$V$_{\rm 2}$O$_{\rm 8}$, we observed an appearance of a novel type of incommensurate ordering in magnetic fields. This ordering is essentially dif
Externí odkaz:
http://arxiv.org/abs/0808.4073
Autor:
Kimura, S., Takeuchi, T., Okunishi, K., Hagiwara, M., He, Z., Kindo, K., Taniyama, T., Itoh, M.
High-field specific heat measurements on BaCo2V2O8, which is a good realization of an S = 1/2 quasi one-dimensional Ising-like antifferomagnet, have been performed in magnetic fields up to 12 T along the chain and at temperature down to 200 mK. We ha
Externí odkaz:
http://arxiv.org/abs/0707.3713
Publikováno v:
Journal of Physics: Condensed Matter 15, 3607 (2003)
We present a theoretical and experimental study of a quasi-one-dimensional zigzag antiferromagnet (N_2H_5)CuCl_3, which can be viewed as weakly coupled Heisenberg chains with a frustrated interaction. We first discuss generic features of the magnetic
Externí odkaz:
http://arxiv.org/abs/cond-mat/0208373
Publikováno v:
Phys. Rev. B 64, 104432 (2001)
We discuss an universal relation $\epsilon(i\kappa)=0$ with ${\rm Re} \kappa=1/\xi$ in 1D quantum spin systems with an excitation gap, where $\epsilon(k)$ is the dispersion curve of the low-energy excitation and $\xi$ is the correlation length of the
Externí odkaz:
http://arxiv.org/abs/cond-mat/0107021
Publikováno v:
Nucl. Phys. B575 (2000) 504-512
We propose a numerical variational method for three-dimensional (3D) classical lattice models. We construct the variational state as a product of local tensors, and improve it by use of the corner transfer matrix renormalization group (CTMRG), which
Externí odkaz:
http://arxiv.org/abs/cond-mat/0001083
Autor:
Nishino, T., Okunishi, K.
We review the variational principle in the density matrix renormalization group (DMRG) method, which maximizes an approximate partition function within a restricted degrees of freedom; at zero temperature, DMRG mini- mizes the ground state energy. Th
Externí odkaz:
http://arxiv.org/abs/cond-mat/9610107
We apply a recently developed numerical renormalization group, the corner-transfer-matrix renormalization group (CTMRG), to 2D classical lattice models at their critical temperatures. It is shown that the combination of CTMRG and the finite-size scal
Externí odkaz:
http://arxiv.org/abs/cond-mat/9601078
Autor:
Nishino, T., Okunishi, K.
The authors propose a fast numerical renormalization group method --- the product wave function renormalization group (PWFRG) method --- for 1D quantum lattice models and 2D classical ones. A variational wave function, which is expressed by a matrix
Externí odkaz:
http://arxiv.org/abs/cond-mat/9510004
Autor:
Nishino, T., Okunishi, K.
We propose a new fast numerical renormalization group method,the corner transfer matrix renormalization group (CTMRG) method, which is based on a unified scheme of Baxter's corner transfer matrix method and White's density matrix renormalization grou
Externí odkaz:
http://arxiv.org/abs/cond-mat/9507087