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222 results on '"Endoh S"'

2. Three Dimensional Heisenberg Spin Glass Models with and without Random Anisotropy

Author

Matsubara, F, Shirakura, T, Endoh, S, and Takahashi, S

Subjects
Condensed Matter - Disordered Systems and Neural Networks
Abstract

We reexamine the spin glass (SG) phase transition of the $\pm J$ Heisenberg models with and without the random anisotropy $D$ in three dimensions ($d = 3$) using complementary two methods, i.e., (i) the defect energy method and (ii) the Monte Carlo method. We reveal that the conventional defect energy method is not convincing and propose a new method which considers the stiffness of the lattice itself. Using the method, we show that the stiffness exponent $\theta$ has a positive value ($\theta > 0$) even when $D = 0$. Considering the stiffness at finite temperatures, we obtain the SG phase transition temperature of $T_{\rm SG} \sim 0.19J$ for $D = 0$. On the other hand, a large scale MC simulation shows that, in contrary to the previous results, a scaling plot of the SG susceptibility $\chi_{\rm SG}$ for $D = 0$ is obtained using almost the same transiton temperature of $T_{\rm SG} \sim 0.18J$. Hence we believe that the SG phase transition occurs in the Heisenberg SG model in $d = 3$., Comment: 15 pages, 9 figures, to be published in J. Phys. A

Published
2003
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3. Stiffness of the Heisenberg Spin-Glass Model at Zero- and Finite-Temperatures in Three Dimensions

Author

Endoh, S., Matsubara, F., and Shirakura, T.

Subjects
Condensed Matter - Disordered Systems and Neural Networks
Abstract

We examine the stiffness of the Heisenberg spin-glass (SG) model at both zero temperature (T=0) and finite temperatures ($T \ne 0$) in three dimensions. We calculate the excess energies at T=0 which are gained by rotating and reversing all the spins on one surface of the lattice, and find that they increase with the lattice size $L$. We also calculate the excess free-energies at $T \ne 0$ which correspond to these excess energies, and find that they increase with $L$ at low temperatures, while they decrease with increasing $L$ at high temperatures. These results strongly suggest the occurrence of the SG phase at low temperatures. The SG phase transition temperature is estimated to be $T_{\rm SG} \sim 0.19J$ from the lattice size dependences of these excess free-energies., Comment: 9pages, 8figures, submitted to J. Phys. Soc. Jpn

Published
2001
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4. Phase Transition of a Heisenberg Spin-Glass Model in Three Dimensions

Author

Matsubara, F., Shirakura, T., and Endoh, S.

Subjects
Condensed Matter - Disordered Systems and Neural Networks
Abstract

We study the phase transition of the $\pm J$ Heisenberg model in three dimensions. Using a dynamical simulation method that removes a drift of the system, the existence of the spin-glass (SG) phase at low temperatures is suggested. The transition temperature is estimated to be $T_{\rm SG} \sim 0.18J$ from both equilibrium and off-equilibrium Monte-Carlo simulations. Our result contradicts the chirality mechanism of the phase transition reported recently by Kawamura which claims that it is not the spins but the chiralities of the spins that are ordered in Heisenberg SG systems., Comment: 10 pages, 6 figures

Published
2000

7. The prebending strain effect on [Nb.sub.3]Sn superconducting cabling conductors

Author

Tsubouchi, H., Endoh, S., Meguro, S., Watanabe, K., Awaji, S., and Nishijima, G.

Subjects
Niobium -- Magnetic properties, Niobium -- Electric properties, Superconducting magnets -- Mechanical properties, Superconducting magnets -- Electric properties, Tin alloys -- Magnetic properties, Tin alloys -- Electric properties, Business, Electronics, Electronics and electrical industries
Abstract

The prebending strain effect on cabling conductors fabricated with high strength [Nb.sub.3]Sn wires and conventional [Nb.sub.3]Sn wires is evaluated by using a react-and-wind method. High strength [Nb.sub.3]Sn wire and the prebending strain effect are useful for developing the superconducting cabling conductors with large current capacity and high strength.

Published
2008

13. (Nb,Ti)3Sn superconducting wire reinforced with Nb-Ti-Cu compound

Author

Sakamoto, H., Higuchi, M., Endoh, S., Nagasu, Y., Kimura, A., Wada, K., Meguro, s., and Ikeda, M.

Subjects
Superconducting magnets -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The use of Nb3Sn wire for high field superconducting magnets and the selecton of an intermetallic compound as reinforcement is investigated.

Published
2000

26. Cellular responses induced by cerium oxide nanoparticles: induction of intracellular calcium level and oxidative stress on culture cells

Author

Horie, M., primary, Nishio, K., additional, Kato, H., additional, Fujita, K., additional, Endoh, S., additional, Nakamura, A., additional, Miyauchi, A., additional, Kinugasa, S., additional, Yamamoto, K., additional, Niki, E., additional, Yoshida, Y., additional, Hagihara, Y., additional, and Iwahashi, H., additional

Published
2011
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