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Nakagawa, Hiroshi; Kataoka, Mikio
no journal, ,
Water network pattern and dynamics are determined by hydrogen bonding. The physical properties of the hydration water is different from that of bulk water. The hydration affects the protein biological function. Here, we show the importance of hydration for protein dynamics and the percolation of hydration water by inelastic neutron scattering and molecular dynamics simulation. The dynamical transition of protein is highly correlated with the percolation transition of the hydration water, and then the percolation induces the protein dynamical transition. The dynamical coupling between protein and hydration water is essential for protein dynamics and its biological function.
Ikeda, Takashi
no journal, ,
no abstracts in English
Agui, Akane; Sakurai, Hiroshi*; Suzuki, Kosuke*
no journal, ,
no abstracts in English
SiKambe, Shinsaku; Sakai, Hironori; Tokunaga, Yo; Lapertot, G.*; Matsuda, Tatsuma*; Flouquet, J.*; Knebel, G.*; Walstedt, R. E.*
no journal, ,
Recently there is renewed interest in quantum critical phase transitions (QCPT) at 
K in metallic strongly-correlated electron systems. From early experimental results, the QCPT in the Kondo-lattice compound YbRhSi is not a case of the ordinary spin density wave (SDW) instability observed in Ce-based Kondo-lattices, but a candidate for a novel locally critical case. In new observations reported here, we find that coexisting, static Fermi liquid (FL) and non-Fermi liquid (NFL) states are a key feature of the QCPT in YbRhSi. Such a pair of states has remained hidden in Ce compounds, owing presumably to short lifetimes for the two states. A new scaling law for the occupation ratio of the two states is derived, and could be widely applicable to Kondo-lattice systems.
(
= Al, Ga)Kaneko, Koji; Kawasaki, Takuro; Nakamura, Ai*; Moyoshi, Taketo*; Munakata, Koji*; Nakao, Akiko*; Hanashima, Takayasu*; Kiyanagi, Ryoji; Ohara, Takashi; Oikawa, Kenichi; et al.
no journal, ,
no abstracts in English
Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi
no journal, ,
no abstracts in English
Sakai, Toru; Nakano, Hiroki*; Okunishi, Koichi*
no journal, ,
The S=1/2 three-leg spin tube is investigated using the large-scale numerical diagonalization up to 42 spins and the level spectroscopy method. The critical ratio of the rung and leg exchange interactions where a quantum phase transition occurs between the gapless and gapped phases is estimated precisely.
Kasahara, Toshihiro*; Hijii, Keigo*; Sakai, Toru
no journal, ,
The spin nanotube with the ring exchange interaction is investigated using the numerical diagonalization. As a result, it is theoretically found that another spin gap phase due to a different singlet dimer configuration from the initial ground state is realised for sufficiently large ring exchange interaction.
Kumada, Takayuki; Akagi, Hiroshi; Itakura, Ryuji; Otobe, Tomohito; Yokoyama, Atsushi
no journal, ,
We observed oscillation of time-resolved reflectivity of femtosecond-laser-ablated polymers. We ascribe the oscillation to the interference between probe pulses reflected from a sample surface and a thin layer produced by the photomechanical effect.
As via inelastic X-ray scatteringMurai, Naoki*; Fukuda, Tatsuo; Uchiyama, Hiroshi*; Tsutsui, Satoshi*; Ishikawa, Daisuke*; Kobayashi, Tatsuya*; Nakamura, Hiroki; Machida, Masahiko; Nakajima, Masamichi*; Miyasaka, Shigeki*; et al.
no journal, ,
no abstracts in English
Matsubara, Akihiro; Fujita, Natsuko; Nishizawa, Akimitsu*; Miyake, Masayasu*
no journal, ,
no abstracts in English
Kubo, Katsunori
no journal, ,
no abstracts in English
Tsutsui, Kenji; Mori, Michiyasu; Toyama, Takami*
no journal, ,
We adapt the numerically exact diagonalization techniques on small clusters of Hubbard model to calculate the Cu L-edge Resonant Inelastic X-ray Scattering Spectra on high-Tc cuprates. We discuss the difference of the spectral weights related to the charge excitations between hole- and electron-doped systems.
Co
)GeTokunaga, Yo; Aoki, Dai*; Mayaffre, H.*; Kr
mer, S.*; Berthier, C.*; Horvati
, M.*; Sakai, Hironori; Kambe, Shinsaku
no journal, ,
The object of this study is to elucidate the interplay between superconductivity and metamagnetism in URhGe. Metamagnetism is in itself quite interesting phenomena, especially in a system with itinerant f-electrons. Unconventional states observed in the vicinity of the metamagnetic transition have been the subject of a number of recent publications. The nature of the metamagnetism becomes particularly important in ferromagnetic superconductors URhGe and UCoGe, since it is likely related to the pairing mechanism for their unconventional superconductivity. Here we report the result of our NMR study on U(RhCo)Ge.
Harries, J.; Iwayama, Hiroshi*; Nagasono, Mitsuru*; Togashi, Tadashi*; Kuma, Susumu*; Nakajima, Kyo*; Shigemasa, Eiji*
no journal, ,
Suzuki, Norihiro*; Nagoshi, Tatsuro*; Yoda, Yumi*; Inoue, Naoki*; Harries, J.; Koike, Fumihiro*; Azuma, Yoshiro*
no journal, ,
Si, 2Sakai, Hironori; Tokunaga, Yo; Kambe, Shinsaku; Matsumoto, Yuji*; Haga, Yoshinori
no journal, ,
Heavy fermion antiferromagnet CeRhSi exhibits antiferromagnetic transition at 
K, which is suppressed by applying pressure. It is known as a pressure induced superconductor around 1 GPa, where the 
becomes close to zero. As followed by the previous presentation, we will report the progress of our 
Si NMR experiments which tell how the antiferromagnetic spin fluctuations develop in this system under pressures.
Harii, Kazuya; Chudo, Hiroyuki; Ono, Masao; Matsuo, Mamoru; Ieda, Junichi; Okayasu, Satoru; Saito, Eiji; Maekawa, Sadamichi
no journal, ,
Recently, the spin-rotation coupling, interaction between spin angular momentum and mechanical rotation, was directly observed by NMR measurements in which a sample and a detector are rotated synchronously. In the measurement, by tilting the rotation axis from an external magnetic filed, we can apply a time-dependent external field on the sample. The time-dependent external field generates Berry phases and the Berry phases can be detected as NMR frequency shifts. We report experimental and theoretical studies of the NMR frequency shifts.
Ota, Yukihiro; Machida, Masahiko; Koyama, Tomio*; Matsumoto, Hideki*
no journal, ,
Superconductivity leads to intriguing and useful devices, owing to its features distinct from the normal electrons. We study terahertz emission from intrinsic Josephson junction stacks in layered High-
cupurate superconductors, with full 3D multi-scale simulations. Typical previous simulations of this issue had the restriction on examining the layer-number dependence of emission spectrum, since a periodic boundary condition along 
-axis inside a superconducting mesa is imposed for brevity. In this article, we develop a method to resolve this theoretical limitation, taking the boundary effects from the electrodes attached to the superconducting mesa into account. The present simulations show an explicit dependence of the emission characteristics on the number of superconducting layers.
Yokota, Terufumi
no journal, ,
no abstracts in English