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Phase Diagram and Transport Properties of Y1−xNdxCo2 Pseudo-binary Alloys
A. T. Burkov,M. Takeda,A. Teruya,S. Watanabe,Y. Hiranaka,A. Nakamura,M. Hedo,T. Nakama,K. Yagasaki,Y. Takaesu,K. Uchima,Y. Uwatoko 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The electrical resistivity and the thermopower S of pseudo-binary Y1−xNdxCo2 alloys have beenmeasured at temperatures from 2 to 300 K under pressures up to 3.5 GPa. NdCo2 is a ferromagnetwith a Curie temperature TC of 98 K. In the ferromagnetic phase, it undergoes a 4f spin-reorientationtransition at TR = 40 K. At this transition, the easy direction of 4f magnetization is changed from[100] at temperatures above TR to [110] below TR. The system phase diagram TC(x, P) and TR(x, P)is inferred from the temperature dependencies of the electrical resistivity and the thermopower. The Curie temperature of the alloys, TC decreases with decreasing Nd concentration x and vanishesaround xc = 0.3. Above xc, the Curie temperature decreases with increasing pressure. The spinreorientationtemperature weakly depends on the composition and on the pressure until it mergeswith TC. There is a large region of the phase diagram, partly overlapping with the ferromagneticphase, where the cobalt 3d electron system is non-uniformly magnetized due to spatial fluctuationsof the 4f-3d exchange field related to a random distribution of Nd 4f magnetic moments over the Rsublattice. In this region, large static 3d magnetic fluctuations govern the electronic transport.
Recent progress in Large Helical Device experiments
Akio Komori,T. Shimozuma,T. Ido,T. Kobuchi,T. Seki,T. Ozaki,T. Fujita,T. Watari,T. Akiyama,T. Tokuzawa,T. Uda,T. Minami,Y. Nakamura,Y. Torii,Y. Sakamoto,Y. Takeiri,Y. Nagayama,Y. Oka,Y. Narushima,Y. Y 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
In the Large Helical Device (LHD), some reactor-oriented experiments, i.e. high beta, high ion temperature, steady state operation, have produced remarkable progress in recent experimental campaigns. By optimizing the rotational transform, an average beta value of 4.3 %, which is the highest on record for helical devices, was achieved. The ICRF sustained steady-state discharges for more than 30 minutes, these were also successfully performed with the aid of the magnetic axis swing technique for the reduction of the heat load to the plasma-facing component. In the discharge, the total input energy to the plasma reached 1.3 GJ, which also established a new record.1
an effective approach to electron-atom/molecule collision study
Nakamura, Y. The Korean Institute of Electrical and Electronic 1995 電氣電子材料學會誌 Vol.8 No.6
Electron swarm studies to derive electron collision cross sections of atoms and molecules from measurements of electron swarm data are reviewed. Stress is placed on those using molecular gas-rare gas mixtures.
Optical anisotropy and diamagnetic energy shifts in InP-GaP lateral quantum wells
Shin, Y.H.,Kim, Yongmin,Song, J.D.,Lee, Y.T.,Saito, H.,Nakamura, D.,Matsuda, Y.H.,Takeyama, S. Elsevier 2014 Journal of luminescence Vol.151 No.-
Linearly polarized photoluminescence (PL) measurements were made from InP-GaP lateral multiple quantum wells induced by composition modulation along the lateral direction. At B=0, two prominent emission peaks emerged, which are identified as transitions from In-rich well and Ga-rich barrier. regions. Both transitions are strongly linear polarized parallel to the [110] crystal direction. While rotating PL orientation from [110] to [1-10] direction, the well and barrier transitions show red- and blue-shifts, respectively, due to the different valence states. In high magnetic fields, the two peaks exhibit different diamagnetic energy shifts mainly because of the effective-mass difference in the In-rich and Ga-rich alternate regions along the lateral direction. (C) 2014 Elsevier B.V. All rights reserved.
Invariant Mass Spectroscopy for the Neutron Rich Nuclei
Satou, Y.,Tshoo, K.,Bhang, H. C.,Choi, S. H.,Nakamura, T.,Kondo, Y.,Nakayama, Y.,Kobayashi, N.,Tanaka, K. N.,Deguchi, S.,Kawada, Y.,Tanaka, N.,Sugimoto, T.,Motobayashi, T.,Sakurai, H.,Otsu, H.,Aoi, N. Korean Physical Society 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.2
Extension of the operational regime of the LHD towards a deuterium experiment
Takeiri, Y.,Morisaki, T.,Osakabe, M.,Yokoyama, M.,Sakakibara, S.,Takahashi, H.,Nakamura, Y.,Oishi, T.,Motojima, G.,Murakami, S.,Ito, K.,Ejiri, A.,Imagawa, S.,Inagaki, S.,Isobe, M.,Kubo, S.,Masamune, S IOP 2017 Nuclear fusion. Fusion nucléaire. &n.Illiga Vol.57 No.10
<P>As the finalization of a hydrogen experiment towards the deuterium phase, the exploration of the best performance of hydrogen plasma was intensively performed in the large helical device. High ion and electron temperatures, <I>T</I> <SUB>i</SUB> and <I>T</I> <SUB>e</SUB>, of more than 6 keV were simultaneously achieved by superimposing high-power electron cyclotron resonance heating onneutral beam injection (NBI) heated plasma. Although flattening of the ion temperature profile in the core region was observed during the discharges, one could avoid degradation by increasing the electron density. Another key parameter to present plasma performance is an averaged beta value <img ALIGN='MIDDLE' ALT='$\left\langle \beta \right\rangle $ ' SRC='http://ej.iop.org/images/0029-5515/57/10/102023/nfaa7fc2ieqn001.gif'/>. The high <img ALIGN='MIDDLE' ALT='$\left\langle \beta \right\rangle $ ' SRC='http://ej.iop.org/images/0029-5515/57/10/102023/nfaa7fc2ieqn002.gif'/> regime around 4% was extended to an order of magnitude lower than the earlier collisional regime. Impurity behaviour in hydrogen discharges with NBI heating was also classified with a wide range of edge plasma parameters. The existence of a no impurity accumulation regime, where the high performance plasma is maintained with high power heating >10 MW, was identified. Wide parameter scan experiments suggest that the toroidal rotation and the turbulence are the candidates for expelling impurities from the core region.</P>
Invariant Mass Spectroscopy of 23O via the (p, p′) Reaction in Inverse Kinematics
Satou, Y.,Tshoo, K.,Bhang, H.,Choi, S.,Hwang, J. W.,Nakamura, T.,Kondo, Y.,Nakayama, Y.,Kobayashi, N.,Tanaka, K. N.,Deguchi, S.,Kawada, Y.,Tanaka, N.,Motobayashi, T.,Sakurai, H.,Otsu, H.,Aoi, N.,Takeu Springer-Verlag 2013 Few-body systems Vol.54 No.1