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Effect of Partial Magnetic Order on Resistivity and Thermopower of Ho(Co1−xAlx)2 Alloys
T. Nakama,C. Zukeran,A. Nakamura,A. Teruya,S. Hirakawa,S. Watanabe,Y. Hiranaka,M. Takeda,M. Hedo,K. Yagasaki,Y. Takaesu,K. Uchima,A. T. Burkov 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The electrical resistivity and the thermopower S of Ho(Co1−xAlx)2 alloys (x = 0 to 0.2) weremeasured at temperatures from 2 K to 300 K in magnetic fields up to 10 T. While (T) and S(T)of pure HoCo2 reveal abrupt changes at the magnetic ordering temperature TC, indicating a firstordertransition, the temperature variations of both properties across the ordering temperature inHo(Co1−xAlx)2 alloys clearly show that the type of magnetic transition changes under substitutionof Al for Co from first order to second order around x 0.06. (T) of the Al-substituted samples (x= 0.15 and 0.2) has a very unusual variation at temperatures below TC: in contrast to the expectedand usually-observed decrease of (T), the resistivity of Ho(Co1−xAlx)2 alloys (x = 0.15 and 0.2)increases at temperatures below TC. Moreover, the magnetoresistance of these alloys is positivearound TC; this is also in a sharp contrast to the usually observed negative magnetoresistance. We show that the anomalous resistivity and magnetoresistance in these alloys are related to themetamagnetic instability of the Co 3d subsystem and to the fluctuating local magnetic susceptibilitydue to atomic substitution. Due to this fluctuating local magnetic susceptibility, the uniformexchange field of 4f moments induces a non-uniform polarization of the 3d system, with staticspatial fluctuations of the local magnetization. This static magnetic disorder gives an additionalcontribution (m) to the electrical resistance in the alloys at temperatures below TC. The degreeof this disorder changes with decreasing temperature, resulting in specific variation of m withtemperature.
REVIEW AND FUTURE ISSUES ON SPENT NUCLEAR FUEL STORAGE
T. SAEGUSA,K. SHIRAI,T. ARAI,J. TANI,H. TAKEDA,M. WATARU,A. SASAHARA,P. L. WINSTON 한국원자력학회 2010 Nuclear Engineering and Technology Vol.42 No.3
The safety of metal cask and concrete cask storage technology has been verified by CRIEPI through several research programs on demonstrative testing for the interim storage of spent fuel. The results have been reflected in the safety requirements for dry casks issued by NISA/METI (Nuclear and Industrial Safety Agency, Ministry of Economy, Trade and Industry) of the Japanese government. On top of that, spent fuel integrity has been studied by the Japan Nuclear Energy Safety Organization (JNES). This paper reviews these research programs. Future issues include the long-term integrity of cask components and high burn-up spent fuel.
Intermediate Valence Behavior of Yb2Ni12P7 Studied by Using 31P NMR
T Koyama,K Sugiura,K Ueda,T Mito,T Kohara,R Satoh,K Tsuchiya,T Nakano,N Takeda 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The Yb-based heavy-fermion compound Yb2Ni12P7 with a hexagonal Zr2Fe12P7-type crystalstructure was investigated by using the 31P nuclear magnetic resonance (NMR) technique. Thecomplicated NMR line changes its shape gradually with decreasing temperature, implying the presenceof some Knight shift components. The temperature dependences of the Knight shift and thenuclear spin-lattice relaxation rate 1/T1 suggest the delocalization of 4f electrons.
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.
REVIEW AND FUTURE ISSUES ON SPENT NUCLEAR FUEL STORAGE
Saegusa, T.,Shirai, K.,Arai, T.,Tani, J.,Takeda, H.,Wataru, M.,Sasahara, A.,Winston, P.L. Korean Nuclear Society 2010 Nuclear Engineering and Technology Vol.42 No.3
The safety of metal cask and concrete cask storage technology has been verified by CRIEPI through several research programs on demonstrative testing for the interim storage of spent fuel. The results have been reflected in the safety requirements for dry casks issued by NISA/METI (Nuclear and Industrial Safety Agency, Ministry of Economy, Trade and Industry) of the Japanese government. On top of that, spent fuel integrity has been studied by the Japan Nuclear Energy Safety Organization (JNES). This paper reviews these research programs. Future issues include the long-term integrity of cask components and high burn-up spent fuel.
Tanaka, T.,Abe, K.,Hayato, Y.,Iida, T.,Kameda, J.,Koshio, Y.,Kouzuma, Y.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakayama, S.,Obayashi, Y.,Sekiya, H.,Shiozawa, M.,Suzuki, Y.,Takeda, A.,Takenaga, Y.,Ueno, IOP Publishing 2011 The Astrophysical journal Vol.742 No.2
<P>We present the result of an indirect search for high energy neutrinos from Weakly Interacting Massive Particle (WIMP) annihilation in the Sun using upward-going muon (upmu) events at Super-Kamiokande. Data sets from SKI-SKIII (3109.6 days) were used for the analysis. We looked for an excess of neutrino signal from the Sun as compared with the expected atmospheric neutrino background in three upmu categories: stopping, non-showering, and showering. No significant excess was observed. The 90% C. L. upper limits of upmu flux induced by WIMPs of 100 GeV c(-2) were 6.4 x 10(-15) cm(-2) s(-1) and 4.0 x 10(-15) cm(-2) s(-1) for the soft and hard annihilation channels, respectively. These limits correspond to upper limits of 4.5 x 10(-39) cm(-2) and 2.7 x 10(-40) cm(-2) for spin-dependent WIMP-nucleon scattering cross sections in the soft and hard annihilation channels, respectively.</P>