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Journal Articles

Anisotropic spin fluctuations in the heavy fermion systems; Case studies of CePd$$_5$$Al$$_2$$ and NpPd$$_5$$Al$$_2$$

Sakai, Hironori; Chudo, Hiroyuki; Tokunaga, Yo; Kambe, Shinsaku; Haga, Yoshinori; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*; Homma, Yoshiya*; Aoki, Dai*; et al.

Journal of the Physical Society of Japan, 81(Suppl.B), p.SB003_1 - SB003_6, 2012/12

 Times Cited Count:7 Percentile:46.8(Physics, Multidisciplinary)

In the so-called 115 family members with chemical formulae of Ce$$T$$In$$_5$$ ($$T$$=Co, Rh, Ir) and $$An$$$$T$$Ga$$_5$$ ($$An$$=U, Np, Pu), our analysis of the Knight shift and spin-lattice relaxation rates suggests that larger XY-type anisotropy in the antiferromagnetic spin fluctuations in the normal states would favor $$d$$-wave superconductivity with higher $$T_c$$. In order to examine this working hypothesis, the anisotropy ratios of antiferromagnetic fluctuations are derived from our NMR results for the superconductor NpPd$$_5$$Al$$_2$$ and antiferromagnet CePd$$_5$$Al$$_2$$, which are tetragonal compounds with a 115-related structure. CePd$$_5$$Al$$_2$$ shows Ising-type anisotropy, which is the same anisotropy as in the ordered state. On the other hand, NpPd$$_5$$Al$$_2$$ shows XY-type anisotropy just above $$T_c$$.

Journal Articles

$$^{105}$$Pd NQR study on NpPd$$_5$$Al$$_2$$ and CePd$$_5$$Al$$_2$$

Chudo, Hiroyuki; Sakai, Hironori; Tokunaga, Yo; Kambe, Shinsaku; Aoki, Dai*; Haga, Yoshinori; Matsuda, Tatsuma; Homma, Yoshiya*; Nakano, Yasunori*; Honda, Fuminori*; et al.

Journal of Physics; Conference Series, 200, p.012020_1 - 012020_4, 2010/02

 Times Cited Count:3 Percentile:74.38

We report the results of $$^{105}$$Pd NQR experiments on NpPd$$_5$$Al$$_2$$ and CePd$$_5$$Al$$_2$$. In the normal state at 6 K, the $$^{105}$$Pd NQR spectrum consists of four lines in both systems. These lines can be assigned to two sets of $$pm1/2leftrightarrowpm3/2$$ and $$pm3/2leftrightarrowpm5/2$$ NQR transitions arising from two crystallographically in equivalent Pd sites. From the analysis of the $$^{105}$$Pd NQR spectrum the nuclear quadrupole frequency $$nu_Q$$, asymmetry parameter $$eta$$ and electric field gradient $$V_{zz}$$ have been deduced.

Journal Articles

Numerical assessment of the influence of topographic and climatic perturbations on groundwater flow conditions

Saegusa, Hiromitsu; Yasue, Kenichi; Onoe, Hironori; Moriya, Toshifumi*; Nakano, Katsushi

Stability and Buffering Capacity of the Geosphere for Long-term Isolation of Radioactive Waste; Application to Crystalline Rock, p.257 - 267, 2009/03

In the study, simulations of landform development and groundwater flow have been carried out in the Tono area in order to provide a method to evaluate the effects of long term topographic and climatic changes on groundwater flow conditions. Results of the simulations show the influence of the topographic and climatic perturbations on hydraulic gradient and groundwater velocity. In particular, the influence on hydraulic gradient downstream of the faults normal to the major direction of groundwater flow is much smaller than in the area upstream of the faults. Through this study, it has been confirmed that the method of combining simulations of landform development with groundwater flow is useful for the evaluation of effects of topographic and climatic perturbations on groundwater flow conditions.

JAEA Reports

Basic approach to solute transport analysis utilizing information from surface-based investigations at two generic underground research laboratories

Maekawa, Keisuke; Sawada, Atsushi; Ota, Kunio; Kurikami, Hiroshi; Kunimaru, Takanori; Funaki, Hironori; Hama, Katsuhiro; Takeuchi, Shinji; Amano, Kenji; Saegusa, Hiromitsu; et al.

JAEA-Review 2007-011, 8 Pages, 2007/03

JAEA-Review-2007-011.pdf:0.66MB

In the current programme for research and development on the technical aspects of geological disposal, it is of significance to establish techniques for evaluating solute transport with a direct link to surface-based investigations through the processes of data interpretation, modelling and parameter designation within the immediate five years following the H17 Project. This report presents a basic approach to promoting multidisciplinary research activities involving field investigations and relevant solute transport analysis.

Oral presentation

NMR study of CePd$$_5$$Al$$_2$$

Sakai, Hironori; Chudo, Hiroyuki; Tokunaga, Yo; Kambe, Shinsaku; Yasuoka, Hiroshi; Matsuda, Tatsuma; Yamamoto, Etsuji; Haga, Yoshinori; Nakano, Yasunori*; Honda, Fuminori*; et al.

no journal, , 

Antiferromagnet CePd$$_5$$Al$$_2$$ crystalizes in the tetragonal ZrNi$$_2$$Al$$_5$$-type structure, which is same as a recently discovered superconductor NpPd$$_5$$Al$$_2$$. The magnetic anisotropy along $$c$$ axis of CePd$$_5$$Al$$_2$$ is contrast to that of NpPd$$_5$$Al$$_2$$, We are now performing the NMR study for this compound in order to clarify the spin fluctuations and magnetic ordering. In the talk, we will present the recent NMR data, and discuss in detail.

Oral presentation

Analysis of materials about radiation provided to residents after the Fukushima accident and considerations of a method to evaluate; The Efforts of SG1

Kono, Takahiko; Hattori, Takatoshi*; Yokoyama, Sumi*; Nakano, Hironori*; Sato, Noriko*; Kudo, Hiromi*; Nomura, Naoki*; Sakoda, Akihiro; Naito, Wataru*; Kuroda, Yujiro*; et al.

no journal, , 

no abstracts in English

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