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SiMetoki, Naoto; Kaneko, Koji; Matsuda, Tatsuma; Galatanu, A.; Takeuchi, Tetsuya*; Hashimoto, Shin*; Ueda, Taiki*; Settai, Rikio*; Onuki, Yoshichika; Bernhoeft, N.*
Journal of Physics; Condensed Matter, 16(15), p.L207 - L212, 2004/04
Times Cited Count：92 Percentile：93.35(Physics, Condensed Matter)no abstracts in English
Osakabe, Toyotaka; Soyama, Kazuhiko; Suzuki, Koji*; Miyo, Tatsuya*
Hamon, 14(1), p.84 - 87, 2004/01
The neutron-focusing is an indispensable technical element in the experments under extreme condition with tiny samples. In this article, the development of the thermal neutron focusing device is reported. The device has 18 pieces of the 3Q
NiC/Ti neutron supermirrors with the shape of a circle. The extension of the end of each mirror meets at a focal point (sample position). Neutrons are repeatedly reflected with the same angle by the inner side of the circle and arrive at the sample position. The test results show that the integrated intensity increases by a factor of 2 or more for the neutron wavelength of 2.36AA .
Ga
(=Ni, Pd, Pt)Kaneko, Koji; Metoki, Naoto; Bernhoeft, N.*; Lander, G. H.; Ishii, Yoshinobu; Ikeda, Shugo; Tokiwa, Yoshifumi; Haga, Yoshinori; Onuki, Yoshichika
Physical Review B, 68(21), p.214419_1 - 214419_9, 2003/12
Times Cited Count：59 Percentile：88.45(Materials Science, Multidisciplinary)The crystal structure, lattice strain due to the antiferromagnetic ordering and magnetic form factor in the itinerant 5
compounds UTGa (T: Ni, Pd, Pt) have been studied by neutron scattering. High-resolution powder diffraction revealed that the tetragonality of the U-Ga layers increases with the ionic radius of the transition metal element T. The observed antiferromagnetic reflections can be well explained with the N
el-type structure for UNiGa, whereas UPtGa has the antiferromagnetic stacking of the ferromagnetically ordered uranium moments in the 
-plane. The orbital contributions in the magnetic form factor are reduced from the free ion value, especially for UNiGa. This suppression shows a strong correlation with the bulk magnetic susceptibility. The tetragonality of the U-Ga layers is a sensitive measure of the nearest neighbour interaction, the lattice anomaly, and the orbital contribution and suggests that orbital degrees of freedom may play an important role for the magnetic properties in these itinerant 5 antiferromagnets.
