Naoyuki Tateiwa

Strong correlation between magnetism and superconductivity in a single crystalline UNi2Al3 and UPd2Al3

Abstract The anisotropy of upper critical magnetic fields is remarkably different between UPd 2 Al 3 and UNi 2 Al 3 . The low-energy excitations observed in inelastic neutron scattering experiments of UPd 2 Al 3 are suggested to be those associated with nodes of a gap function. The temperature dependence of the magnetic Bragg peak intensity in UNi 2 Al 3 shows coupling between antiferromagnetism and superconductivity.

MAGNETIC PROPERTIES OF R3PD20GE6 (R = PR AND ND)

Abstract We have succeeded in growing single crystals of new ternary compounds R 3 Pd 20 Ge 6 (R=Pr and Nd). The magnetic properties of R 3 Pd 20 Ge 6 (R=Pr and Nd) can be basically understood on the basis of the localized 4f-electron model. The magnetic phase diagram of Nd 3 Pd 20 Ge 6 consists of at least two antiferromagnetic phases II and III. The antiferromagnetic orderings of Nd 3 Pd 20 Ge 6 occur on the two R sites independently.

Single crystal growth and physical properties of ternary uranium compounds UM2Al10 (M=Fe, Ru and Os)

We investigated the ternary uranium compounds UM2Al10 (M = Fe, Ru and Os) with the orthorhombic YbFe2Al10-type crystal structure. URu2Al10 and UOs2Al10 are new compounds grown for the first time. These compounds show no ordering despite the Curie -Weiss behavior at high temperatures. The temperature dependence of the electrical resistivity, the specific heat and the magnetic susceptibility indicate that UM2Al10 (M = Fe, Ru and Os) has non-magnetic ground states.

Evidence from NMR of the importance of the hybridization between 5f and conduction electrons in U3Pd20Si6

Abstract The microscopic magnetic properties of U3Pd20Si6 have been investigated by 29 Si NMR. The deduced strongly T-dependent, large relaxation rate of U 5f moments indicates that single-site dynamics due to hybridization between 5f and conduction electrons dominate the low-energy spin dynamics in the paramagnetic state.