S. Takagi

Single-site effect in dilute UAl2 systems

Abstract We have investigated dilute UAl 2 systems of Y 1− x U x Al 2 and Sc 1− y U y Al 2 by bulk measurements. In the dilute limit, the similar scaling relations of χ imp (0) and γ between the two systems suggests the existence of a characteristic energy-scale in each system. However, the volume effect is small compared with that in typical Ce Kondo systems.

Development of itinerant-electron antiferromagnetism in the approach to metal–insulator transition in metallic NiS2−xSex as studied by NMR

Abstract From the T-dependences of the Knight shift and 1/T1T of 77 Se NMR, the approach to the metal–insulator transition from the metallic side in NiS2−xSex has been clarified to be characterized by the development of antiferromagnetic spin fluctuation.

Magnetic properties of Ce(Ru1-xPdx)2Si2 solid solutions

Abstract The magnetic phase diagram of the solid solutions of Ce(Ru 1− x Pd x ) 2 Si 2 has been established as a function of the composition from magnetic susceptibility, specific heat and 29 Si NMR measurements. An onset of weak antiferromagnetic (AF) order with T N ≈ 3 K has been found for 0.05 ⩽ x ⩽ 0.20.

Low-Temperature Elastic Properties of Non-Kramers Doublet Compound PrMg3

We have investigated low-temperature elastic properties of PrMg3 with a non-Kramers Γ3 doublet ground state by using ultrasonic measurements under high field up to 18 T down to 20 mK. A softening of the elastic constant (C11–C12)/2 has been observed below 8 K due to the non-magnetic Γ3 doublet possessing electric quadrupole Ou and Ov with Γ3 symmetry and magnetic octupole Txyz with Γ2. This result appreciably is deviated from a theoretical fitting of the quadrupole susceptibility based on the crystal-electric-field levels below 800 mK. Furthermore, the (C11–C12)/2 shows strange magnetic dependence up to 18 T below 1.7 K, which are inconsistent with the theoretical results.

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.

31P NMR studies of CeP

Abstract Extensive 31 P NMR studies on a low-carrier-density system CeP have revealed clearly split several NMR signals depending on the three phases in the ordered state, which are in general accord with peculiar magnetic structures proposed by neutron diffraction measurements. The T - and the H ext -dependences of 1/ T 1 in the paramagnetic state up to 9.2 T have also been measured and are discussed in connection with the behavior of the electrical resistivity.

31P NMR studies of the Knight shift anomaly in (Ce0.50La0.50)P

Abstract Extension of our systematic 31 P NMR studies on both the dense and the dilute (Ce x La 1− x )P to x = 0.50 has revealed that both the lower- and the higher- T transferred hyperfine couplings for 31 P, as deduced from the strongly non-linear Knight shift versus susceptibility plots, vary almost linearly with the Ce concentration, suggesting rather continuous changes in the electronic properties between the dense and the dilute systems.