Magnetic and Electronic Properties of URu sub( 2)Si sub( 2) Revealed by Comparison with Nonmagnetic References ThRu sub( 2)Si sub( 2) and LaRu sub( 2)Si sub( 2)

We have carried out nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements on ... and ..., which are the nonmagnetic references of the intriguing heavy fermion ... The comparisons of ... with the reference materials allow us to analyze the already known NMR and NQR data on ... phenomenologically and semiquantitatively. The study of 101Ru-NQR frequency suggests the relatively close electronic configuration of ..., including the valence of the actinide ion, to that of the tetravalent ThRu2Si2 at high temperatures, as well as the delocalization of 5f electrons at low temperatures. Ising-like spin fluctuations along the c-axis were brought to light by 29Si-NMR data in the so-called hidden order phase of ... The unique magnetic property is plausibly associated with the mechanism of the unconventional superconductivity. (ProQuest: ... denotes formulae/symbols omitted.)