The interrelations of the atomic structures, electronic structures, electron transport, and magnetic properties for the amorphous V x Si 100−x alloy system have been studied over a wide composition range, 7 x 74, with particular attention paid to their changes across the metal-insulator transition. By analysing the temperature dependence of the conductivity, we concluded that the metal-insulator transition occurs in the composition range 15 < x < 20. Structural studies revealed that the V atom is substituted for the Si atom in the tetrahedrally bonded Si network in the range where x < 10, whereas the local atomic structure resembles that of the VSi 2 intermetallic compound in the range 20 < x < 40. These two local structures are apparently competing with each other in the critical composition range 10 < x < 20. Both XPS valence band spectra and electronic specific heat measurements proved that the density of states at the Fermi level is definitely finite even in the insulating regime, i.e., for x < 15. Both V Lα and Si Kβ SXS measurements showed that the V 3d states appear just below the Fermi level, and hybridize with the Si 3p states. It is also found that the V atom in the insulating regime possesses a localized magnetic moment, and that the magnetic susceptibility gives rise to a Curie-Weiss-like temperature dependence at low temperatures. Finally, the uniqueness of the electron transport properties for the amorphous V x Si 100−x alloys is emphasized by the ρ-γ diagram, in which the metal-insulator transition is shown to occur while the density of states at the Fermi level remains finite.
207The quasi-stationary method developed by Ono et al. 1s generalized to the case of oblique shock propagation, that is, when a sho~k propagates along directions making a finite angle with that of pressure gradient in stratifying media. Two simultaneous differential equations determining the direction and strength of shock are obtained. Its behavior is discussed in detail for polytropic gases. It is characteristic for the oblique propagation that a pattern change, i.e. transition from regular to Mach pattern, occurs ultimately, and a vortex field generates after the passage of the shock. *> This problem is now under consideration by M. Saito, who takes account of ,the effect of the oblique propagation into shock pulses.6l at Florida International University on June 7, 2015 http://ptp.oxfordjournals.org/ Downloaded from *) The case of oblique magnetic shocks is rather complicated. This is now under investigation by Yamazaki et al. in our institute.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.