D. O. van Ostenburg

Preasymptotic form of impurity screening in a metal

Abstract An R-4 correction term to Friedels asymptotic form (∼R-3) for the screening around an impurity atom in a free electron metal has been derived. It is found to lead to significant changes in the electric field at the first few neighboring shells.

NMR evidence for localized moments in CoAl

Abstract The temperature dependence of the nuclear T 1 of 27 Al in CoAl shows a deviation from the Korringa relation. According to the work of Giovannini and Heeger this is suggestive of the presence of localized magnetic moments.

Nuclear-spin-lattice relaxation of 51V in V-Fe Alloys☆

Abstract The 51 V nuclear T 1 has been measured up to V-40 at.% Fe. The composition dependence of the relaxation rate closely resembles the term linear in temperature in the low temperature specific heat and shows a second peak near 34 at.% Fe.

Magnetic Susceptibilities of Mo‐Tc Binary Alloys

Magnetic susceptibilities of binary Mo‐Tc alloys have been measured in the temperature range from 300°K to the superconducting transition temperature. The room‐temperature magnetic susceptibility increases from pure Mo (82.5×10−6 emu/g‐atom) to a small maximum (96.5×10−6 emu/g‐atom) at the equiatomic composition. Further additions of Tc produce a decrease which reaches a minimum at 70 at. % Tc (χ=87.3×10−6 emu/g‐atom). Beyond this composition there is another increase to the value of 120.8×10−6 emu/g‐atom for the pure Tc. No Curie or Curie—Weiss type of temperature dependence of the susceptibility was observed in all the alloys in the temperature range investigated. The results are discussed in relation to the band theory of metals and some generalizations about the d‐band form of the three transition metal series having the same electron concentrations are made.