Magnetic Susceptibilities of Mo-Tc Binary Alloys

Abstract

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.

Local Class Field Theory: Perfect Residue Field Case

“…t We would note however, that the variation of the room temperature susceptibility, which is also expected to be proportional N(EF) (strictly it is the Pauli spin susceptibility which is proportional to N(E,), but since the diamagnetic and orbital contributions to the total susceptibility may be expected to roughly cancel(Isaacs and Lam 1970) the measured susceptibility will be largely dictated by zPauli) only loosely follows this simple model with the most serious discrepancies occurring for the Tc-MO and Tc-V systems where x actually decreases with decreasing z across the HCP solid solution region(Lam et a / 1964. Van Ostenberg rt al 1962).…”