Abstract
The site preference of Ir, the temperature dependence of magnetic susceptibility and thelow-temperature specific heat of β-Mn1−xIrxalloys have been investigated. In Mn1−xIrx alloys, theβ-phase existsbelow x = 0.102.From x-ray diffraction patterns, almost all Ir atoms aresubstituted at site 1 in the β-Mnlattice. The electronic specific heat coefficient γ is proportional to the Néeltemperature TN inthe form TN3/4in regions of low-Ir concentration. With increasingx, however, the gradualdecrease in γ leads toa relative increase in γfrom the straight line. Therefore, it is concluded that the magneticstate of the β-Mn1−xIrxalloys varies from a weak itinerant-electron antiferromagnet to an intermediateantiferromagnet with increasing Ir concentration. The point to observe is that the γ versusTN3/4plots give a universal line for all the β-Mnalloy systems over the entire concentration range.
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