Abstract
The electrical resistivity, magnetic and low-temperature specific heat measurements, and theoretical calculations for L 1 0 -type MnPd alloy system were carried out in a wide range of composition from 40 to 60% Pd. In the present antiferromagnetic alloy system, the highest Neel temperature T N was observed in the vicinity of 53% Pd concentration, deviating from the equiatomic concentration. This behavior was also conformed by the theoretical calculations for the effective exchange constant J 0 which gives the value of T N . In the temperature dependence of electrical resistivity for the L 1 0 -type MnPd alloys, a characteristic behavior of a hump just below T N was observed, which is associated with the pseudo-gap-type antiferromagnets. In addition, the value of the electronic specific heat coefficient γ e is significantly small below 1 mJ mol -1 K -2 above 50% Pd, reflecting the very low density of states at the Fermi energy E F . The linear relation between the magnetic moment and the Pauling valence ha...
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