Electrical resistivity of nickel-rich nickel-chromium alloys between 4 and 300 K

Electrical resistivity of Ni–Cr alloys containing 5.5, 11.3, 15.7, 16.8, 19.4, 22.0, 24.6, and 27.0 at % Cr has been measured as a function of the absolute temperatureT between 4 and 300 K. The sample with the Cr content of 22.0 at % exhibits a small minimum at about 10 K. No minimum has been observed in any other of the above samples, although an anomalousT dependence has been found in alloys containing 15.7, 16.8, and 19.4 at % Cr. The minimum has been discussed from the viewpoint of the Béal-Monod theory for the Kondo effect in concentrated systems and the mechanism by Greig and Rowlands based on aT-dependent decrease of the impurity electrical resistivity. It is concluded that the minimum in the Ni–Cr system is still a phenomenon which is not well understood at the present time.     

Spin-flip transition in the chromium-tungsten system

The magnetic susceptibility χ of polycrystalline Cr and Cr-0.3 at.% W samples has been studied in the neighborhood of the spin-flip transitionT _sf with a relative precision of one part in 10⁴. In pure Cr, χ exhibits a step-type anomaly atT _sf=123.0±0.5 K. The χ behavior of the Cr-0.3 at.% W alloy is different from that of pure Cr: No step anomaly exists, but atT _sf=112.5±0.5 Kdχ/dT shows a sharp minimum.     

Magnetic susceptibility of polycrystalline terbium in the neighborhood of the Néel temperature

The magnetic susceptibility of polycrystalline terbium has been measured near its Néel temperature T _N . It has been found that below T _N the susceptibility diverges logarithmically in |T _N ?T| in good agreement with previous studies by Boyarskii and Starikov. Above T _N no logarithmic divergence is observed.     

Magnetic susceptibility of polycrystalline samarium between 4 and 300 K

Magnetic susceptibility χ of polycrystalline rhombohedral samarium has been measured as a function of temperatureT between 4 and 300 K. The χ vs.T curve exhibits two peaks: a large one at 15 K and a small one at 106 K. The magnetic susceptibility between the Néel temperatureT _N=106 K and 300 K obeys the predictions of the Stewart theory. We also demonstrate hysteretic effects in the magnetic susceptibility aroundT _N and indicate that no significant results on critical indices could be obtained from these measurements.