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Electrical resistivity studies of Cr - Ir alloy single crystals

Electrical resistivity has been measured for four Cr - Ir alloy single crystals for concentrations between 0.07 and 0.25 at.% Ir in the temperature range 4 to 1200 K. Well defined magnetic anomalies were observed at the Néel temperature of each alloy as well as at the incommensurate - commensurate (I - C) spin-density-wave (SDW) phase transition temperature of a Ir alloy. The latter transition is hysteretic, of hysteresis width about 20 K, which is indicative of a first-order ISDW - CSDW phase transition. Analyses of the data show that the fraction of the electron and hole Fermi surface sheets that nests is roughly the same in the ISDW and CSDW phases. A magnetic contribution to the resistivity, amounting to between 20% and 25% of the total resistivity at the Néel point, is observed in the alloys. This contribution, probably due to spin-fluctuation effects, persists to temperatures well above , up to about .