Abstract
Results on electrical resistivity and magnetization of ${\mathrm{TmCo}}_{2}$ intermetallic compound in magnetic fields up to 15 T and in temperature range from 1.5 K to 300 K are presented. In zero magnetic field two well-separated phase transitions are observed at low temperatures: at 3.7 K and at 3.3 K. Magnetoresistivity at temperatures below 3.3 K is negative. However at higher temperatures, magnetoresistivity is positive in a weak field, showing a maximum in the dependence on the magnetic field at ${H}_{\mathrm{max}}.$ ${H}_{\mathrm{max}}$ is found to be proportional to ${T}^{1.5}.$The maximum exists also in the temperature dependence of magnetoresistivity, measured at a constant external field ${H}^{*}.$The results are interpreted in the framework of a model with two different contributions to magnetoresistivity: a negative one, related to the localized $4f$ magnetic moments of Tm, and a positive contribution associated with the features of the Co $3d$ band which are responsible for the itinerant metamagnetism of $R{\mathrm{Co}}_{2}$ compounds. The positive magnetoresistivity arises due to the spin polarization of the Co $3d$ band by the exchange field and enhancement of the spin fluctuations within this band.
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