On the Temperature Dependence of the Electrical Resistivity of Er0.55Y0.45Co2
At low temperatures the electrical resistivity p(T) dependencies for some R1-xYxCo2 (R = Er, Ho, Dy) in the concentration regions 0.2<x<0.7; 0.3<x<0.8 and 0.6<x<0.8, respectively, exhibit a pronounced minimum. The detailed neutron diffraction study performed on Er0.05Y0.45Co2 shows that the behavior of the critical scattering of neutrons with the temperature and in an applied magnetic field correlates with the behavior of the electrical resistivity. The presence of the minimum on the p(T) dependence results from the appearance of localized spin density fluctuations with the decreasing temperature below T = 18K. This temperature can be associated with the magnetic ordering temperature of the R-subsystem (Tc R). An abrupt decrease of the resistivity with the further decrease of the temperature accompanies the appearance of the long range magnetic order in the itinerant d-subsystem at TC Co≈11K.
KeywordsElectrical Resistivity Magnetic State Neutron Diffraction Applied Magnetic Field Bragg Reflection
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