Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2012-01-05
Phys. Rev. B 85 (2012) 045113
Physics
Condensed Matter
Strongly Correlated Electrons
to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.85.045113
Polycrystalline samples of the isostructural alloys UNi1-xCoxSi2 (0 <= x <= 1) were studied by means of x-ray powder diffraction, magnetization, electrical resistivity and specific heat measurements, at temperatures down to 2 K and in magnetic fields up to 5 T. The experimental data revealed an evolution from strongly anisotropic ferromagnetism with pronounced Kondo effect, observed for the alloys with x < 0.98 and being gradually suppressed with rising Co-content, to spin-glass-like states with dominant spin fluctuations, seen for the sample with x = 0.98. Extrapolation of the value of TC(x) yields a critical concentration xc = 1, at which the magnetic ordering entirely disappears. This finding is in line with preliminary data collected for stoichiometric UCoSi2.
Kaczorowski Dariusz
Pikul Adam P.
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