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• W2000679305 abstract "We present results of the low-temperature specific heat C of samples of the series $({mathrm{U}}_{x}{mathrm{La}}_{1ensuremath{-}x}{)}_{2}{mathrm{Zn}}_{17},$ combined with measurements of the low-temperature magnetic susceptibility (ensuremath{chi}) and resistivity (ensuremath{rho}). For $x>0.8$ we find antiferromagnetic order in coexistence with heavy-fermion behavior. An extrapolation of ${T}_{N}$ as a function of the uranium concentration implies that ${T}_{N}$ vanishes for $x=0.8;$ at $x=0.8,$ no magnetic order is detected experimentally at temperatures above 0.06 K. The non-Fermi-liquid (NFL) behavior predicted at such a point in the magnetic phase diagram may be observed, but not as clearly as in other systems; some of the behavior is more consistent with spin fluctuations. As the uranium concentration is lowered below $x=0.8,$ C continues to rise in the low-temperature limit, while $ensuremath{chi}ensuremath{propto}{ensuremath{chi}}_{0}ensuremath{-}{mathrm{aT}}^{0.5},$ but C seems to tend towards the behavior of a Fermi liquid with spin fluctuations at the lowest temperatures $(T<0.25mathrm{K}).$ First at $x=0.3$ the temperature dependence of $C/T$ is found to be contrary to Fermi-liquid behavior, while $ensuremath{chi}ensuremath{propto}{ensuremath{chi}}_{0}ensuremath{-}amathrm{log}T.$ Thus non-Fermi-liquid behavior is not found so unambiguously at the concentration where ${T}_{N}$ vanishes as expected by a quantum critical point theory, but rather at lower uranium concentrations. This presents the possibility that NFL behavior in $({mathrm{U}}_{x}{mathrm{La}}_{1ensuremath{-}x}{)}_{2}{mathrm{Zn}}_{17}$ is not due to nearness to a quantum critical point, but rather to disorder or the presence of spin fluctuations." @default.
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• W2000679305 date "2001-07-23" @default.
• W2000679305 modified "2023-09-24" @default.
• W2000679305 title "Magnetism, spin fluctuations, and non-Fermi-liquid behavior in(UxLa1−x)2Zn17" @default.
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• W2000679305 doi "https://doi.org/10.1103/physrevb.64.064413" @default.
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