Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-03-09
J. Phys. Soc. Jpn. 75, 043702 (2006).
Physics
Condensed Matter
Strongly Correlated Electrons
4pages,5figures,to appear in J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.75.043702
We present evidence for unconventional superconducting fluctuations in a heavy-fermion compound CeNi$_2$Ge$_2$. The temperature dependence of the $^{73}$Ge nuclear-spin-lattice-relaxation rate $1/T_1$ indicates the development of magnetic correlations and the formation of a Fermi-liquid state at temperatures lower than $T_{\rm FL}=0.4$ K, where $1/T_1T$ is constant. The resistance and $1/T_1T$ measured on an as-grown sample decrease below $T_{\rm c}^{\rm onset} = 0.2$ K and $T_{\rm c}^{\rm NQR} = 0.1$ K, respectively; these are indicative of the onset of superconductivity. However, after annealing the sample to improve its quality, these superconducting signatures disappear. These results are consistent with the emergence of unconventional superconducting fluctuations in close proximity to a quantum critical point from the superconducting to the normal phase in CeNi$_2$Ge$_2$.
Fukuhara Takayasu
Haller Elmar
Itoh Kohei M.
Kawasaki Shigeo
Kitaoka Yoshio
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