Evidence for unconventional superconducting fluctuations in heavy-fermion compound CeNi 2Ge 2

S. Kawasaki, T. Sada, T. Miyoshi, H. Kotegawa, H. Mukuda, Y. Kitaoka, T. C. Kobayashi, T. Fukuhara, K. Maezawa, K. M. Itoh, E. E. Haller

研究成果: Article査読

4 被引用数 (Scopus)

抄録

We present evidence for unconventional superconducting fluctuations in a heavy-fermion compound CeNi 2Ge 2. The temperature dependence of the 73Ge 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 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 c onset = 0.2 K and T c 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 2Ge 2.

本文言語English
論文番号043702
ジャーナルJournal of the Physical Society of Japan
75
4
DOI
出版ステータスPublished - 2006 4

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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