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, Kohei M Itoh, E. E. Haller

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Article number043702
JournalJournal of the Physical Society of Japan
Volume75
Issue number4
DOIs
Publication statusPublished - 2006 Apr

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fermions
Fermi liquids
spin-lattice relaxation
nuclear spin
proximity
critical point
superconductivity
signatures
temperature dependence
annealing

Keywords

  • CeNi Ge
  • Heavy fermion
  • NQR
  • Resistance
  • Unconventional superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Kawasaki, S., Sada, T., Miyoshi, T., Kotegawa, H., Mukuda, H., Kitaoka, Y., ... Haller, E. E. (2006). Evidence for unconventional superconducting fluctuations in heavy-fermion compound CeNi 2Ge 2 Journal of the Physical Society of Japan, 75(4), [043702]. https://doi.org/10.1143/JPSJ.75.043702

Evidence for unconventional superconducting fluctuations in heavy-fermion compound CeNi 2Ge 2 . / Kawasaki, S.; Sada, T.; Miyoshi, T.; Kotegawa, H.; Mukuda, H.; Kitaoka, Y.; Kobayashi, T. C.; Fukuhara, T.; Maezawa, K.; Itoh, Kohei M; Haller, E. E.

In: Journal of the Physical Society of Japan, Vol. 75, No. 4, 043702, 04.2006.

Research output: Contribution to journalArticle

Kawasaki, S, Sada, T, Miyoshi, T, Kotegawa, H, Mukuda, H, Kitaoka, Y, Kobayashi, TC, Fukuhara, T, Maezawa, K, Itoh, KM & Haller, EE 2006, 'Evidence for unconventional superconducting fluctuations in heavy-fermion compound CeNi 2Ge 2 ', Journal of the Physical Society of Japan, vol. 75, no. 4, 043702. https://doi.org/10.1143/JPSJ.75.043702
Kawasaki, S. ; Sada, T. ; Miyoshi, T. ; Kotegawa, H. ; Mukuda, H. ; Kitaoka, Y. ; Kobayashi, T. C. ; Fukuhara, T. ; Maezawa, K. ; Itoh, Kohei M ; Haller, E. E. / Evidence for unconventional superconducting fluctuations in heavy-fermion compound CeNi 2Ge 2 In: Journal of the Physical Society of Japan. 2006 ; Vol. 75, No. 4.
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AU - Mukuda, H.

AU - Kitaoka, Y.

AU - Kobayashi, T. C.

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AB - 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.

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