High pressure NQR measurement in CeCu2Si2 up to sudden disappearance of superconductivity

Kenji Fujiwara, Yoshiki Hata, Keigo Kobayashi, Kiyotaka Miyoshi, Jun Takeuchi, Yoshiyuki Shimaoka, Hisashi Kotegawa, Tatsuo C. Kobayashi, Christoph Geibel, Frank Steglich

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56 Citations (Scopus)

Abstract

We report the results of 63Cu nuclear quadrupole resonance (NQR) measurements on CeCu2Si2 under high pressures up to 4.8 GPa. Enhanced spin fluctuations due to quantum criticality at ambient pressure are drastically suppressed with increasing pressure, whereas Tc increases from 0.7 K at ambient pressure to 1.64 K at 4.2 GPa. We have found that bulk superconductivity suddenly disappears at 4.8 GPa accompanied with a rapid decrease in the density of states at the Fermi level. The nuclear spin-lattice relaxation rate 1/T1 at 4.2 GPa reveals that anisotropic superconductivity in the strong-coupling regime is realized even under high pressure far from the antiferromagnetic critical point. Superconductivity under high pressure is unconventional in origin, but the spin fluctuation scenario is not likely to be applicable.

Original languageEnglish
Article number123711
Journaljournal of the physical society of japan
Volume77
Issue number12
DOIs
Publication statusPublished - Dec 1 2008

Keywords

  • CeCuSi
  • High pressure
  • NQR
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Fujiwara, K., Hata, Y., Kobayashi, K., Miyoshi, K., Takeuchi, J., Shimaoka, Y., Kotegawa, H., Kobayashi, T. C., Geibel, C., & Steglich, F. (2008). High pressure NQR measurement in CeCu2Si2 up to sudden disappearance of superconductivity. journal of the physical society of japan, 77(12), [123711]. https://doi.org/10.1143/JPSJ.77.123711