Exotic superconducting phase in CeCu2Si2 close to antiferromagnetism: A Cu-NQR study under hydrostatic pressure

Y. Kawasaki, K. Ishida, T. Mito, C. Thessieu, G. Zheng, Y. Kitaoka, C. Geibel, F. Steglich

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Abstract

We report Cu nuclear-quadrupole-resonance results under pressure (P) on a homogeneous CeCu2Si2 (Tc=0.65 K) that revealed critical magnetic fluctuations at the border to an antiferromagnetic (AF) phase. This exotic superconducting (SC) phase evolves into the typical heavy-fermion SC phase at minute pressures exceeding Pc∼0.2 GPa. The nuclear spin-lattice relaxation data in a P range 0.85 - 2.58 GPa are shown to be accountable by the spin-fluctuation theory based on the nearly AF Fermi-liquid model. In 0≤P< Pc∼0.2 GPa, by contrast, we conclude that the exotic SC phase manifests itself under the unconventional normal state where AF waves propagate over a long range without any trace of AF order and thereby the heavy-fermion state breaks up.

Original languageEnglish
Article number140501
Pages (from-to)1405011-1405014
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number14
Publication statusPublished - Jan 1 2001

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Kawasaki, Y., Ishida, K., Mito, T., Thessieu, C., Zheng, G., Kitaoka, Y., Geibel, C., & Steglich, F. (2001). Exotic superconducting phase in CeCu2Si2 close to antiferromagnetism: A Cu-NQR study under hydrostatic pressure. Physical Review B - Condensed Matter and Materials Physics, 63(14), 1405011-1405014. [140501].