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

Y. Kawasaki, K. Ishida, T. Mito, C. Thessieu, Guo-Qing Zheng, Y. Kitaoka, C. Geibel, F. Steglich

Research output: Contribution to journalArticle

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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 - 2001
Externally publishedYes

Fingerprint

Antiferromagnetism
Fermions
antiferromagnetism
Hydrostatic pressure
hydrostatic pressure
fermions
Nuclear quadrupole resonance
Fermi liquids
Spin fluctuations
fluctuation theory
nuclear quadrupole resonance
Spin-lattice relaxation
borders
spin-lattice relaxation
nuclear spin

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Kawasaki, Y., Ishida, K., Mito, T., Thessieu, C., Zheng, G-Q., Kitaoka, Y., ... 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].

Exotic superconducting phase in CeCu2Si2 close to antiferromagnetism : A Cu-NQR study under hydrostatic pressure. / Kawasaki, Y.; Ishida, K.; Mito, T.; Thessieu, C.; Zheng, Guo-Qing; Kitaoka, Y.; Geibel, C.; Steglich, F.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 63, No. 14, 140501, 2001, p. 1405011-1405014.

Research output: Contribution to journalArticle

Kawasaki, Y, Ishida, K, Mito, T, Thessieu, C, Zheng, G-Q, 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, vol. 63, no. 14, 140501, pp. 1405011-1405014.
Kawasaki, Y. ; Ishida, K. ; Mito, T. ; Thessieu, C. ; Zheng, Guo-Qing ; Kitaoka, Y. ; Geibel, C. ; Steglich, F. / Exotic superconducting phase in CeCu2Si2 close to antiferromagnetism : A Cu-NQR study under hydrostatic pressure. In: Physical Review B - Condensed Matter and Materials Physics. 2001 ; Vol. 63, No. 14. pp. 1405011-1405014.
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