Exotic superconductivity in the coexistent phase of antiferromagnetism and superconductivity in CeCu2(Si0.98Ge0.02) 2: A Cu-NQR study under hydrostatic pressure

Yu Kawasaki, Kenji Ishida, Shinji Kawasaki, Takeshi Mito, Guo Qing Zheng, Yoshio Kitaoka, Christoph Geibel, Frank Steglich

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We report a pressure (P) effect on CeCu2(Si 0.98Ge0.02)2 where an antiferromagnetic (AFM) order at TN ∼ 0.75 K coexists with superconductivity below T c ∼ 0.4 K. At pressures exceeding P = 0.19 GPa, the AFM order is suppressed, which demonstrates that the sudden emergence of AFM order due to the Ge doping is ascribed to the intrinsic lattice expansion. The exotic superconductivity at P = 0 GPa is found to evolve into a typical heavy-fermion one with a line-node gap above P = 0.91 GPa. We highlight that the anomalous enhancement in nuclear spin-lattice relaxation rate 1/T1 that follows a T1T = const. behavior well below Tc at P = 0 GPa is characterized by the persistence of low-lying magnetic excitations, which may be inherent to the coexistent state of antiferromagnetism and superconductivity.

Original languageEnglish
Pages (from-to)194-197
Number of pages4
Journaljournal of the physical society of japan
Volume73
Issue number1
DOIs
Publication statusPublished - Jan 1 2004
Externally publishedYes

Keywords

  • Heavy-fermion superconductivity
  • Impurity effect
  • Nuclear magnetic resonance
  • Pressure effect
  • Quantum critical point

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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