Evolution of an unconventional superconducting state inside the antiferromagnetic phase of CeNiGe3 under pressure: A 73Ge-nuclear-quadrupole-resonance study

Atsushi Harada, Hidekazu Mukuda, Yoshio Kitaoka, Arumugam Thamizhavel, Yusuke Okuda, Rikio Settai, Yoshichika Onuki, Kouhei M. Itoh, Eugene E. Haller, Hisatomo Harima

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We report a 73Ge nuclear-quadrupole-resonance (NQR) study on novel evolution of unconventional superconductivity in antiferromagnetic (AFM) CeNiGe3. The measurements of the 73Ge-NQR spectrum and the nuclear spin-lattice relaxation rate (1=T1) have revealed that the unconventional superconductivity evolves inside a commensurate AFM phase around the pressure (P) where Néel temperature TN exhibits its maximum at 8.5 K. The superconducting transition temperature TSC has been found to be enhanced with increasing TN, before reaching the quantum critical point at which the AFM order collapses. Above TSC, the AFM structure transits from an incommensurate spin-density-wave order to a commensurate AFM order at T ∼ 2 K, accompanied by a longitudinal spin-density fluctuation. With regard to heavy-fermion compounds, these novel phenomena have hitherto never been reported in the P-T phase diagram.

Original languageEnglish
Article number103710
JournalJournal of the Physical Society of Japan
Volume77
Issue number10
DOIs
Publication statusPublished - 2008 Oct 1

Keywords

  • CeNiGe
  • Commensurate and incommensurate antiferromagnetism
  • Heavy fermion
  • NQR under pressure
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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