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 2004
Externally publishedYes

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antiferromagnetism
hydrostatic pressure
superconductivity
spin-lattice relaxation
nuclear spin
fermions
expansion
augmentation
excitation

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Exotic superconductivity in the coexistent phase of antiferromagnetism and superconductivity in CeCu2(Si0.98Ge0.02) 2 : A Cu-NQR study under hydrostatic pressure. / Kawasaki, Yu; Ishida, Kenji; Kawasaki, Shinji; Mito, Takeshi; Zheng, Guo-Qing; Kitaoka, Yoshio; Geibel, Christoph; Steglich, Frank.

In: Journal of the Physical Society of Japan, Vol. 73, No. 1, 01.2004, p. 194-197.

Research output: Contribution to journalArticle

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AU - Ishida, Kenji

AU - Kawasaki, Shinji

AU - Mito, Takeshi

AU - Zheng, Guo-Qing

AU - Kitaoka, Yoshio

AU - Geibel, Christoph

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AB - 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.

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