Exotic magnetic and superconducting phases in CeCu2 Si 2 close to magnetically ordered state: Cu-NQR study

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

Research output: Contribution to journalArticle

Abstract

We report Cu-NQR results under pressure on heavy-fermion (HF) superconductor CeCu2Si2 close to a magnetic phase, Ce 0.99Cu2.02Si2 and CeCu2(Si 0.98Ge0.02)2. It is found that an application of a minute pressure exceeding 0.3 GPa markedly suppresses low-energy magnetic fluctuations observed at ambient pressure (P = 0) in Ce0.99Cu 2.02Si2. Correspondingly, anomalous superconducting (SC) characteristics evolve into conventional HF-SC ones with increasing pressure. In the latter, the Ge substitution works as a negative chemical pressure. CeCu2(Si0.98Ge0.02)2 reveals a magnetic phase transition at TN= 0.75 K followed by the SC phase transition at Tc ∼ 0.4 K at P = 0. It is suggested experimentally that the magnetic fluctuations seen in Ce0.99Cu 2.02Si2 at P = 0 possesses a quantum critical character of both SC and magnetically ordered states.

Original languageEnglish
Pages (from-to)374-375
Number of pages2
JournalJournal of Magnetism and Magnetic Materials
Volume226-230
Issue numberPART I
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

Phase transitions
Heavy fermion superconductors
heavy fermion superconductors
Fermions
Substitution reactions
fermions
substitutes
energy

Keywords

  • Heavy-fermion compounds
  • NMR
  • Pressure effect
  • Superconductivity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Kawasaki, Y., Obinata, K., Ishida, K., Mito, T., Zheng, G-Q., Kitaoka, Y., ... Steglich, F. (2001). Exotic magnetic and superconducting phases in CeCu2 Si 2 close to magnetically ordered state: Cu-NQR study. Journal of Magnetism and Magnetic Materials, 226-230(PART I), 374-375.

Exotic magnetic and superconducting phases in CeCu2 Si 2 close to magnetically ordered state : Cu-NQR study. / Kawasaki, Y.; Obinata, K.; Ishida, K.; Mito, T.; Zheng, Guo-Qing; Kitaoka, Y.; Geibel, C.; Steglich, F.

In: Journal of Magnetism and Magnetic Materials, Vol. 226-230, No. PART I, 2001, p. 374-375.

Research output: Contribution to journalArticle

Kawasaki, Y, Obinata, K, Ishida, K, Mito, T, Zheng, G-Q, Kitaoka, Y, Geibel, C & Steglich, F 2001, 'Exotic magnetic and superconducting phases in CeCu2 Si 2 close to magnetically ordered state: Cu-NQR study', Journal of Magnetism and Magnetic Materials, vol. 226-230, no. PART I, pp. 374-375.
Kawasaki, Y. ; Obinata, K. ; Ishida, K. ; Mito, T. ; Zheng, Guo-Qing ; Kitaoka, Y. ; Geibel, C. ; Steglich, F. / Exotic magnetic and superconducting phases in CeCu2 Si 2 close to magnetically ordered state : Cu-NQR study. In: Journal of Magnetism and Magnetic Materials. 2001 ; Vol. 226-230, No. PART I. pp. 374-375.
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T2 - Cu-NQR study

AU - Kawasaki, Y.

AU - Obinata, K.

AU - Ishida, K.

AU - Mito, T.

AU - Zheng, Guo-Qing

AU - Kitaoka, Y.

AU - Geibel, C.

AU - Steglich, F.

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N2 - We report Cu-NQR results under pressure on heavy-fermion (HF) superconductor CeCu2Si2 close to a magnetic phase, Ce 0.99Cu2.02Si2 and CeCu2(Si 0.98Ge0.02)2. It is found that an application of a minute pressure exceeding 0.3 GPa markedly suppresses low-energy magnetic fluctuations observed at ambient pressure (P = 0) in Ce0.99Cu 2.02Si2. Correspondingly, anomalous superconducting (SC) characteristics evolve into conventional HF-SC ones with increasing pressure. In the latter, the Ge substitution works as a negative chemical pressure. CeCu2(Si0.98Ge0.02)2 reveals a magnetic phase transition at TN= 0.75 K followed by the SC phase transition at Tc ∼ 0.4 K at P = 0. It is suggested experimentally that the magnetic fluctuations seen in Ce0.99Cu 2.02Si2 at P = 0 possesses a quantum critical character of both SC and magnetically ordered states.

AB - We report Cu-NQR results under pressure on heavy-fermion (HF) superconductor CeCu2Si2 close to a magnetic phase, Ce 0.99Cu2.02Si2 and CeCu2(Si 0.98Ge0.02)2. It is found that an application of a minute pressure exceeding 0.3 GPa markedly suppresses low-energy magnetic fluctuations observed at ambient pressure (P = 0) in Ce0.99Cu 2.02Si2. Correspondingly, anomalous superconducting (SC) characteristics evolve into conventional HF-SC ones with increasing pressure. In the latter, the Ge substitution works as a negative chemical pressure. CeCu2(Si0.98Ge0.02)2 reveals a magnetic phase transition at TN= 0.75 K followed by the SC phase transition at Tc ∼ 0.4 K at P = 0. It is suggested experimentally that the magnetic fluctuations seen in Ce0.99Cu 2.02Si2 at P = 0 possesses a quantum critical character of both SC and magnetically ordered states.

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