論文

査読有り
2017年10月

Magnetic and superconducting properties of an S-type single-crystal CeCu2Si2 probed by Cu-63 nuclear magnetic resonance and nuclear quadrupole resonance

PHYSICAL REVIEW B
  • Shunsaku Kitagawa
  • ,
  • Takumi Higuchi
  • ,
  • Masahiro Manago
  • ,
  • Takayoshi Yamanaka
  • ,
  • Kenji Ishida
  • ,
  • H. S. Jeevan
  • ,
  • C. Geibel

96
13
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevB.96.134506
出版者・発行元
AMER PHYSICAL SOC

We have performed Cu-63 nuclear-magnetic-resonance/nuclear-quadrupole-resonance measurements to investigate the magnetic and superconducting (SC) properties on a "superconductivity dominant" (S-type) single crystal of CeCu2Si2. Although the development of antiferromagnetic (AFM) fluctuations down to 1 K indicated that the AFM criticality was close, Korringa behavior was observed below 0.8 K, and no magnetic anomaly was observed above Tc similar to 0.6 K. These behaviors were expected in S-type CeCu2Si2. The temperature dependence of the nuclear spin-lattice relaxation rate 1/T-1 at zero field was almost identical to that in the previous polycrystalline samples down to 130 mK, but the temperature dependence deviated downward below 120 mK. In fact, 1/T-1 in the SC state could be fitted with the two-gap s(+/-)-wave model rather than the two-gap s(++)-wave model down to 90 mK. Under magnetic fields, the spin susceptibility in both directions clearly decreased below Tc, which is indicative of the formation of spin-singlet pairing. The residual part of the spin susceptibility was understood by the field-induced residual density of states evaluated from 1/T1T, which was ascribed to the effect of the vortex cores. No magnetic anomaly was observed above the upper critical field H-c2, but the development of AFM fluctuations was observed, indicating that superconductivity was realized in strong AFM fluctuations.

Web of Science ® 被引用回数 : 9

リンク情報
DOI
https://doi.org/10.1103/PhysRevB.96.134506
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000412512900007&DestApp=WOS_CPL
ID情報
  • DOI : 10.1103/PhysRevB.96.134506
  • ISSN : 2469-9950
  • eISSN : 2469-9969
  • Web of Science ID : WOS:000412512900007

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