NMR study in novel superconductors

Heavy-fermion system and high-Tc cuprate

Y. Kitaoka, K. Ishida, Guo-Qing Zheng, H. Tou, K. Magishi, S. Matsumoto, K. Yamazoe, H. Yamanaka, K. Asayama

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

From the NMR and NQR studies, we show the unconventional superconducting properties in the antiferromagnetic (AF) heavy-fermion (HF), UPd2Al3 and high-Tc cuprate systems. In UPd2Al3 with TN = 14.5 K and Tc = 2 K, the superconductivity is shown to be of d-wave pairing type with lines of vanishing gap on the Fermi surface. The potential scattering associated with some defects at the Al site is the cause for the Tc suppression and the appearance of the density of states (DOS) at the Fermi level. This unusual impurity effect is consistent with a d-wave scenario, because the potential scattering leads to a gap opening for an anisotropic s-wave scenario. In high-Tc cuprate which are argued to be either a d-wave or an anisotropic s-wave, the potential scatterer like Zn in the plane induces the gapless superconductivity as well, which can not be interpreted in terms of an anisotropic s-wave scenario if the order parameter does not change sign largely. It is shown from the NMR experiment at the Al site for Al-doped La1.85Sr0.15CuO4 that local moments at near neighbor Cu sites induced around Al impurity do not play a role to suppress the Tc and to induce the DOS at all. The NMR studies in novel superconductors have provided important clues to identify their symmetry of order parameter to be d-wave.

Original languageEnglish
Pages (from-to)1931-1935
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Volume56
Issue number12
Publication statusPublished - Dec 1995
Externally publishedYes

Fingerprint

Heavy fermion superconductors
heavy fermion systems
cuprates
Nuclear magnetic resonance
nuclear magnetic resonance
Superconductivity
superconductivity
scattering
Scattering
Impurities
impurities
Fermi surface
Fermions
Fermi level
Superconducting materials
Fermi surfaces
fermions
retarding
moments
Defects

Keywords

  • d-wave superconductivity
  • heavy fermion system
  • high-T cuprate
  • NMR
  • NQR

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)
  • Chemistry(all)
  • Electronic, Optical and Magnetic Materials

Cite this

Kitaoka, Y., Ishida, K., Zheng, G-Q., Tou, H., Magishi, K., Matsumoto, S., ... Asayama, K. (1995). NMR study in novel superconductors: Heavy-fermion system and high-Tc cuprate. Journal of Physics and Chemistry of Solids, 56(12), 1931-1935.

NMR study in novel superconductors : Heavy-fermion system and high-Tc cuprate. / Kitaoka, Y.; Ishida, K.; Zheng, Guo-Qing; Tou, H.; Magishi, K.; Matsumoto, S.; Yamazoe, K.; Yamanaka, H.; Asayama, K.

In: Journal of Physics and Chemistry of Solids, Vol. 56, No. 12, 12.1995, p. 1931-1935.

Research output: Contribution to journalArticle

Kitaoka, Y, Ishida, K, Zheng, G-Q, Tou, H, Magishi, K, Matsumoto, S, Yamazoe, K, Yamanaka, H & Asayama, K 1995, 'NMR study in novel superconductors: Heavy-fermion system and high-Tc cuprate', Journal of Physics and Chemistry of Solids, vol. 56, no. 12, pp. 1931-1935.
Kitaoka Y, Ishida K, Zheng G-Q, Tou H, Magishi K, Matsumoto S et al. NMR study in novel superconductors: Heavy-fermion system and high-Tc cuprate. Journal of Physics and Chemistry of Solids. 1995 Dec;56(12):1931-1935.
Kitaoka, Y. ; Ishida, K. ; Zheng, Guo-Qing ; Tou, H. ; Magishi, K. ; Matsumoto, S. ; Yamazoe, K. ; Yamanaka, H. ; Asayama, K. / NMR study in novel superconductors : Heavy-fermion system and high-Tc cuprate. In: Journal of Physics and Chemistry of Solids. 1995 ; Vol. 56, No. 12. pp. 1931-1935.
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