Magnetic susceptibility in 2D superconductor NaxHfNCI system

Shin Ichi Shamoto, Keigo Iizawa, Yusuke Asano, Kenji Ohoyama, Tsuyoshi Kajitani

Research output: Contribution to journalConference article

9 Citations (Scopus)


Superconducting critical temperature, Tc' and the shielding volume fraction, SVF, of layered nitride superconductor NaxHfNCl have been studied as a function of x, i.e. Na concentration. Although Tc decreases gradually with increasing x from 20.0 K at r=0.11 to 16.5 K at x=0.85, SVF has a sharp peak around x=1/6, where strong coupling between local ordering of Na atoms and Fermi surface instability can be expected. Structural disorder in the samples above x=0.5, observed by powder neutron diffraction, does not affect the superconductivity appreciably. Electronic specific heat coefficient, γ, is estimated to be about 7.7 mJ/mol/K2 by its difference of magnetic susceptibility between HfNCl and Na0.5HfNCl. The γ value is relatively small compared with the high Tc value, revealing double honeycomb lattice system as new potential higher Tc superconductor series by intercalation.

Original languageEnglish
Pages (from-to)515-520
Number of pages6
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Publication statusPublished - 2000 Jan 1
Event10th International Symposium on Intercalation Compounds (ISIC 10) - Okasaki, Japan
Duration: 1999 May 301999 Jun 3


  • 2D superconductor
  • Fermi surface nesting
  • Magnetic susceptibility
  • NaHfNCI
  • Neutron diffraction
  • Volume fraction

ASJC Scopus subject areas

  • Condensed Matter Physics

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