Phonon anomaly on NaxHfNCl Superconductors with Tc22 K

Shin Ichi Shamoto, Atsuo Hirai, Shoji Yamanaka, Naofumi Aso, Tsuyoshi Kajitani

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Abstract

Inelastic neutron scattering measurements have been performed on superconducting NaxHfNCl powder samples with x =0.27 and 0.38 (Tc= 22K) We have observed several temperature dependent phonon anomalies, e.g. at E ∼ 15, 29, 76, and 81 meV for the former sample. A phonon peak with E =14.5meV at Q ∼ 6A°-1 increases for both samples with decreasing temperature below T = 40K; which is much higher than Tc. The phonon peak is assigned to an ab-plane vibrational mode, Eu, of chlorine and hafnium atoms, which strongly modifies the electronic band structure. The phonon anomaly is discussed in terms of carrier inhomogeneity.

Original languageEnglish
Pages (from-to)295-300
Number of pages6
JournalJournal of Neutron Research
Volume12
Issue number4
DOIs
Publication statusPublished - 2004

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering

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