Formation of metastable conductive nanowire in a thiospinel compound CuIr2S4 induced by ion irradiation

Masanori Koshimizu, Hirotaka Tsukahara, Keisuke Asai

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We observed an increase in the conductivity of a thiospinel compound, CuIr2S4, induced by H+ and He+ irradiation with energies of 1-2 MeV. It was indicated that the metastable conductive phase was produced by electronic excitation due to the ion beam and this phase was similar to the X-ray-induced phase. Conductivity as a function of ion fluence was analyzed by a simple model where the ion-induced change occurred in a cylindrical region around an ion trajectory. The cross-sectional area of the cylinder was obtained by analyzing the conductivity as a function of ion fluence for each ion, and it was found that an impinging ion produced a nanowire in the conductive phase. In addition, the yield of the Ir dimer displacement, which was related to the increase in conductivity, was considerably high. The ion irradiation effect reported in this paper is unique with regard to the high yield and low linear energy transfer (LET) in the formation of the conductive-phase nanowire. Both these unique aspects could be ascribed to the low band-gap energy and strong electron-lattice interaction of this compound.

Original languageEnglish
Pages (from-to)1125-1128
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume267
Issue number7
DOIs
Publication statusPublished - 2009 Apr 15

Keywords

  • CuIrS
  • G-value
  • Ion irradiation
  • Nanowire
  • Thiospinel compound

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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