Superconductivity in W-containing diamond-like nanocomposite films

Hiroyuki Miki, Takanori Takeno, Toshiyuki Takagi, Alexei Bozhko, Mikhail Shupegin, Hideya Onodera, Takao Komiyama, Takashi Aoyama

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Superconductivity in a tungsten-containing carbon-oxide film was reported. The film with 500 nm thickness was deposited onto polycrystalline silicon oxides using chemical vapor deposition and the co-sputtering of a tungsten metal target. The bonding state of the carbon atoms and the macroscopic and microscopic crystal structure of the film were investigated by Raman spectroscopy, X-ray diffraction and transmission electron microscopy measurements. From the experimental results, we determined that this film essentially had an amorphous structure. The temperature dependence on resistivity was measured in the temperature range of 2-300 K. Resistive superconducting transition was observed at 3.8 K. The dc magnetizations were measured in the temperature range of 1.8-6.5 K. The diamagnetism resulting from a superconductive state was observed below 3.75 K, which is consistent with a resistive superconducting transition. It is thought that the finite sized clusters of the different superconductive transition temperatures cooperatively produce a macroscopic superconducting phenomenon.

Original languageEnglish
Pages (from-to)1898-1901
Number of pages4
JournalDiamond and Related Materials
Volume15
Issue number11-12 SPEC. ISS.
DOIs
Publication statusPublished - 2006 Nov

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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