Coherent Electron-Correlation Compatible with Random Atom Stacking in Amorphous Ce-Ru Alloys

Yoshiya Homma, Kenji Sumiyama, Hiroshi Yamauchi, Kenji Suzuki

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The amorphous Ce Ru alloys produced by the sputtering technique show the following distinct behaviors at low temperatures. The electronic specific heat coefficient rapidly increases below 5 K for Ce-19 and 42 at.%Ru alloys with decreasing temperature, T, (a heavy fermion behavior). The electrical resistivity displays -logT dependence a T > 40 K (an incoherent or impurity Kondo effect). It slightly decreases at T < 30 K for Ce-19 and 42 at.%Ru alloys (a coherent Kondo effect), while it abruptly decreases at 2.5 K for 82 at.%Ru (a superconducting phenomenon). The coherent states may originate from the strong mixing and correlation of 4f-electrons and conduction-electrons even in the random alloy system.

Original languageEnglish
Pages (from-to)1457-1464
Number of pages8
Journaljournal of the physical society of japan
Volume66
Issue number5
DOIs
Publication statusPublished - 1997 Jan 1

Keywords

  • Cerium-ruthenium alloy
  • Coherent Kondo effect
  • Heavy fermion
  • Incoherent Kondo effect
  • Intermediate valence state
  • Low temperature specific heat
  • Magnetic susceptibility
  • Magnetoresistance
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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