Specific heat of amorphous CexRu100-x alloys

Y. Amakai, S. Murayama, H. Takano, M. Mizutani, K. Asano, Y. Obi, K. Takanashi

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8 Citations (Scopus)

Abstract

We have measured the specific heat on sputtered amorphous (a-) CexRu100-x alloys for 15≤ x≤80 from 5 to 300 K. The Cp/T nicely follows a function of γ+BT2 above 8 K in each Ce concentration. In the Ce-rich side (x≥67), the electronic specific coefficient γ shows a very large value (γ=180 mJ/mol K2 at x=80), suggesting formation of the heavy fermion (dense Kondo) state at low temperature. However, the γ decreases rapidly with decreasing the Ce concentration. In the Ru-rich side (x<39), the γ becomes less than 10 mJ/mol K2 and the superconductivity occurs. This γ-value is almost the same as for a-Ce20-yLayRu80 in each La concentration, where the superconductivity occurs at the same superconducting temperature Tc. We made the Kadowaki-Woods plot from the coefficient A of the T2 term in resistivity and γ in the Ce-rich side. The value of A/γ2 for present alloys shows about 3.5×10-6 μ Ω cm(mol K2/mJ)2.

Original languageEnglish
Pages (from-to)416-418
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 1
DOIs
Publication statusPublished - 2007 Mar

Keywords

  • Amorphous alloys
  • Ce-Ru
  • Heavy fermion
  • Specific heat
  • Superconductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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