Magnetization and specific heat of UCo0.95T0.05Al (T = Fe, Ni) single crystals

A. V. Andreev, B. Janoušová, V. Sechovský, Y. Homma, Y. Shiokawa

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We present the first single-crystal study of Fe and Ni doped U(Co1-xTx)Al compounds in comparison to the parent compound, the itinerant 5f-electron metamagnet UCoAl. Magnetization and specific-heat data measured in the temperature range of (1.8-300) K and in fields up to 10 T are analyzed and discussed. Both compounds exhibit a strong uniaxial anisotropy with the dominating magnetic response along the c-axis of the hexagonal ZrNiAl-type structure. Ni substitution yields an increase of the critical field for metamagnetism; UCo0.95Fe0.05Al is ferromagnetic below 30K. Temperature evolution of the entropy change between 0 and 10 T points to involvement of magnetic correlations or spin fluctuations in the paramagnetic compounds UCoAl and UCo0.95Ni0.05Al.

Original languageEnglish
Pages (from-to)275-278
Number of pages4
JournalCzechoslovak Journal of Physics
Issue number2
Publication statusPublished - 2002 Feb


  • Metamagnetism
  • Spin fluctuations
  • UCoAl


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