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Magnetization and Specific Heat of UCo0.95T0.05Al (T = Fe, Ni) Single Crystals

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Czechoslovak Journal of Physics Aims and scope

Abstract

We present the first single-crystal study of Fe and Ni doped U(Co1-x T x )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 30 K. 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.

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Authors and Affiliations

  1. Institute of Physics, Acad. Sci. CR, Na Slovance 2, 182 21, Praha 8, Czech Republic

    A.V. Andreev

  2. Department of Electronic Structures, Charles University, Ke Karlovu 5, 121 16, Praha 2, Czech Republic

    B. Janoušová & V. Sechovský

  3. IMR, Tohoku University, Sendai, 980-8577, Japan

    Y. Homma & Y. Shiokawa

Authors
  1. A.V. Andreev
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  2. B. Janoušová
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  3. V. Sechovský
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  4. Y. Homma
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  5. Y. Shiokawa
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Andreev, A., Janoušová, B., Sechovský, V. et al. Magnetization and Specific Heat of UCo0.95T0.05Al (T = Fe, Ni) Single Crystals. Czechoslovak Journal of Physics 52, 275–278 (2002). https://doi.org/10.1023/A:1014448519010

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  • DOI: https://doi.org/10.1023/A:1014448519010

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