Magnetization and Specific Heat of UCo0.95T0.05Al (T = Fe, Ni) Single Crystals |
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| Authors: | AV Andreev B Janou?ová V Sechovský Y Homma Y Shiokawa |
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| Institution: | (1) Institute of Physics, Acad. Sci. CR, Na Slovance 2, 182 21 Praha 8, Czech Republic;(2) Department of Electronic Structures, Charles University, Ke Karlovu 5, 121 16 Praha 2, Czech Republic;(3) IMR, Tohoku University, Sendai, 980-8577, Japan |
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| 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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| Keywords: | UCoAl metamagnetism spin fluctuations |
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