Magnetoelastic Effects in UNiAl and UCoAl
نویسنده
چکیده
We report on strongly anisotropic thermal-expansion and magnetostriction of UNiAl and UCoAl within the frame of the 5f -electron magnetism. Both the compounds crystallize in the hexagonal ZrNiAl-type structure and exhibit huge magnetocrystalline anisotropy with the c-axis as the easy magnetization direction. UNiAl orders antiferromagnetically (TN ≈ 19 K) and exhibits a field-induced metamagnetic transition at ≈ 11.4 T yielding an irreversible change of the zero-field magnetic structure, transport properties and specific heat at temperatures below 7 K. UCoAl shows an itinerant 5f -electron metamagnetism below a characteristic temperature, T∗ = 10 K with the critical field, Bc ∼1 T. The thermal-expansion results in magnetic fields corroborate the observed phenomena and will be discussed within the scenario of strong antiferromagnetic (AF) correlations (UNiAl-case) and itinerant electron metamagnetism (UCoAl).
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