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Critical behavior of magnetization in URhAl; Quasi-two-dimensional Ising system with long-range interactions

Tateiwa, Naoyuki; Pospisil, J.*; Haga, Yoshinori; Yamamoto, Etsuji

The critical behavior of dc magnetization in the uranium ferromagnet URhAl with the hexagonal ZrNiAl-type crystal structure has been studied around the ferromagnetic transition temperature $$T_{rm C}$$. The critical exponent $$beta$$ for the temperature dependence of the spontaneous magnetization below $$T_{rm C}$$, $$gamma$$ for the magnetic susceptibility, and $$delta$$ for the magnetic isotherm at $$T_{rm C}$$ have been obtained. We have determined the critical exponents as $$beta$$ = 0.287 $$pm$$ 0.005, $$gamma$$ = 1.47 $$pm$$ 0.02, and $$delta$$ = 6.08 $$pm$$ 0.04 by the scaling analysis and the critical isotherm analysis. These critical exponents satisfy the Widom scaling law $${delta}{,}={,}1+{,}{gamma}/{beta}$$. The determined exponents can be explained with the results of the renormalization group approach for a two-dimensional Ising system coupled with long-range interactions.

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Category:Materials Science, Multidisciplinary

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