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Report No.

Unconventional critical scaling of magnetization in ferromagnetic uranium superconductors UGe$$_2$$ and URhGe

Tateiwa, Naoyuki; Haga, Yoshinori; Matsuda, Tatsuma*; Yamamoto, Etsuji; Fisk, Z.

We report a dc magnetization study of the critical phenomenon around the ferromagnetic transition temperature $$T_{rm C}$$ in high-quality single crystals of uranium ferromagnetic superconductors UGe$$_2$$ and URhGe. Although the values of the critical exponent $$beta$$ and $$delta$$ for the magnetization in UGe$$_2$$ and URhGe are close to those in the 3D magnets, the values of the critical exponent $$gamma$$ for the magnetic susceptibility are close to unity, that expected from the mean field theory. The unconventional critical scaling of magnetization in UGe$$_2$$, and URhGe cannot be explained via previous approaches to critical phenomena.



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Category:Materials Science, Multidisciplinary



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