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Element-specific observation of the ferromagnetic ordering process in UCoAl via soft X-ray magnetic circular dichroism

軟X線磁気円二色性によるUCoAlにおける磁化過程の元素選択的観測

竹田 幸治; 斎藤 祐児; 岡根 哲夫; 山上 浩志; 松田 達磨*; 山本 悦嗣; 芳賀 芳範; 大貫 惇睦*

Takeda, Yukiharu; Saito, Yuji; Okane, Tetsuo; Yamagami, Hiroshi; Matsuda, Tatsuma*; Yamamoto, Etsuji; Haga, Yoshinori; Onuki, Yoshichika*

We have performed soft X-ray magnetic circular dichroism (XMCD) experiments on the itinerant-electron metamagnet UCoAl at the U 4$$d$$-5$$f$$ ($$N_mathrm{4, 5}$$) and Co 2$$p$$-3$$d$$ ($$L_mathrm{2, 3}$$) absorption edges in order to investigate the magnetic properties of the U 5$$f$$ and Co 3$$d$$ electrons separately. From the line shape of the XMCD spectrum, it is deduced that the orbital magnetic moment of the Co 3$$d$$ electrons is unusually large. Through the systematic temperature ($$T$$)- and magnetic field ($$H$$)-dependent XMCD measurements, we have obtained two types of the magnetization curve as a function of $$H$$ and $$T$$ (M-H curve and M-T curve, respectively). The metamagnetic transition from a paramagnetic state to a field-induced ferromagnetic state was observed clearly under 15 K at $$H_mathrm{M}$$. The value of the $$H_mathrm{M}$$ and its $$T$$-dependence agree well between the U and Co sites, and the bulk magnetization. Whereas, we have discovered the remarkable differences in the M-H and M-T curves between the U and Co sites. The present findings show clearly that the role of the Co 3$$d$$ electrons should be considered more carefully in order to understand the origin of the magnetic ordering in UCoAl.

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パーセンタイル:100

分野:Materials Science, Multidisciplinary

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