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

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Other Title
  • 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

Abstract

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.

Journal

  • Physical Review B

    Physical Review B 97 (18), 184414_1-184414_7, 2018-05

    American Physical Society (APS)

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