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Journal Articles

XAS and MCD studies in Laves compounds with multi-magnetic phase transitions

Mizumaki, Masaichiro*; Yoshii, Kenji; Kawamura, Naomi*; Watanabe, Yasuhiro*; Nanao, Susumu*

Physica Status Solidi (C), 3(8), p.2762 - 2766, 2006/09

 Times Cited Count:0 Percentile:0.02

We investigated the magnetic phase transition of the Laves phases, which shows the multiple magnetic phase transition, by using X-ray absorption (XAS) and magnetic circular dichroism (MCD). XAS-MCD measurements were performed around the Fe-$$K$$ and L$$_{2,3}$$ edges. The magnet optical sum rule was applied to XAS and MCD spectra of L$$_{2,3}$$ edges. The orbital and spin magnetic moment were estimated respectively. The orbital magnetic moment increased abruptly below the magnetic phase transition temperature. The spin magnetic moment had no abrupt change at the magnetic phase transition temperature. This shows that there is a strong correlation between the multiple magnetic phase transition and the orbital magnetic moment.

Journal Articles

X-ray magnetic circular dichroism studies in Ce(Fe$$_{1-x}$$Co$$_{x}$$)$$_{2}$$

Mizumaki, Masaichiro*; Yoshii, Kenji; Watanabe, Yasuhiro*; Nanao, Susumu*

Journal of Alloys and Compounds, 408-412, p.737 - 740, 2006/02

 Times Cited Count:3 Percentile:29.59(Chemistry, Physical)

We have measured XAS and MCD spectra at Ce L$$_{2,3}$$-edges in Ce(Fe$$_{1-x}$$Co$$_{x}$$)$$_{2}$$. All the XAS spectra around the Ce-L$$_{3}$$ edge exhibit a double-peak structure that is the characteristic feature of the mixed-valence system. The ratio of the 4f$$^{1}$$ peak intensity to the 4f$$^{0}$$ peak intensity in the Ce L$$_{2,3}$$-edges increased as the composition of Co increased. But the MCD and XAS spectral shape changed slightly for Ce(Fe$$_{1-x}$$Co$$_{x}$$)$$_{2}$$. As the Co composition increased, MCD intensity decreased. Applying to Sum rules, we found that the orbital magnetic moment of Ce-5d electrons is very small but does exist.

Journal Articles

Fine structure in the quadrupoloar transition of the Ho ${it L}$ $$_{3}$$ pre-edge observed by lifetime-broadening-suppressed XANES spectroscopy

Hayashi, Hisashi*; Kawata, Masaki*; Sato, Atsushi*; Udagawa, Yasuo*; Inami, Toshiya; Ishii, Kenji; Ogasawara, Haruhiko*; Nanao, Susumu*

Physical Review B, 72(4), p.045114_1 - 045114_5, 2005/07

 Times Cited Count:12 Percentile:48.79(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Quadrupole and hexadecapole ordering in DyB$$_2$$C$$_2$$; Direct observation with resonant X-ray diffraction

Tanaka, Yoshikazu*; Inami, Toshiya; Lovesey, S. W.*; Knight, K. S.*; Yakhou, F.*; Mannix, D.*; Kokubun, Jun*; Kanazawa, Masayuki*; Ishida, Kotaro*; Nanao, Susumu*; et al.

Physical Review B, 69(2), p.024417_1 - 024417_11, 2004/01

 Times Cited Count:35 Percentile:79.89(Materials Science, Multidisciplinary)

Direct evidence of the spatial ordering of Dy 4$$f$$ quadrupole and hexadecapole moments in DyB$$_2$$C$$_2$$ is demonstrated by resonant X-ray diffraction enhanced by an electric quadrupole event ($$E$$2 resonance) at the Dy L$$_{III}$$ absorption edge. The diffraction data show that the structural phase transition at $$T$$$$_{Q}$$ = 24.7 K is accompanied by a reduction in the symmetry of the Dy site to 2/$$m$$, from 4/$$m$$, and the spatial ordering of the time-even Dy multipoles with A$$_{g}$$ character. Below $$T$$$$_{Q}$$ the crystal structure is described by the space group $$P$$4$$_2$$/$$mnm$$ and Dy ions occupy sites (4$$c$$). The distortion at T$$_{Q}$$ involves the lattice occupied by B and C ions, and it amounts to a buckling of B-C planes that are normal to the two-fold rotation axis of 2/$$m$$. An immediately plausible model of low-energy Dy states correlates data on the specific heat, our X-ray diffraction signals, and magnetic ordering below 15.3 K which has been observed in magnetic neutron diffraction.

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