Soft X-ray Beamline Specialized for Actinides and Radioactive Materials Equipped with a Variably Polarizing Undulator

Yokoya, Akinari; Sekiguchi, T.; Saitoh, Y.; Okane, Tetsuo; Nakatani, Takeshi; Shimada, Taihei; Kobayashi, Hiroshi; Takao, M.; Teraoka, Yuden; Hayashi, Yukimasa; Sasaki, Shigemi; Miyahara, Yoshikazu; Harami, T.; Sasaki, Taizo

doi:10.1107/s0909049597010273

Cited by 79 publications

(55 citation statements)

References 11 publications

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“…In this beamline, the excitation soft x-ray from an APPLE-2-type undulator with variable light polarization was monochromatized with a variable line spacing plane grating monochromator and was focused onto the specimens 32,33) . Angle-resolved spectra were obtained with a high-resolution hemispherical electron analyzer (GAMMADATA SCIENTA SES-2002) with the input electron lens at 45 to the incident excitation soft x-ray.…”

Section: Methodsmentioning

confidence: 99%

Angle-Resolved Photoemission Analysis of Electronic Structures for Thermoelectric Properties of Off-Stoichiometric Fe2–xV1+xAl Alloys

et al. 2016

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The electronic states of Heusler (L2 1 )-type off-stoichiometric Fe 2-x V 1+x Al alloys have been investigated by soft x-ray angle-resolved photoelectron spectroscopy (ARPES) to clarify the origin of the remarkable increase in thermoelectric power, which cannot be explained by the rigid-band model. In off-normal and normal ARPES, Fe 2.05 V 0.95 Al shows weakly dispersive bulk bands from the binding energy of 0.3 eV at the Γ point in the Γ-X and Γ-L directions, and an almost dispersionless one around 0.3 eV in the gap of dispersive bulk bands in the Γ-L direction, which is attributed to antisite Fe defects. At the Γ point, the bulk bands do not appear to cross the Fermi level E F , which is consistent with the rigid-band model for excess Fe content, but no band crossing E F is found at the X point. The antisite Fe defect states near E F might push up the band at the X point and cause p-type thermoelectric properties, which is unexpected for the rigid-band model. The change in electronic structures and thermoelectric properties for the off-stoichiometry and substitution by a forth element is discussed.

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Section: Methodsmentioning

confidence: 99%

Angle-Resolved Photoemission Analysis of Electronic Structures for Thermoelectric Properties of Off-Stoichiometric Fe2–xV1+xAl Alloys

et al. 2016

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“…16 X-ray absorption spectroscopy ͑XAS͒ and XMCD measurements were performed at the helical undulator beam line BL23SU of SPring-8. 30,31 The monochromator resolution was E / ⌬E Ͼ 10, 000. Absorption spectra of right-handed ͑ + ͒ and left-handed ͑ − ͒ circularly polarized x rays were obtained by reversing photon helicity at each photon energy in the total-electron-yield mode.…”

Section: Methodsmentioning

confidence: 99%

Antiferromagnetic interaction between paramagnetic Co ions in the diluted magnetic semiconductorZn1−xCoxO

et al. 2010

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The magnetic properties of Zn 1−x Co x O ͑x = 0.07 and 0.10͒ thin films, which were homoepitaxially grown on a ZnO͑0001͒ substrates with varying relatively high oxygen pressure, have been investigated using x-ray magnetic circular dichroism ͑XMCD͒ at Co 2p core-level absorption edge. The line shapes of the absorption spectra are the same in all the films and indicate that the Co 2+ ions substitute for the Zn sites. The magneticfield and temperature dependences of the XMCD intensity are consistent with the magnetization measurements, indicating that except for Co there are no additional sources for the magnetic moment, and demonstrate the coexistence of paramagnetic and ferromagnetic components in the homoepitaxial Zn 1−x Co x O thin films, in contrast to the ferromagnetism in the heteroepitaxial Zn 1−x Co x O films studied previously. The analysis of the XMCD intensities using the Curie-Weiss law reveals the presence of antiferromagnetic interaction between the paramagnetic Co ions. Missing XMCD intensities and magnetization signals indicate that most of Co ions are nonmagnetic probably because they are strongly coupled antiferromagnetically with each other. Annealing in a high vacuum reduces both the paramagnetic and ferromagnetic signals. We attribute the reductions to thermal diffusion and aggregation of Co ions with antiferromagnetic nanoclusters in Zn 1−x Co x O.

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“…By a special monochromator adjustment the energy range for XAFS experiments can be extended to 24 keV. In the soft X-ray range the experimental possibilities to study radioactive materials have been further improved by the construction of an end-station at SPring-8 which provides linearly or circularly polarized light in the energy range 0.28±1.5 keV (Yokoya et al, 1998).…”

Section: Synchrotron Radiation Beamlines For Studying Radioactive Matmentioning

confidence: 99%

ROBL – a CRG beamline for radiochemistry and materials research at the ESRF

Matz

Schell

Bernhard

et al. 1999

J Synchrotron Radiat

192

116

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The paper describes the Rossendorf beamline (ROBL) built by the Forschungszentrum Rossendorf at the ESRF. ROBL comprises two different and independently operating experimental stations: a radiochemistry laboratory for X-ray absorption spectroscopy of non-sealed radioactive samples and a general purpose materials research station for X-ray diffraction and re¯ectometry mainly of thin ®lms and interfaces modi®ed by ion beam techniques.

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Soft X-ray Beamline Specialized for Actinides and Radioactive Materials Equipped with a Variably Polarizing Undulator

Cited by 79 publications

References 11 publications

Angle-Resolved Photoemission Analysis of Electronic Structures for Thermoelectric Properties of Off-Stoichiometric Fe<sub>2–x</sub>V<sub>1+x</sub>Al Alloys

Angle-Resolved Photoemission Analysis of Electronic Structures for Thermoelectric Properties of Off-Stoichiometric Fe<sub>2–x</sub>V<sub>1+x</sub>Al Alloys

Antiferromagnetic interaction between paramagnetic Co ions in the diluted magnetic semiconductorZn1−xCoxO

ROBL – a CRG beamline for radiochemistry and materials research at the ESRF

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