Experimental and theoretical comparison between absorption, total electron yield, and fluorescence spectra of rare-earth<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>M</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>edges

Pompa, M.; Flank, A.M.; Lagarde, P.; Rife, J. C.; Stekhin, I.E.; Nakazawa, Makoto; Ogasawara, Haruhiko; Kotani, Akio

doi:10.1103/physrevb.56.2267

Cited by 31 publications

(23 citation statements)

References 20 publications

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“…According to the nonmagnetic J = 0 singlet (4f 6 ) of Sm 2+ , the XMCD signal comes from the Sm 3+ contribution at the surface with a shape similar to that observed in SmAl 2 [46] and Sm 0.974 Gd 0.02 Al 2 [47]. Several phenomena related to the multiplet structure of the intermediate state may occur which render FY XMCD different from the true XMCD spectrum at the M 4,5 edge of rare earths [41]. Thus, the main qualitative observation for the bulk is a reduced XMCD intensity, roughly 1/4, as compared to the XMCD on the surface, indicating a much smaller 4f contributed magnetization in the bulk SmB 6 .…”

Section: Resultsmentioning

confidence: 86%

“…A weighted sum of TEY-and FY-XAS (4 K) has been built and compared to the experimental spectra, shown in Figs. 1(b) Even after the self-absorption correction for the FY XAS, the valence of Sm still can be overestimated [41]. In order to extract the valence of the Sm in the bulk under pressure, experimental Sm L 2 edge XAS spectra are recorded and shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Surface- and pressure-induced bulk Kondo breakdown in SmB6

et al. 2018

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Motivated by the prediction of surface Kondo breakdown in topological Kondo insulators, we investigated the valence and magnetism of SmB 6 with x-ray absorption and magnetic circular dichroism at the Sm M 4,5 and L 2 edges with surface and bulk sensitivity, respectively. A higher Sm valence state at the surface and in the bulk under pressure indicates the surface-and pressure-induced bulk Kondo breakdown. We confirmed the different magnetization origin from the surface (f electron) to the bulk (d electron) and ascertained the direct relationship between the disappearance of the Sm L 2 -edge x-ray magnetic circular dichroism signal and the closure of the d-f hybridization gap in SmB 6 bulk under pressure, paving the way for further investigations of the Kondo insulators. Above P c = 8.5 GPa, a more localized 4f state with higher valence and the disappearing of the 5d magnetism are observed, suggesting the closure of the hybridization gap in the bulk.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Surface- and pressure-induced bulk Kondo breakdown in SmB6

et al. 2018

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“…In 1994 it was shown that the FY detected spectrum of a nickelcyanide complex does not relate to the 2p x-ray absorption XAS spectrum due to the state dependent intensity fluctuations of the fluorescence decay channels 16 . The same mechanism is responsible for the difference between FY-XAS and XAS at the M 5 -edge of rare earth systems 17 . In contrast, most experimental studies involving experimental FY spectra do not seem affected by distortions from the XAS spectral shape, or at least they are not analyzed for the possibility as being distorted.…”

Section: Introductionmentioning

confidence: 90%

Intrinsic deviations in fluorescence yield detected x-ray absorption spectroscopy: the case of the transition metal L_2,3edges

Kurian

Kunnus

Wernet

et al. 2012

J. Phys.: Condens. Matter

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Fluorescence yield (FY) detected x-ray absorption spectrum spectra (XAS) of 3d transition metal ions are calculated from the integrated 2p3d resonant x-ray emission spectrum. The resulting FY-XAS spectra are compared with the normal XAS spectra corresponding to the absorption cross section and significant deviations between both spectra are found. This implies that the assumption that the FY-XAS spectrum identifies with the XAS spectrum is disproved. Especially for the early transition metal systems the differences between FY-XAS and XAS are large, due to the opening of inelastic decay channels from selected x-ray absorption final states. The theoretical calculations show that the difference between FY detection and XAS is largest for the detection in depolarized geometry. The calculations are compared with experimental spectra for oxides and coordination compounds for Fe 2+ , Co 2+ and Ni 2+ systems. The implications for the sum rules in XAS and magnetic circular dichroism experiments are discussed.

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“…35,36 Although some work mentioned the possible distortion in 3d metals, our spectra for the dilute (0.14%) Ni II ion do not show a significant distortion effect. The ratio of L 3 to L 2 peak heights is about 4:1, which agrees well with previous TEY results (also 4:1) on high-spin Ni II compounds in the reports 26,27 and in our own measurements ( Figure 3).…”

Section: Resultsmentioning

confidence: 70%

Fluorescence-Detected X-ray Magnetic Circular Dichroism of Well-Defined Mn^II and Ni^II Doped in MgO Crystals: Credential Evaluation for Measurements on Biological Samples

et al. 2012

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L(2,3)-edge X-ray magnetic circular dichroism (XMCD) spectra have been measured for the well-defined dilute Ni(II) and Mn(II) ions doped into a MgO crystal, with sub-Kelvin dilution refrigerator cooling and 2 T magnetic field magnetization. A 30-element Ge array X-ray detector has been used to measure the XMCD for these dilute ions, whose concentrations are 1400 ppm for Ni(II) and 10,000 ppm for Mn(II). Large XMCD effects have been observed for both Ni(II) and Mn(II), and multiplet simulation described the observed spectra. The fluorescence-detected L-edge absorption spectrum and XMCD of Ni(II) in MgO are comparable with both theoretical calculations and the total electron yield measured ions in similar chemical environments, at least qualitatively validating the use of the sensitive fluorescence detection technique for studying XMCD for dilute 3d metal ions, such as various metalloproteins. Sum rule analyses on the XMCD spectra are also performed. In addition, these XMCD measurements have also been used to obtain the sample's magnetization curve and the beamline's X-ray helicity curve. This study also illustrated that bend magnet beamlines are still useful in examining XMCD on dilute and paramagnetic metal sites.

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Experimental and theoretical comparison between absorption, total electron yield, and fluorescence spectra of rare-earthM5edges

Cited by 31 publications

References 20 publications

Surface- and pressure-induced bulk Kondo breakdown in SmB6

Surface- and pressure-induced bulk Kondo breakdown in SmB6

Intrinsic deviations in fluorescence yield detected x-ray absorption spectroscopy: the case of the transition metal L_2,3edges

Fluorescence-Detected X-ray Magnetic Circular Dichroism of Well-Defined Mn^II and Ni^II Doped in MgO Crystals: Credential Evaluation for Measurements on Biological Samples

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Experimental and theoretical comparison between absorption, total electron yield, and fluorescence spectra of rare-earthM5edges

Cited by 31 publications

References 20 publications

Surface- and pressure-induced bulk Kondo breakdown in SmB6

Surface- and pressure-induced bulk Kondo breakdown in SmB6

Intrinsic deviations in fluorescence yield detected x-ray absorption spectroscopy: the case of the transition metal L2,3edges

Fluorescence-Detected X-ray Magnetic Circular Dichroism of Well-Defined MnII and NiII Doped in MgO Crystals: Credential Evaluation for Measurements on Biological Samples

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Product

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Intrinsic deviations in fluorescence yield detected x-ray absorption spectroscopy: the case of the transition metal L_2,3edges

Fluorescence-Detected X-ray Magnetic Circular Dichroism of Well-Defined Mn^II and Ni^II Doped in MgO Crystals: Credential Evaluation for Measurements on Biological Samples