High-magnetic-field XMCD as a novel tool for the study of valence fluctuation phenomena-application to eu-based intermetallic compounds

Y. H. Matsuda; J. L. Her; T. Inami; K. Ohwada; Z. W. Ouyang; K. Okada; H. Nojiri; A. Mitsuda; H. Wada; N. Kawamura; M. Suzuki

doi:10.1007/s10909-009-0129-z

High-magnetic-field XMCD as a novel tool for the study of valence fluctuation phenomena-application to eu-based intermetallic compounds

Y. H. Matsuda, J. L. Her, T. Inami, K. Ohwada, Z. W. Ouyang, K. Okada, H. Nojiri, A. Mitsuda, H. Wada, N. Kawamura, M. Suzuki

Institute for Materials Research (IMR)

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

X-ray magnetic circular dichroism (XMCD) in Eu-based valence fluctuating compounds, EuNi₂(Si_1-x Ge _x )₂ (x=0.82, 0.85) and EuNi₂P₂ are investigated at high magnetic fields up to 40 T. Distinct two XMCD peaks corresponding to different valence states, i.e., Eu²⁺ and Eu³⁺ states are observed in EuNi₂(Si_1-x Ge _x )₂ (x=0.82) and EuNi₂P₂ at the L absorption edges (2p→5d). This suggests that the Eu 5d electrons are magnetically polarized in the both valence states. Since Eu³⁺ state has nonmagnetic ground state J=0, where J is total angular momentum, finite XMCD of Eu³⁺ state can be closely related to the magnetic polarization of the conduction electrons that is induced by the local magnetic moments of Eu²⁺ (J=7/2) state through the strong hybridization.

Original language	English
Pages (from-to)	292-296
Number of pages	5
Journal	Journal of Low Temperature Physics
Volume	159
Issue number	1-2
DOIs	https://doi.org/10.1007/s10909-009-0129-z
Publication status	Published - 2010 Apr

Keywords

Pulsed high magnetic fields
Synchrotron x-rays
Valence fluctuation
XMCD

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics

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Matsuda, Y. H., Her, J. L., Inami, T., Ohwada, K., Ouyang, Z. W., Okada, K., Nojiri, H., Mitsuda, A., Wada, H., Kawamura, N., & Suzuki, M. (2010). High-magnetic-field XMCD as a novel tool for the study of valence fluctuation phenomena-application to eu-based intermetallic compounds. Journal of Low Temperature Physics, 159(1-2), 292-296. https://doi.org/10.1007/s10909-009-0129-z

High-magnetic-field XMCD as a novel tool for the study of valence fluctuation phenomena-application to eu-based intermetallic compounds. / Matsuda, Y. H.; Her, J. L.; Inami, T.; Ohwada, K.; Ouyang, Z. W.; Okada, K.; Nojiri, H.; Mitsuda, A.; Wada, H.; Kawamura, N.; Suzuki, M.

In: Journal of Low Temperature Physics, Vol. 159, No. 1-2, 04.2010, p. 292-296.

Research output: Contribution to journal › Article › peer-review

Matsuda, YH, Her, JL, Inami, T, Ohwada, K, Ouyang, ZW, Okada, K, Nojiri, H, Mitsuda, A, Wada, H, Kawamura, N & Suzuki, M 2010, 'High-magnetic-field XMCD as a novel tool for the study of valence fluctuation phenomena-application to eu-based intermetallic compounds', Journal of Low Temperature Physics, vol. 159, no. 1-2, pp. 292-296. https://doi.org/10.1007/s10909-009-0129-z

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abstract = "X-ray magnetic circular dichroism (XMCD) in Eu-based valence fluctuating compounds, EuNi2(Si1-x Ge x )2 (x=0.82, 0.85) and EuNi2P2 are investigated at high magnetic fields up to 40 T. Distinct two XMCD peaks corresponding to different valence states, i.e., Eu2+ and Eu3+ states are observed in EuNi2(Si1-x Ge x )2 (x=0.82) and EuNi2P2 at the L absorption edges (2p→5d). This suggests that the Eu 5d electrons are magnetically polarized in the both valence states. Since Eu3+ state has nonmagnetic ground state J=0, where J is total angular momentum, finite XMCD of Eu3+ state can be closely related to the magnetic polarization of the conduction electrons that is induced by the local magnetic moments of Eu2+ (J=7/2) state through the strong hybridization.",

keywords = "Pulsed high magnetic fields, Synchrotron x-rays, Valence fluctuation, XMCD",

author = "Matsuda, {Y. H.} and Her, {J. L.} and T. Inami and K. Ohwada and Ouyang, {Z. W.} and K. Okada and H. Nojiri and A. Mitsuda and H. Wada and N. Kawamura and M. Suzuki",

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AU - Matsuda, Y. H.

AU - Her, J. L.

AU - Inami, T.

AU - Ohwada, K.

AU - Ouyang, Z. W.

AU - Okada, K.

AU - Nojiri, H.

AU - Mitsuda, A.

AU - Wada, H.

AU - Kawamura, N.

AU - Suzuki, M.

PY - 2010/4

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N2 - X-ray magnetic circular dichroism (XMCD) in Eu-based valence fluctuating compounds, EuNi2(Si1-x Ge x )2 (x=0.82, 0.85) and EuNi2P2 are investigated at high magnetic fields up to 40 T. Distinct two XMCD peaks corresponding to different valence states, i.e., Eu2+ and Eu3+ states are observed in EuNi2(Si1-x Ge x )2 (x=0.82) and EuNi2P2 at the L absorption edges (2p→5d). This suggests that the Eu 5d electrons are magnetically polarized in the both valence states. Since Eu3+ state has nonmagnetic ground state J=0, where J is total angular momentum, finite XMCD of Eu3+ state can be closely related to the magnetic polarization of the conduction electrons that is induced by the local magnetic moments of Eu2+ (J=7/2) state through the strong hybridization.

AB - X-ray magnetic circular dichroism (XMCD) in Eu-based valence fluctuating compounds, EuNi2(Si1-x Ge x )2 (x=0.82, 0.85) and EuNi2P2 are investigated at high magnetic fields up to 40 T. Distinct two XMCD peaks corresponding to different valence states, i.e., Eu2+ and Eu3+ states are observed in EuNi2(Si1-x Ge x )2 (x=0.82) and EuNi2P2 at the L absorption edges (2p→5d). This suggests that the Eu 5d electrons are magnetically polarized in the both valence states. Since Eu3+ state has nonmagnetic ground state J=0, where J is total angular momentum, finite XMCD of Eu3+ state can be closely related to the magnetic polarization of the conduction electrons that is induced by the local magnetic moments of Eu2+ (J=7/2) state through the strong hybridization.

KW - Pulsed high magnetic fields

KW - Synchrotron x-rays

KW - Valence fluctuation

KW - XMCD

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