Hyperfine Splitting and Nuclear Spin Polarization in NdPd5Al2and Nd3Pd20Ge6

Naoto Metoki; Kaoru Shibata; Masato Matsuura; Hideaki Kitazawa; Hiroyuki S. Suzuki; Hiroki Yamauchi; Masato Hagihala; Matthias D. Frontzek; Masaaki Matsuda

doi:10.7566/JPSJ.91.054710

Hyperfine Splitting and Nuclear Spin Polarization in NdPd₅Al₂and Nd₃Pd₂₀Ge₆

Naoto Metoki, Kaoru Shibata, Masato Matsuura, Hideaki Kitazawa, Hiroyuki S. Suzuki, Hiroki Yamauchi, Masato Hagihala, Matthias D. Frontzek, Masaaki Matsuda

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Abstract

The hyperfine splitting of Nd nuclei in NdPd5Al2 was studied by means of high-resolution neutron spectroscopy. We observed inelastic peaks at hω = ±3 μeV and T = 0.3 K, originating from the hyperfine splitting in the magnetically ordered phase owing to the hyperfine interactions between Nd nuclei (I = 7=2) and the 4 f electrons with the Γ6 ground state composed of mainly |±9/2. At very low temperatures, the nuclear spin of Nd is polarized with an increasing occupation probability of low energy levels and contributes to the enhancement of the antiferromagnetic Bragg intensities; the elastic non-spin-flip channel is dominant. As an application of this phenomenon, we determined the Nd moment and hyperfine splitting from the temperature dependence of an antiferromagnetic Bragg intensity for Nd3Pd20Ge6.

Original language	English
Article number	054710
Journal	Journal of the Physical Society of Japan
Volume	91
Issue number	5
DOIs	https://doi.org/10.7566/JPSJ.91.054710
State	Published - May 15 2022

Funding

We thank H. Sakai for stimulating discussions and S. Ohira-Kawamura for technical support. The neutron experiment at J-PARC=MLF was performed under a user program (Proposal No. 2017B0073). A portion of this research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

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title = "Hyperfine Splitting and Nuclear Spin Polarization in NdPd5Al2and Nd3Pd20Ge6",

abstract = "The hyperfine splitting of Nd nuclei in NdPd5Al2 was studied by means of high-resolution neutron spectroscopy. We observed inelastic peaks at hω = ±3 μeV and T = 0.3 K, originating from the hyperfine splitting in the magnetically ordered phase owing to the hyperfine interactions between Nd nuclei (I = 7=2) and the 4 f electrons with the Γ6 ground state composed of mainly |±9/2. At very low temperatures, the nuclear spin of Nd is polarized with an increasing occupation probability of low energy levels and contributes to the enhancement of the antiferromagnetic Bragg intensities; the elastic non-spin-flip channel is dominant. As an application of this phenomenon, we determined the Nd moment and hyperfine splitting from the temperature dependence of an antiferromagnetic Bragg intensity for Nd3Pd20Ge6.",

author = "Naoto Metoki and Kaoru Shibata and Masato Matsuura and Hideaki Kitazawa and Suzuki, {Hiroyuki S.} and Hiroki Yamauchi and Masato Hagihala and Frontzek, {Matthias D.} and Masaaki Matsuda",

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AU - Metoki, Naoto

AU - Shibata, Kaoru

AU - Matsuura, Masato

AU - Kitazawa, Hideaki

AU - Suzuki, Hiroyuki S.

AU - Yamauchi, Hiroki

AU - Hagihala, Masato

AU - Frontzek, Matthias D.

AU - Matsuda, Masaaki

PY - 2022/5/15

Y1 - 2022/5/15

N2 - The hyperfine splitting of Nd nuclei in NdPd5Al2 was studied by means of high-resolution neutron spectroscopy. We observed inelastic peaks at hω = ±3 μeV and T = 0.3 K, originating from the hyperfine splitting in the magnetically ordered phase owing to the hyperfine interactions between Nd nuclei (I = 7=2) and the 4 f electrons with the Γ6 ground state composed of mainly |±9/2. At very low temperatures, the nuclear spin of Nd is polarized with an increasing occupation probability of low energy levels and contributes to the enhancement of the antiferromagnetic Bragg intensities; the elastic non-spin-flip channel is dominant. As an application of this phenomenon, we determined the Nd moment and hyperfine splitting from the temperature dependence of an antiferromagnetic Bragg intensity for Nd3Pd20Ge6.

AB - The hyperfine splitting of Nd nuclei in NdPd5Al2 was studied by means of high-resolution neutron spectroscopy. We observed inelastic peaks at hω = ±3 μeV and T = 0.3 K, originating from the hyperfine splitting in the magnetically ordered phase owing to the hyperfine interactions between Nd nuclei (I = 7=2) and the 4 f electrons with the Γ6 ground state composed of mainly |±9/2. At very low temperatures, the nuclear spin of Nd is polarized with an increasing occupation probability of low energy levels and contributes to the enhancement of the antiferromagnetic Bragg intensities; the elastic non-spin-flip channel is dominant. As an application of this phenomenon, we determined the Nd moment and hyperfine splitting from the temperature dependence of an antiferromagnetic Bragg intensity for Nd3Pd20Ge6.

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Hyperfine Splitting and Nuclear Spin Polarization in NdPd₅Al₂and Nd₃Pd₂₀Ge₆

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