Possible Existence of Magnetic Polaron in Nearly Ferromagnetic Semiconductor β-US<sub>2</sub>

Ikeda, Shugo; Sakai, Hironori; Tateiwa, Naoyuki; Matsuda, Tatsuma D.; Aoki, Dai; Homma, Yoshiya; Yamamoto, Etsuji; Shiokawa, Yoshinobu; Ota, Yoshiyuki; Sugiyama, Kiyohiro; Hagiwara, Masayuki; Kindo, Koichi; Matsubayashi, Kazuyuki; Hedo, Masato; Uwatoko, Yoshiya; Haga, Yoshinori; Ōnuki, Yoshichika

doi:10.1143/jpsj.78.114704

Cited by 18 publications

(34 citation statements)

References 16 publications

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“…The obtained data agree well with the previous data [4]. This suggest that there is no significant sample dependence in the crystals grown from bromine transport.…”

Section: Methodssupporting

confidence: 91%

“…Magnetization follows a Curie-Weiss law above 50 K. It deviates from this at lower temperature and approaches a constant value in strong magnetic field. This behavior is consistent with ground state crystal field singlet as discussed in the previous paper [4]. The magnetization has significant field dependence below about 50 K. This behavior cannot be explained by the crystal-field.. As mentioned in the introduction, magnetic polaron model provides one possible explanations.…”

Section: Methodssupporting

confidence: 89%

“…A previous magnetization study on single crystal β-US 2 suggested that the anisotropic paramagnetic behavior with saturation at low temperature can be interpreted via crystal field effects on U 4+ [4]. The proposed crystal field levels consist of a singlet ground state with an excited quasidoublet above 90 K, which is consistent with magnetic anisotropy as well as magnetic specific heat.…”

Section: Introductionsupporting

confidence: 68%

“…The analyses of the magnetization curve at 2 K gave 35.5 to 140 µ B /U depending on the model. As described in [4], the magnetization behavior is quite well fit with a paramagnetic cluster model. To examine this behavior, we try to normalize the magnetization using T /H as independent variable.…”

Section: Methodsmentioning

confidence: 54%

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Analysis of Magnetization Behavior in Magnetic Semiconductor β-US₂

Yamamoto¹,

Tateiwa²,

Haga³

et al. 2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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β-US 2 with orthorhombic structure is narrow gap semiconductor and does not order magnetically. We study the magnetic properties of β US 2 in detail by measuring magnetic susceptibility under a magnetic field. The magnetization is understood as formation of a singlet ground state due to the crystal field effect. But the magnetization has a significant field dependence under 50 K. This behavior cannot be explained by simple crystal field effects. Analyses based on the magnetic polaron model are discussed.

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“…The obtained data agree well with the previous data [4]. This suggest that there is no significant sample dependence in the crystals grown from bromine transport.…”

Section: Methodssupporting

confidence: 91%

Section: Methodssupporting

confidence: 89%

Section: Introductionsupporting

confidence: 68%

Section: Methodsmentioning

confidence: 54%

See 2 more Smart Citations

Analysis of Magnetization Behavior in Magnetic Semiconductor β-US₂

Yamamoto¹,

Tateiwa²,

Haga³

et al. 2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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“…The details of the sample preparation are given in the ref. 2. The magnetization under high pressure was measured by piston cylinder type and indenter cells in a commercial SQUID magnetometer (Quantum Design's MPMS).…”

Section: Methodsmentioning

confidence: 99%

Non-magnetic to Magnetic Transition under High Pressure in Narrow-Gap Semiconductor β-US₂

et al. 2011

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We have measured the magnetization of an uranium chalcogenide compound β-US 2 under high pressure by piston cylinder and indenter type cells up to 2.42 GPa in a commercial SQUID magnetometer. The compound is a narrow-gap semiconductor that does not order magnetically down to 0.3 K at 1 bar. The appearance of a pressure-induced phase above 2 GPa was suggested by a previous study with the electrical resistivity measurement under high pressure. In this study, it was found that a ferromagnetic state is induced above 1 GPa. The pressure phase diagram were obtained. The values of the spontaneous magnetic moment at 0 K are less than 0.1 µ B /U, suggesting that the pressure-induced phase is a very weak ferromagnetic state. Considering the CEF singlet ground state in β-US 2 , it is suggest that the ferromagnetic state is an "induced-magnetic phase" often observed in some praseodymium compounds such as Pr 3 Tl. The experimental results are discussed in terms of the mean field theory.

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Rare Bird: U⁺⁵ in Uranium Chalcogenides

Berseneva,

Klepov,

Kashem

et al. 2024

Chem. Mater.

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Chalcogen environments tend to stabilize low oxidation states, thus making the +5 oxidation state in uranium chalcogenides extremely rare. Having one unpaired electron, the magnetism of U+5, 5f1, is of significant interest; however, it is underexplored due to a scarcity of examples. Three related all-U+5 chalcogenides, Na2Cu5US6, Na3Cu4US6, and Na3Cu4USe6, were obtained as single crystals via the flux-assisted boron chalcogen mixture method as part of a broader investigation of the Na–Cu–U–Q (Q = S and Se) systems. To test the formation of the Se-analog of Na2Cu5US6, we performed in situ high-temperature powder X-ray diffraction using sealed capillaries; this approach demonstrated the formation and presence of only Na3Cu4USe6 and not “Na2Cu5USe6” in the reaction mixture. In addition to assigning oxidation states using charge balance and the sample composition, oxidation states of copper, +1, and uranium, +5, in Na2Cu5US6 were also determined via X-ray absorption near edge spectroscopy. Magnetic properties were investigated on both bulk powder samples of Na2Cu5US6 and Na3Cu4UQ 6 (Q = S and Se) and millimeter-size single crystals of Na2Cu5US6, where magnetic susceptibility and magnetization vs field measurements revealed antiferromagnetic behavior of Na2Cu5US6 and Na3Cu4UQ 6 (Q = S and Se) with a T N of 4.7, 3.4, and 5.9 K, respectively. Finally, a broad discussion of the effective magnetic moment of U+5, which is significantly smaller, 1.06 μB in Na2Cu5US6 and 1.08 μB in Na3Cu4USe6, than predicted by spin-only (1.73 μB) and total angular momentum (2.54 μB) models. The fact that only about 20 compositions of such materials are currently known, highlights the need to explore additional compositions containing uranium in rare oxidation states before it will be possible to understand the magnetic properties of such materials more fully.

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Possible Existence of Magnetic Polaron in Nearly Ferromagnetic Semiconductor β-US₂

Cited by 18 publications

References 16 publications

Analysis of Magnetization Behavior in Magnetic Semiconductor β-US₂

Analysis of Magnetization Behavior in Magnetic Semiconductor β-US₂

Non-magnetic to Magnetic Transition under High Pressure in Narrow-Gap Semiconductor β-US₂

Rare Bird: U⁺⁵ in Uranium Chalcogenides

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Possible Existence of Magnetic Polaron in Nearly Ferromagnetic Semiconductor β-US2

Cited by 18 publications

References 16 publications

Analysis of Magnetization Behavior in Magnetic Semiconductor β-US2

Analysis of Magnetization Behavior in Magnetic Semiconductor β-US2

Non-magnetic to Magnetic Transition under High Pressure in Narrow-Gap Semiconductor β-US2

Rare Bird: U+5 in Uranium Chalcogenides

Contact Info

Product

Resources

About

Possible Existence of Magnetic Polaron in Nearly Ferromagnetic Semiconductor β-US₂

Analysis of Magnetization Behavior in Magnetic Semiconductor β-US₂

Analysis of Magnetization Behavior in Magnetic Semiconductor β-US₂

Non-magnetic to Magnetic Transition under High Pressure in Narrow-Gap Semiconductor β-US₂

Rare Bird: U⁺⁵ in Uranium Chalcogenides