2010 Fiscal Year Final Research Report
Elucidation of competition between magnetism and conductivity in actinide chalcogenide compounds
| Project/Area Number |
20740210
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | University of Hyogo |
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Principal Investigator |
SHUGO Ikeda University of Hyogo, 大学院・物質理学研究科, 助教 (80414580)
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| Project Period (FY) |
2008 – 2011
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| Keywords | 巨大磁気抵抗 / 金属絶縁体転移 / 5f電子 / カルコゲナイド化合物 |
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| Research Abstract |
We studied the physical properties of UXS (X:S, Se, Te) with an orthorhombic crystal structure by measuring its magnetization, magnetic susceptibility, specific heat, and electrical resistivity under magnetic field and pressure. The insulating resistivity of β-US_2 markedly changes to a metallic one under a high pressure of 8 GPa similarly to that of the semimetallic Ising-type ferromagnet UTeS with a Curie temperature TC=87 K.A resistivity anomaly was also observed in the temperature dependence of the resistivity under pressure, most likely corresponding to ferromagnetic ordering. From these experimental results, it was concluded that β-US_2 is in the vicinity of ferromagnetic ordering at ambient pressure. Furthermore, we found that the easy-axis magnetization at low fields for H // [001] consists of a linear magnetization based on the 5f-CEF scheme and a ferromagnetic-like magnetization with a saturated moment of 0.042α_β/U. The latter magnetization was analyzed on the basis of the ferromagnetic cluster and discussed from the viewpoint of the magnetic polaron.
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[Journal Article] Possible Existence of Magnetic Polaron in Nearly Ferromagnetic Semiconductor β-US_22009
Author(s)
S.ikeda, H.Sakai, N.Tateiwa, T.D.Matusda, D.Aoki, Y.Homma, E.Yamamoto, A.Nakamura, Y.Shiokwa, Y.Ota, K.Sugiyama, M.Hagiwara, K.Kindo, K.Matsubayashi, M.Hedo, Y.Uwatoko, Y.Haga, Y.Onuki.
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Journal Title
J.Phys.Soc.Jpn. 78
Pages: 114704
Peer Reviewed
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[Remarks] ホームページ等
