Possible existence of magnetic polaron in nearly ferromagnetic semiconductor β-US2

• Ikeda Shugo

  Advanced Science Research Center, Japan Atomic Energy Agency Graduate School of Material Science, University of Hyogo

• Sakai Hironori

  Advanced Science Research Center, Japan Atomic Energy Agency

• Tateiwa Naoyuki

  Advanced Science Research Center, Japan Atomic Energy Agency

• Matsuda Tatsuma D.

  Advanced Science Research Center, Japan Atomic Energy Agency

• Aoki Dai

  Institute for Materials Research, Tohoku University

• Homma Yoshiya

  Institute for Materials Research, Tohoku University

• Yamamoto Etsuji

  Advanced Science Research Center, Japan Atomic Energy Agency

• Nakamura Akio

  Advanced Science Research Center, Japan Atomic Energy Agency

• Shiokawa Yoshinobu

  Advanced Science Research Center, Japan Atomic Energy Agency Institute for Materials Research, Tohoku University

• Ota Yuuki

  Graduate School of Science, Osaka University

• Sugiyama Kiyohiro

  Graduate School of Science, Osaka University

• Hagiwara Masayuki

  KYOKUGEN, Osaka University

• Kindo Koichi

  Institute for Solid State Physics, University of Tokyo

• Matsubayashi Kazuyuki

  Institute for Solid State Physics, University of Tokyo

• Hedo Masato

  Faculty of Science, University of the Ryukyus

• Uwatoko Yoshiya

  Institute for Solid State Physics, University of Tokyo

• Haga Yoshinori

  Advanced Science Research Center, Japan Atomic Energy Agency

• Onuki Yoshichika

  Advanced Science Research Center, Japan Atomic Energy Agency Graduate School of Science, Osaka University

書誌事項

タイトル別名

• Possible Existence of Magnetic Polaron in Nearly Ferromagnetic Semiconductor β-US<SUB>2</SUB>
• Possible existence of magnetic polaron in nearly ferromagnetic semiconductor v US2

抄録

We studied the magnetic properties of the paramagnet β-US₂ with an orthorhombic crystal structure by measuring its magnetization, magnetic susceptibility, specific heat, and electrical resistivity under magnetic field and pressure. The 5f-crystalline electric field (CEF) scheme was determined from the experimental results: a singlet in the ground state and a pseudo-doublet in the first excited state, separated by 85 and 91 K from the ground state. The insulating resistivity 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 T_C=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-US₂ 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 0.042 μ_B/U. The latter magnetization was analyzed on the basis of the ferromagnetic cluster and discussed from the viewpoint of the magnetic polaron.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 78 (11), 114704-114704, 2009

  一般社団法人 日本物理学会

キーワード

• β-US<SUB>2</SUB>
• USeS
• UTeS
• CEF
• high pressure
• magnetic cluster
• magnetic polaron

詳細情報

• CRID: 1390001204196837632
• NII論文ID: 130005437242
• NII論文ID: 40016829637
• NII論文ID: 210000108077
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.78.114704
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 10439267
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10439267
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.78.114704
• 本文言語コード: en
• データソース種別:
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  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可