Transport Properties of Ce₂Co₇B₃in Magnetic Field

• Notsu Shikou

  Faculty of Science, University of the Ryukyus

• Shimoji Yuko

  Faculty of Science, University of the Ryukyus

• Hedo Masato

  Institute of Solid State Physics, University of Tokyo

• Uwatoko Yoshiya

  Institute of Solid State Physics, University of Tokyo

• Nakama Takao

  Faculty of Science, University of the Ryukyus

• Ido Hideaki

  Department of Applied Physics, Tohoku Gakuin University

• Yagasaki Katsuma

  Faculty of Science, University of the Ryukyus

書誌事項

タイトル別名

• Transport Properties of Ce2Co7B3 in Magnetic Field

抄録

Thermopower S, resistivity ρ and magnetization M of Ce₂Co₇B₃ have been measured in magnetic fields up to 15 T at temperature range from 2 to 1000 K. The magnetic field dependence of S(H) and ρ(H) changes drastically at spin-flop critical field H_S=6.0 T in 4.2 K. A very large negative magneto-resistance is observed, 35% in 15 T at 4.0 K, suggesting large spin–spin interaction between s and d electrons. Magnetic phase transitions in temperature and field are experimentally obtained, a magnetic phase diagram is established. The S(T) measured up to 1000 K suggests that a DOS peak exists at 250 K apart from Fermi level (ε_F) in energy. Below H_S, a negative peak exists on the S(T) curve around 20 K, which disappears suddenly at H_S. The negative peak is estimated coming from a super-zone boundary on ε–k curve caused by anti-ferromagnetic periodicity. The DOS below and above H_S have been estimated from experimental S(T) in terms of Mott’s two band s–d scattering model.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 75 (4), 044714-, 2006

  一般社団法人 日本物理学会

キーワード

• Ce<SUB>2</SUB>Co<SUB>7</SUB>B<SUB>3</SUB>
• thermopower
• resistivity
• magnetization
• spin-flop transition
• giant magneto-resistance
• super-zone boundary
• Brilouin zone

詳細情報

• CRID: 1390001204189557760
• NII論文ID: 110004729280
• NII論文ID: 210000106107
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.75.044714
• BIBCODE: 2006JPSJ...75d4714N
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 7882535
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7882535
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.75.044714
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
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