Unconventional heavy-fermion superconductivity of a new transuranium compound NpPd5Al2

• Aoki Dai

  Institute for Materials Research, Tohoku University

• Haga Yoshinori

  Advanced Science Research Center, Japan Atomic Energy Agency

• Matsuda Tatsuma D.

  Advanced Science Research Center, Japan Atomic Energy Agency

• Tateiwa Naoyuki

  Advanced Science Research Center, Japan Atomic Energy Agency

• Ikeda Shugo

  Advanced Science Research Center, Japan Atomic Energy Agency

• Homma Yoshiya

  Institute for Materials Research, Tohoku University

• Sakai Hironori

  Advanced Science Research Center, Japan Atomic Energy Agency

• Shiokawa Yoshinobu

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

• Yamamoto Etsuji

  Advanced Science Research Center, Japan Atomic Energy Agency

• Nakamura Akio

  Advanced Science Research Center, Japan Atomic Energy Agency

• Settai Rikio

  Graduate School of Science, Osaka University

• 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

• Unconventional Heavy-Fermion Superconductivity of a New Transuranium Compound NpPd<SUB>5</SUB>Al<SUB>2</SUB>

抄録

We succeeded in growing a new transuranium compound NpPd₅Al₂ with the tetragonal crystal structure by the Pb-flux method, and measured the electrical resistivity, specific heat, magnetic susceptibility and magnetization. NpPd₅Al₂ is found to be a paramagnetic heavy-fermion superconductor with strong coupling ΔC⁄γT_c=2.33 [T_c=4.9 K and γ=200 mJ/(K²·mol)]. The upper critical field H_c2 at 0 K is large and highly anisotropic: H_c2(0)=37 kOe for H||[100] and H_c2(0)=143 kOe for H||[001]. H_c2 is found to be strongly suppressed by the magnetic field, and the magnetization curve indicates a step-like increase at H_c2, which are due to the paramagnetic effect. The low-temperature electronic specific heat approximately follows the T³-dependence, indicating the existence of point nodes in the energy gap. The d-wave superconductivity with point nodes is most likely realized in this compound.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 76 (6), 063701-063701, 2007

  一般社団法人 日本物理学会

キーワード

• NpPd<SUB>5</SUB>Al<SUB>2</SUB>
• non-Fermi liquid
• paramagnetic effect
• heavy-fermion superconductivity

詳細情報

• CRID: 1390282679171045120
• NII論文ID: 130005296864
• NII論文ID: 110006342575
• NII論文ID: 210000106711
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.76.063701
• BIBCODE: 2007JPSJ...76f3701A
• ISSN: 13474073
• ISSN: 00319015
• ISSN: http://id.crossref.org/issn/00319015
• NDL書誌ID: 8769303
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8769303
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.76.063701
• 本文言語コード: en
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