Novel quantum phenomena in heavy fermion compounds studied by thermal expansion measurements

• Project/Area Number: 18540349
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Osaka University
• Principal Investigator: TAKEUCHI Tetsuya Osaka University, 低温センター, 助教 (90260629)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,800,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥600,000); Fiscal Year 2008: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2007: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2006: ¥1,200,000 (Direct Cost: ¥1,200,000)
• Keywords: 結晶反転対称性 / 超伝導 / 比熱 / 熱膨張 / CePt_3Si / RRhIn_5 / Rcu_2Si_2 / RCu_2Si_2(R:希土類) / LaPt_3Si / CeIrSi_3 / LaIrSi_3 / 圧力誘起超伝導 / RRhIn_5(R:希土類元素)

Research Abstract

本申請研究によるCePt_3Siの超伝導の研究から, 超伝導状態における比熱の残留電子比熱係数γsが約34 mJ/K^2 molと多結晶試料(γs~200 mJ/K^2 mol)に比べ非常に小さくなっており, 試料の純良度の大幅な向上に成功した. 育成に成功した単結晶における比熱の反強磁性転移と超伝導転移によるピークは, これまでの結果と比較し非常にシャープであった.
平成20年度は超伝導状態における残留電子比熱係数sが真に有限なのか, あるいは試料の純良性をさらに向上させればゼロに近づくのか否かを, 微小単結晶試料(~10 mg)を用いた比熱測定により研究した. 電気抵抗測定による残留抵抗比から純良度を判断した. その結果, 試料の純良度をさらに向上させた場合, 超伝導転移や反強磁性転移による比熱のピークは若干鋭くなるものの, 残留電子比熱係数に関しては大きな変化は観測されなかった. このことはCePt_3Siの超伝導状態では本質的に残留状態密度が存在することが明らかとなった.

Research Products

• [Journal Article] Magnetic Properties of Single Crystalline RCu2Si2(R : Rare Earth) (2009)
  • Author(s): N. D. Dung, Y. Ota, K. Sugiyama, T. D. Matsuda, Y. Haga, K. Kindo, M. Hagiwara, T. Takeuchi, R. Settai, and Y. Onuki
  • Journal Title: J. Phys. Soc. Jpn 78 Pages: 24712-24712
  • NAID: 210000107679
  • Peer Reviewed
• [Journal Article] Multiband superconductivity in heavy fermion compound CePt_3Si without inversion symmetry: An NMR study on a highquality single crystal (2009)
  • Author(s): H. Mukuda, S. Nishide, A. Harada, K. Iwasaki, M. Yogi, M. Yashima, Y. Kitaoka, M. Tsujino, T. Takeuchi, R. Settai, Y. Onuki, E. Bauer, K. M. Itoh, E. E. Haller
  • Journal Title: J. Phys. Soc. Jpn 78 Pages: 14705-14705
  • Peer Reviewed
• [Journal Article] Multiband superconductivity in heavy fermion compound CePt_3Si with out inversion symmetry : An NMR study on a high-quality single crystal (2009)
  • Author(s): H. Mukuda, T. Takeuchi, 他
  • Journal Title: J. Phys. Soc. Jpn. 78 Pages: 14705-14705
  • NAID: 110007042086
  • Peer Reviewed
• [Journal Article] Superconducting properties of CePt_3Si and CeIrSi_3 without inversion symmetry in the crystal structure (2008)
  • Author(s): Y. Onuki, Y. Miyauchi, M. Tsujino, Y. Ida, R. Settai, T. Takeuchi, N. Tateiwa, T. D. Matsuda, Y. Haga, H. Harima
  • Journal Title: J. Phys. Soc. Jpn. 77(Issue SUPPL. A) Pages: 37-42
  • Peer Reviewed
• [Journal Article] LnRhIn_5(Ln : ランタノイド元素)おける磁性と結晶場効果 (2008)
  • Author(s): 竹内徹也, Nguyen Van Hieu, 摂待力生, 杉山清寛, 松田達磨, 芳賀芳範, 大貫惇睦
  • Journal Title: 固体物理 43 Pages: 431-441
  • Peer Reviewed
• [Journal Article] Calorimetric study in single crystalline RCu_2Si_2(R : rare earth) (2008)
  • Author(s): Y. Takeda, N.D. Dung, Y. Nakano, T. Ishikura, S. Ikeda, T.D. Matsuda, E. Yamamoto, Y. Haga, T. Takeuchi, R. Settai, Y. Onuki
  • Journal Title: J. Phys. Soc. Jpn 77 Pages: 104710-104710
  • NAID: 110006969306
  • Peer Reviewed
• [Journal Article] Specific-heat study on the noncentrosymmetric heavy-fermion superconductor CePt_3Si (2008)
  • Author(s): T. Takeuchi, 他
  • Journal Title: Journal of the Korean Physical Society 53 Pages: 1041-1045
  • Peer Reviewed
• [Journal Article] LnRhln_5(Ln : ランタノイド元素)の磁性と結晶場効果 (2008)
  • Author(s): 竹内徹也, 他
  • Journal Title: 固体物理 43 Pages: 331-342
  • Peer Reviewed
• [Journal Article] Electrical and magnetic properties of R_3Al_<11> (R =La, Ce, Pr, and Nd) (2008)
  • Author(s): C. S. Garde, T. Takeuchi, 他
  • Journal Title: J. Phys. Soc. Jpn. 77 Pages: 124704-124704
  • NAID: 110007021679
  • Peer Reviewed
• [Journal Article] Synthesis and characterization of core-shell FePt@Ti-containing silica spherical nanocomposite as a catalyst earner for liquid-phase reactions (2008)
  • Author(s): K. Mori, T. Takeuchi, 他
  • Journal Title: Journal of Physical Chemistry C 122 Pages: 16478-16483
  • Peer Reviewed
• [Journal Article] Calorimetric study in single crystalline RCu_2Si_2 (R : rare earth) (2008)
  • Author(s): Y. Takeda, T. Takeuchi, 他
  • Journal Title: J. Phys. Soc. Jpn. 77 Pages: 104710-104710
  • NAID: 110006969306
  • Peer Reviewed
• [Journal Article] Superconducting properties of CePt_3Si and CeIrSi_3 without inversion symmetry inthe crystal structure (2008)
  • Author(s): Y. Onuki, T. Takeuchi, 他
  • Journal Title: J. Phys. Soc. Jpn. Supp. A 77 Pages: 37-42
  • Peer Reviewed
• [Journal Article] Huge upper critical field and electronic instability in pressure-induced superconductor CeIrSi_3 without inversion symmetry in the crystal structure (2008)
  • Author(s): R. Settai, T. Takeuchi, 他
  • Journal Title: J. Phys. Soc. Jpn. 77 Pages: 73705-73705
  • NAID: 110006821286
  • Peer Reviewed
• [Journal Article] Magnetic and superconducting properties of CeTX_3 (T : Transition metal and X : Siand Ge)with non-centrosymmetric crystal structure (2008)
  • Author(s): T. Kawai, T. Takeuchi, 他
  • Journal Title: J. Phys. Soc. Jpn. 77 Pages: 64716-64716
  • Peer Reviewed
• [Journal Article] Pressure-induced superconductivity in antiferromagnet CePd_5Al_2 (2008)
  • Author(s): F. Honda, T. Takeuchi, 他
  • Journal Title: J. Phys. Soc. Jpn. 77 Pages: 43701-43701
  • NAID: 110006649401
  • Peer Reviewed
• [Journal Article] Magnetic Properties and Crystalline Electric Field Scheme in RRhIn5(R : Rare Earth) (2007)
  • Author(s): N.V. Hieu, T. Takeuchi, H. Shishido, C. Tonohiro, T. Yamada, H. Nakashima, K. Sugiyama, R. Settai, T.D. Matsuda, Y. Haga, M. Hagiwara, K. Kindo, S. Araki, Y. Nozue and Y. Onuki
  • Journal Title: J. Phys. Soc. Jpn 76 Pages: 64702-64702
  • NAID: 210000106737
  • Peer Reviewed
• [Journal Article] 空間反転対称性が破れた重い電子系CePt_3Siの超伝導 (2007)
  • Author(s): 竹内徹也, 摂待力生, 大貫惇睦, 播磨尚朝
  • Journal Title: 固体物理 Vol.42 Pages: 431-441
  • Peer Reviewed
• [Journal Article] 空間反転対称性が破れた重い電子系CePt_3Siの超伝導 (2007)
  • Author(s): 竹内徹也
  • Journal Title: 固体物理 42 Pages: 431-441
  • Peer Reviewed
• [Journal Article] Specific Heat and de Haas-van Alphen Experiments on the Heavy-Fermion Superconductor CePt_3Si (2007)
  • Author(s): 竹内徹也
  • Journal Title: Journal of Physical Society of Japan 76 Pages: 14702-14702
  • NAID: 110006151552
  • Peer Reviewed
• [Journal Article] High-Quality Single Crystal Growth and Unique Electronic States in Cerium and Uranium Compounds (2007)
  • Author(s): 大貫惇睦
  • Journal Title: J. Phys.: Condens. Matter 19 Pages: 125203-125203
  • Peer Reviewed
• [Journal Article] Recent Advances in Ce-Based Heavy-Fermion Superconductivity and Fermi Surface Properties (2007)
  • Author(s): 摂待力生
  • Journal Title: Journal of Physical Society of Japan 76 Pages: 51003-51003
  • Peer Reviewed
• [Journal Article] Specific Heat and de Haas-van Alphen Experiments on the Heavy-Fermion Superconductor CePt_3Si (2007)
  • Author(s): T.Takeuchi, T.Yasuda, M.Tsujino, H.Shishido, R.Settai, H.Harima, Y.Onuki
  • Journal Title: Journal of Physical Society of Japan 76 Pages: 14702-14702
  • NAID: 110006151552
• [Journal Article] Magnetic and Electrical Properties in CePtSi_3 without Inversion Symmetry in the Crystal Structure (2007)
  • Author(s): T.Kawai, Y.Okuda, H.Shishido, A.Thamizhavel, T.D.Matsuda, Y.Haga, M.Nakashima, T.Takeuchi, M.Hedo, Y.Uwatoko, R.Settai, Y.Onuki
  • Journal Title: Journal of Physical Society of Japan 76 Pages: 14710-14710
  • NAID: 110006151560
• [Journal Article] Crystal growth and magnetic property of a new compound CeAu_4Si_2 (2006)
  • Author(s): H.Nakashima, A.Thamizhavel, T.D.Matsuda, Y.Haga, T.Takeuchi, K.Sugiyama, R.Settai, Y.Onuki
  • Journal Title: J. OF ALLOYS AND COMPOUNDS 424 Pages: 7-12
• [Journal Article] Unique magnetic properties of NdRhIn_5, TbRhIn_5, DyRhIn_5, and HoRhIn_5 (2006)
  • Author(s): N.Van Hieu, H.Shishido, T.Takeuchi, A.Thamizhavel, H.Nakashima, K.Sugiyama, R.Settai, T.D.Matsuda, Y.Haga, M.Hagiwara, K.Kindo, Y.Onuki
  • Journal Title: Journal of Physical Society of Japan 75 Pages: 74708-74708
  • NAID: 10018799469
• [Journal Article] Pressure-induced heavy-fermion superconductivity in antiferromagnet CeIrSi_3 without inversion symmetry (2006)
  • Author(s): I.Sugitani, Y.Okuda, H.Shishido, T.Yamada, A.Thamhavel, E.Yamamoto, T.D.Matsuda, Y.Haga, T.Takeuchi, R.Settai, Y.Onuki
  • Journal Title: Journal of Physical Society of Japan 75 Pages: 43703-43703
  • NAID: 110004729246
• [Presentation] The effect of crystalline electric field on magnetic properties in RCu_2Si_2(R : rare earth) (2009)
  • Author(s): N.D. Dung
  • Organizer: 日本物理学会
  • Place of Presentation: 岩手大学
  • Year and Date: 2009-09-21
• [Presentation] 結晶の空間反転対称性が破れたCaPtSi_3の単結晶育成と超伝導 (2009)
  • Author(s): 竹内徹也
  • Organizer: 日本物理学会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-30
• [Presentation] YbCu_2Si_2とYbCu_2Ge_2の電子状態 (2008)
  • Author(s): 石倉達朗, 竹内徹也, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-21
• [Presentation] 空間反転対称性をRPt_3SiとRIrSi_3における超伝導の研究 (2008)
  • Author(s): 竹内徹也
  • Organizer: 日本物理学会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-24
• [Presentation] Effect of magnetic field and pressure on the heavy-fermion superconductor CePt_3Si (2007)
  • Author(s): 竹内徹也
  • Organizer: Magnetic and Superconducting Materials Conference 2007
  • Place of Presentation: Khorezm Mamun Academy (Uzbekistan)
  • Year and Date: 2007-09-28
• [Presentation] CePt_3Siの圧力下における超伝導 (2007)
  • Author(s): 辻野真彦
  • Organizer: 日本物理学会
  • Place of Presentation: 北海道大学
  • Year and Date: 2007-09-22
• [Presentation] Specific heat study on the heavy-fermion superconductor CePt_3Si (2007)
  • Author(s): 竹内徹也
  • Organizer: The 10th Asia Pacific Physics Conference
  • Place of Presentation: 韓国(ポーハン工科大学)
  • Year and Date: 2007-08-21
• [Presentation] Magnetism and Crystalline Electric Field in RRhIn_5 (R: rare earth) (2007)
  • Author(s): 竹内徹也
  • Organizer: Strongly Correlated Electron Systems 2007
  • Place of Presentation: ヒューストン(米国)
  • Year and Date: 2007-05-18
• [Presentation] CePt_3Siの純良単結晶育成と超伝導 (2007)
  • Author(s): 辻野真彦
  • Organizer: 日本物理学会
  • Place of Presentation: 鹿児島大学
  • Year and Date: 2007-03-18
• [Presentation] CePt_3Siにおける磁性と超伝導の比熱による研究II (2006)
  • Author(s): 竹内徹也
  • Organizer: 日本物理学会
  • Place of Presentation: 千葉大学
  • Year and Date: 2006-09-23
• [Presentation] CePt_3Siにおける磁性と超伝導の比熱による研究 (2006)
  • Author(s): 竹内徹也
  • Organizer: 日本物理学会
  • Place of Presentation: 愛媛大学・松山大学
  • Year and Date: 2006-03-27
• [Presentation] CeTX_3(T : 遷移金属, X ; Si, Ge)の磁性 (2006)
  • Author(s): 下田哲哉
  • Organizer: 日本物理学会
  • Place of Presentation: 愛媛大学・松山大学
  • Year and Date: 2006-03-27
• [Presentation] Metamagnetic transition in RRhIn5 compounds(R : Nd, Tb, Dy and Ho) (2006)
  • Author(s): N. V. Hieu
  • Organizer: 日本物理学会
  • Place of Presentation: 愛媛大学・松山大学
  • Year and Date: 2006-03-27