Effect of valence fluctuation in heavy fermion superconductors under pressure

2013 Fiscal Year Final Research Report

• Project/Area Number: 23540419
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: University of the Ryukyus
• Principal Investigator: ASO Naofumi 琉球大学, 理学部, 准教授 (40313118)
• Project Period (FY): 2011 – 2013
• Keywords: 重い電子 / 超伝導 / 価数揺らぎ / 量子臨界点 / 低温物性 / 圧力磁化 / 中性子散乱

Research Abstract

In this investigation, we found new information of the relationship between superconductivity and antiferromagnetism in vicinity of quantum critical point by means of the physical properties measurements under pressure of a single-crystalline CeIrIn5, in which it has been pointed out that valence fluctuation takes place near the quantum criticality point by theory,
Next, we focus on a pressure-induced antiferromagnet YbCo2Zn20 with the smallest quantum critical pressure in Yb-based heavy fermion compounds. We succeeded in the single-crystalline doped YbCo2Zn20 and found new information of its pressure effect.

Research Products

• [Journal Article] Thermoelectric power in single-crystalline CeRhSi3 (2013)
  • Author(s): Hidekazu A. Tanaka, Naofumi Aso, Masato Hedo, Takao Nakama, Yoshinao Takaesu, Hiroki Iida, Noriaki Kimura, Haruyoshi Aoki
  • Journal Title: Journal of the Korean Physical Society Volume: Vol. 62 Pages: 2016-2018
  • DOI: 10.3938/jkps.62.2016
  • Peer Reviewed
• [Journal Article] Neutron Diffraction in the Pressure-Induced Superconducting Antiferromagnet CeIrSi3 (2012)
  • Author(s): N Aso, M Takahashi, H Yoshizawa, H Iida, N Kimura and H Aoki
  • Journal Title: Journal of Physics : Conference Series Volume: Vol. 400 Pages: 022003-1-4
  • DOI: 10.1088/1742-6596/400/2/022003
  • Peer Reviewed
• [Journal Article] Spin Density Wave Ordering in CeIrSi3 (2011)
  • Author(s): Naofumi Aso, Masaki Takahashi, Hideki Yoshizawa, Hiroki Iida, Noriaki Kimura, and Haruyoshi Aoki
  • Journal Title: Journal of the Physical Society of Japan Volume: Vol. 80 Pages: 095004-1-2
  • Peer Reviewed
• [Presentation] YbCo2Zn20の中性子散乱 (2014)
  • Author(s): 阿曽尚文, 松林和幸, 上床美也, 吉沢英樹
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学湘南キャンパス
  • Year and Date: 2014-03-28
• [Presentation] Physical properties under pressure in a heavy fermion superconductor CeIrIn5 (2013)
  • Author(s): N. Aso, Y. Tamaki, Y. Takaesu, K. Uchima, M. Hedo, T. Nakama, K. Matsubayashi, Y. Uwatoko, K. Deguchi, N. K. Sato
  • Organizer: The international conference on strongly correlated electron systems (SCES 2013)
  • Place of Presentation: 東京大学伊藤国際学術研究センター
  • Year and Date: 2013-08-06
• [Presentation] Neutron scattering studies in non-centrosymmetric superconductors CeTSi3 (T=Rh, Ir) (2013)
  • Author(s): Naofumi Aso
  • Organizer: The 12th Korea-Japan Meeting on Neutron Science
  • Place of Presentation: 琉球大学
  • Year and Date: 2013-02-04
• [Presentation] Physical properties under pressure in a heavy fermion superconductor CeIrIn5 (2012)
  • Author(s): Naofumi Aso, Y. Tamaki, Y. Takaesu, M. Hedo, T. Nakama, K. Uchima, K. Matsubayashi, Y. Uwatoko, Y. Ishikawa, K. Deguchi, N. K. Sato
  • Organizer: The 19th International Conference on Magnetism (ICM 2012)
  • Place of Presentation: Bexco, Busan, South Korea
  • Year and Date: 2012-07-09
• [Presentation] f電子系の高圧力下における中性子散乱 (2011)
  • Author(s): 阿曽尚文, 藤原哲也, 上床美也
  • Organizer: 第52回高圧討論会
  • Place of Presentation: 沖縄キリスト教学院
  • Year and Date: 2011-11-10
• [Presentation] Electrical Resistivity of a Heavy Fermion Superconductor CeIrIn5 under High Pressure up to 8.0 Gpa (2011)
  • Author(s): Y. Takaesu, N. Aso, Y. Tamaki, M. Hedo, T. Nakama, K. Uchima, K. Matsubayashi, Y. Uwatoko, Y. Ishikawa, K. Deguchi, N. K. Sato
  • Organizer: 23rd AIRAPT International Conference on High Pressure Science & Technology (AIRAPT-23)
  • Place of Presentation: Bhabha Atomic Research Centre, Mumbai, India
  • Year and Date: 2011-09-29
• [Presentation] 単結晶CeIrIn5の圧力下における磁化と輸送特性 (2011)
  • Author(s): 玉置優樹, 阿曽尚文, 高江洲義尚, 辺土正人, 仲間隆男, 松林和幸, 上床美也, 出口和彦, 佐藤憲昭
  • Organizer: 日本物理学会2011年秋季大会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-24