Heavy-fermion superconductivity probed by field-angle-resolved specific heat measurement under uniaxial pressure

• Project/Area Number: 25800186
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: KITTAKA Shunichiro 東京大学, 物性研究所, 助教 (80579805)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 重い電子系 / 非従来型超伝導 / 一軸性圧力効果 / 比熱測定 / 超伝導ギャップ / 超伝導 / 一軸性圧力 / 比熱 / 重い電子系超伝導 / 角度分解磁場中比熱

Outline of Final Research Achievements

Identification of the superconducting gap structure, which is closely related to the pairing interaction, is crucial to resolve the pairing mechanism of unconventional superconductivity. One of the powerful methods to determine the gap anisotropy is field-angle-resolved specific heat measurement. In this project, we have developed the apparatus to measure the field-angle-resolved specific heat under uniaxial pressure in order to uncover exotic features of heavy-fermion superconductivity. Furthermore, gap structures of various heavy-fermion superconductors have been investigated by this method at ambient pressure.

Research Products

• [Journal Article] Field-Orientation Dependence of Low-Energy Quasiparticle Excitations in the Heavy-Electron Superconductor UBe13 (2015)
  • Author(s): Y. Shimizu, S. Kittaka, T. Sakakibara, Y. Haga, E. Yamamoto, H. Amitsuka, Y. Tsutsumi, and K. Machida
  • Journal Title: Phys. Rev. Lett. Volume: 114 Issue: 14
  • DOI: 10.1103/physrevlett.114.147002
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Quantum phase near the saturation field in the S=1/2 frustrated spin ladder (2015)
  • Author(s): H. Yamaguchi, H. Miyagai, Y. Kono, S. Kittaka, T. Sakakibara, K. Iwase, T. Ono, T. Shimokawa, Y. Hosokoshi
  • Journal Title: Phys. Rev. B Volume: 91 Issue: 12
  • DOI: 10.1103/physrevb.91.125104
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] S=1/2 ferromagnetic-antiferromagnetic alternating Heisenberg chain in a zinc-verdazyl complex (2015)
  • Author(s): Hironori Yamaguchi, Yasuhiro Shinpuku, Tokuro Shimokawa, Kenji Iwase, Toshio Ono, Yohei Kono, Shunichiro Kittaka, Toshiro Sakakibara, Yuko Hosokoshi
  • Journal Title: Phys. Rev. B Volume: 91 Issue: 8
  • DOI: 10.1103/physrevb.91.085117
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Sharp magnetization jump at the first-order superconducting transition in Sr2RuO4 (2014)
  • Author(s): S. Kittaka, A. Kasahara, T. Sakakibara, D. Shibata, S. Yonezawa, Y. Maeno, K. Tenya, K.Machida
  • Journal Title: Physical Review B Volume: 90 Issue: 22
  • DOI: 10.1103/physrevb.90.220502
  • Peer Reviewed
• [Journal Article] Spin-Chirality-Driven Ferroelectricity on a Perfect Triangular Lattice Antiferromagnet (2014)
  • Author(s): H. Mitamura, R. Watanuki, K. Kaneko, N. Onozaki, Y. Amou, S. Kittaka, R. Kobayashi, Y. Shimura, I. Yamamoto, K. Suzuki, S. Chi, and T. Sakakibara
  • Journal Title: Phys. Rev. Lett. Volume: 113 Issue: 14 Pages: 1472021-5
  • DOI: 10.1103/physrevlett.113.147202
  • Peer Reviewed
• [Journal Article] Anisotropic Superconductivity of the Caged Compound Y5Rh6Sn18 with Unusual Normal-State Electrical Resistivity (2014)
  • Author(s): N. Kase, S. Kittaka, T. Sakakibara, and J. Akimitsu
  • Journal Title: JPS Conf. Proc Volume: 3 Pages: 015042-015042
  • DOI: 10.7566/jpscp.3.015042
  • Peer Reviewed
• [Journal Article] Field-induced incommensurate phase in the strong-rung spin ladder with ferromagnetic legs (2014)
  • Author(s): H. Yamaguchi, H. Miyagai, M. Yoshida, M. Takigawa, K. Iwase, T. Ono, N. Kase, K. Araki, S. Kittaka, T. Sakakibara, T. Shimokawa, T. Okubo, K. Okunishi, A. Matsuo, and Y. Hosokoshi
  • Journal Title: Phys. Rev. B Volume: 89 Issue: 22
  • DOI: 10.1103/physrevb.89.220402
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Multiband superconductivity with unexpected deficiency of nodal quasiparticles in CeCu2Si2 (2014)
  • Author(s): S. Kittaka, Y. Aoki, Y. Shimura, T. Sakakibara, S. Seiro, C. Geibel, F. Steglich, H. Ikeda, and K. Machida
  • Journal Title: Phys. Rev. Lett. Volume: 112 Issue: 6 Pages: 067002-067002
  • DOI: 10.1103/physrevlett.112.067002
  • Peer Reviewed
• [Journal Article] Thermodynamic Study of Nodal Structure and Multiband Superconductivity of KFe2As2 (2014)
  • Author(s): S. Kittaka
  • Journal Title: J. Phys. Soc. Jpn Volume: 83 Issue: 1 Pages: 013704-013704
  • DOI: 10.7566/jpsj.83.013704
  • Peer Reviewed
• [Journal Article] Fine-Tuning of Magnetic Interactions in Organic Spin Ladders (2014)
  • Author(s): H. Yamaguchi
  • Journal Title: Journal of Physical Society of Japan Volume: 83 Issue: 3 Pages: 33707-33707
  • DOI: 10.7566/jpsj.83.033707
  • Peer Reviewed
• [Journal Article] Verification of anisotropic s-wave superconducting gap structure in CeRu2 from low-temperature field-angle-resolved specific heat measurements (2013)
  • Author(s): Shunichiro Kittaka, Toshiro Sakakibara, Masato Hedo, Yoshichika Onuki, and Kazushige Machida
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: 12 Pages: 123706-123706
  • DOI: 10.7566/jpsj.82.123706
  • Peer Reviewed
• [Journal Article] Quasi-one-dimensional S=1/2 Heisenberg antiferromagnetic chain consisting of the organic radical p-Br-V (2013)
  • Author(s): K. Iwase, H. Yamaguchi, T. Ono, Y. Hosokoshi, T. Shimokawa, Y. Kono, S. Kittaka, T. Sakakibara, A. Matsuo, and K. Kindo
  • Journal Title: Phys. Rev. B Volume: 88 Issue: 18
  • DOI: 10.1103/physrevb.88.184431
  • Peer Reviewed
• [Journal Article] Various regimes of quantum behavior in an S=1/2 Heisenberg antiferromagnetic chain with fourfold periodicity (2013)
  • Author(s): H. Yamaguchi, T. Okubo, K. Iwase, T. Ono, Y. Kono, S. Kittaka, T. Sakakibara, A. Matsuo, K. Kindo, and Y. Hosokoshi
  • Journal Title: Phys. Rev. B Volume: 88 Issue: 17
  • DOI: 10.1103/physrevb.88.174410
  • Peer Reviewed
• [Journal Article] Unconventional Magnetic and Thermodynamic Properties of S=1/2 Spin (2013)
  • Author(s): H. Yamaguchi
  • Journal Title: Physical Review Letters Volume: 110 Issue: 15
  • DOI: 10.1103/physrevlett.110.157205
  • Peer Reviewed
• [Presentation] Heat capacity measurements on UBe13 in rotated magnetic fields: anisotropic response in the normal state and the absence of nodal quasiparticles (2015)
  • Author(s): Y. Shimizu, S. Kittaka, T. Sakakibara, Y. Haga, E. Yamamoto, H. Amitsuka, Y. Tsutsumi, and K. Machida
  • Organizer: The 20th International Conference on Magnetism (ICM2015)
  • Place of Presentation: Barcelona (Spain)
  • Year and Date: 2015-07-05 – 2015-07-10
• [Presentation] First-order superconducting transition of Sr2RuO4 investigated by magnetization and magnetic torque (2015)
  • Author(s): S. Kittaka, A. Kasahara, T. Sakakibara, D. Shibata, S. Yonezawa, Y. Maeno, K. Tenya, and K. Machida
  • Organizer: The 20th International Conference on Magnetism (ICM2015)
  • Place of Presentation: Barcelona (Spain)
  • Year and Date: 2015-07-05 – 2015-07-10
• [Presentation] 重い電子系化合物UBe13の高磁場常伝導状態及び超伝導相内における磁気異常の磁気応答 (2015)
  • Author(s): 清水悠晴、河野洋平、榊原俊郎、橘高俊一郎、芳賀芳範、山本悦嗣、網塚浩
  • Organizer: 日本物理学会第70回年次大会
  • Place of Presentation: 早稲田大学（東京都新宿区）
  • Year and Date: 2015-03-24
• [Presentation] カゴ状構造を有するY5Tr6Sn18 （Tr：遷移金属）の超伝導ギャップ構造の研究 (2015)
  • Author(s): 加瀬直樹、橘高俊一郎、榊原俊郎、照井祐輔、中野智仁、武田直也、秋光純
  • Organizer: 日本物理学会第70回年次大会
  • Place of Presentation: 早稲田大学（東京都新宿区）
  • Year and Date: 2015-03-22
• [Presentation] CeCu2Si2とUBe13における比熱と核磁気緩和率の温度依存性：多バンドフルギャップ超伝導の検証 (2015)
  • Author(s): 橘高俊一郎、堤康雅、清水悠晴、榊原俊郎、池田浩章、町田一成
  • Organizer: 日本物理学会第70回年次大会
  • Place of Presentation: 早稲田大学（東京都新宿区）
  • Year and Date: 2015-03-21
• [Presentation] 超伝導体Sr2RuO4の磁場方向を精密制御した極低温磁化測定及び磁気トルク測定 (2014)
  • Author(s): 笠原聡、橘高俊一郎、榊原俊郎、柴田大輔、米澤進吾、前野悦輝、天谷健一、町田一成
  • Organizer: 日本物理学会2014年秋季大会
  • Place of Presentation: 中部大学（愛知県春日井市）
  • Year and Date: 2014-09-10
• [Presentation] カゴ状構造を有する Sc5Tr6Sn18(Tr = Co, Rh, Ir)の超伝導特性 (2014)
  • Author(s): 加瀬直樹、照井祐輔、中野智仁、武田直也、橘高俊一郎、榊原俊郎、秋光純
  • Organizer: 日本物理学会2014年秋季大会
  • Place of Presentation: 中部大学（愛知県春日井市）
  • Year and Date: 2014-09-10
• [Presentation] 重い電子系化合物UBe13における超伝導対称性と磁気異常及び非フェルミ液体状態 (2014)
  • Author(s): 清水悠晴、橘高俊一郎、榊原俊郎、芳賀芳範、網塚浩、町田一成
  • Organizer: 日本物理学会2014年秋季大会
  • Place of Presentation: 中部大学（愛知県春日井市）
  • Year and Date: 2014-09-08
• [Presentation] 比熱測定から調べた空間反転対称性の破れた超伝導体CePt3Siの磁場方位依存性 (2014)
  • Author(s): 橘高俊一郎、河野洋平、榊原俊郎、Ernst Bauer
  • Organizer: 日本物理学会2014年秋季大会
  • Place of Presentation: 中部大学（愛知県春日井市）
  • Year and Date: 2014-09-07
• [Presentation] Gap symmetry of the heavy fermion superconductor CeCu2Si2 revisited: thermodynamic study (2014)
  • Author(s): S. Kittaka, Y. Aoki, Y. Shimura, T. Sakakibara, S. Seiro, C. Geibel, F. Steglich, H. Ikeda, Y. Tsutsumi, and K. Machida
  • Organizer: International Conference on Strongly Correlated Electron Systems 2014 (SCES2014)
  • Place of Presentation: Grenoble (France)
  • Year and Date: 2014-07-08
• [Presentation] Gap symmetry of the heavy fermion superconductor CeCu2Si2 revisited: thermodynamic study
  • Author(s): S. Kittaka
  • Organizer: The international Conference on Strongly Correlated Electron Systems 2014
  • Place of Presentation: Grenoble (France)
• [Presentation] 磁場中比熱測定から見たUBe13の超伝導ギャップ構造と異常な常伝導状態
  • Author(s): 橘高俊一郎
  • 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（神奈川県）
• [Presentation] Y5Tr6Sn18(Tr=Rh, Ir)の置換効果に対する異方的超伝導ギャップへの影響
  • Author(s): 加瀬直樹
  • 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（神奈川県）
• [Presentation] Field-orientation dependence of the specific heat of nodal superconductor KFe2As2
  • Author(s): S. Kittaka
  • Organizer: The international Conference on Strongly Correlated Electron Systems 2013
  • Place of Presentation: Ito International Research Center Conference, The University of Tokyo (Tokyo)
• [Presentation] Anisotropic superconducting gap of caged compound Y5Rh6Sn18 with strong intrinsic disorder
  • Author(s): N. Kase
  • Organizer: The international Conference on Strongly Correlated Electron Systems 2013
  • Place of Presentation: Ito International Research Center Conference, The University of Tokyo (Tokyo)
• [Presentation] 極低温磁化・比熱測定から見たCeCu2Si2の重い電子系超伝導
  • Author(s): 榊原俊郎
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学常三島キャンパス（徳島県）
• [Presentation] 不純物散乱の強い系で実現するY5Tr6Sn18(Tr=Rh,Ir)の異方的超伝導
  • Author(s): 加瀬直樹
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学常三島キャンパス（徳島県）
• [Presentation] UPt3の磁場中比熱
  • Author(s): 橘高俊一郎
  • Organizer: 「対称性の破れた凝縮系におけるトポロジカル量子現象」第12回集中連携研究会「Sr2RuO4の超伝導対称性とトポロジカル超伝導」
  • Place of Presentation: 京都大学(京都府)
• [Remarks] 研究室のホームページ
  • URL: http://sakaki.issp.u-tokyo.ac.jp/
• [Remarks] 個人のホームページ
  • URL: http://sakaki.issp.u-tokyo.ac.jp/user/kittaka/index.html
• [Remarks] 研究室のホームページ
  • URL: http://sakaki.issp.u-tokyo.ac.jp/
• [Remarks] 個人のホームページ
  • URL: http://sakaki.issp.u-tokyo.ac.jp/user/kittaka/index.html