Study of Quantum state under high pressure and low temperature using new type of pressure cell

• Project/Area Number: 22740231
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Kobe University
• Principal Investigator: KOTEGAWA Hisashi 神戸大学, 理学研究科, 准教授 (30372684)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2011: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2010: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 高圧 / 低温 / NMR / 高圧セル

Research Abstract

We looked for the quantum state at low temperature using new type of pressure cell. In ferromagnet UGe_2, we specified the position of quantum critical endpoint which appears under high pressure and magnetic field. This quantum critical endpoint recently attracts attention as a new type of critical point at zero temperature. We also investigated the pressure variation of the transition temperature of perovskite-Fe-based superconductors.

Research Products

• [Journal Article] Pressure Dependence of Superconducting Transition Temperature on Perovskite-Type Fe-Based Superconductors and NMR Study of Sr_2VFeAsO_3 (2011)
  • Author(s): H. Kotegawa, et al.
  • Journal Title: Journal of the Physical Society of Japan Volume: 78 Pages: 14712-14712
  • Peer Reviewed
• [Journal Article] Evolution toward Quantum Critical End Point in UGe_2 (2011)
  • Author(s): H. Kotegawa, et al.
  • Journal Title: J. Phys. Soc. Jpn. Volume: 80 Pages: 83703-83703
  • Peer Reviewed
• [Journal Article] Strong Longitudinal Magnetic Fluctuations near Critical End Point in UCoAl : A^<59> Co-NMR Study (2011)
  • Author(s): H. Nohara, H. Kotegawa, et al.
  • Journal Title: J. Phys. Soc. Jpn. Volume: 80 Pages: 93707-93707
  • NAID: 40018996901
  • Peer Reviewed
• [Journal Article] Pressure-Induced Structural Phase Transitions in UIr (2011)
  • Author(s): H. Kotegawa, et al.
  • Journal Title: Phys. Rev. Volume: B84 Pages: 54524-54524
  • Peer Reviewed
• [Journal Article] Evolution toward Quantum Critical End point in Uge_2 (2011)
  • Author(s): Hisashi Kotegawa, et al
  • Journal Title: J.Phys.Soc.Jpn. Volume: 80 Issue: 8 Pages: 083703-083703
  • DOI: 10.1143/jpsj.80.083703
  • Peer Reviewed
• [Journal Article] Strong Longitudinal Magnetic Fluctuations Near Critical End Point in UCoAl : A ^<59>Co-NMR Study (2011)
  • Author(s): H.Nohara, H.Kotegawa, et al
  • Journal Title: Journal of the Physical Society of Japan Volume: 80 Issue: 9 Pages: 93707-93707
  • DOI: 10.1143/jpsj.80.093707
  • Peer Reviewed
• [Journal Article] Pressure Dependence of Superconducting Transition Temperature on Perovskite-Type Fe-Based Superconductors and NMR Study of Sr_2VFeAsO_3 (2010)
  • Author(s): H.Kotegawa, Y.Tao, H.Tou, K.Murata, H.Ogino, S.Horii, K.Kishio, J.Shimoyama
  • Journal Title: Journal of the Physical Society of Japan Volume: 78
  • Peer Reviewed
• [Journal Article] Anion height dependence of T_c for the Fe-based superconductor (2010)
  • Author(s): Y.Mizuguchi, Y.Hara, K.deguchi, S.Tsuda, T.Yamaguchi, K.Takeda, H.Kotegawa, H.Tou, Y.Takano
  • Journal Title: Superconductor Science & Technology Volume: 23
  • Peer Reviewed
• [Journal Article] Superconductivity in a new iron pnictide oxide (Fe_2As_2)(Sr4(Mg,Ti)_2O_6) (2010)
  • Author(s): S.Sato, H.Ogino, N.Kawaguchi, Y.Katsura, K.Kishio, J.Shimoyama, H.Kotegawa, H.Tou
  • Journal Title: Superconductor Science & Technology Volume: 23
  • Peer Reviewed
• [Presentation] CeIr_3Si_2とCeIr_3B_2の圧力下における電気抵抗率測定 (2012)
  • Author(s): 久保田和宏、小手川恒, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 関西学院大学(兵庫県)
  • Year and Date: 2012-03-25
• [Presentation] 量子臨界終点をもつUCoAlの圧力下NMR (2012)
  • Author(s): 野原弘貴、小手川恒, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 関西学院大学(兵庫県)
  • Year and Date: 2012-03-25
• [Presentation] 量子臨界終点をもつUCoAlの圧力下NMR測定 (2012)
  • Author(s): 野原弘貴、小手川恒, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 関西学院大学
• [Presentation] UCOAlのメタ磁性転移近傍におけるNMR測定 (2011)
  • Author(s): 野原弘貴、小手川恒, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 富山大学(富山県)
  • Year and Date: 2011-09-23
• [Presentation] UCOAlのメタ磁性転移近傍におけるNMR測定 (2011)
  • Author(s): 野原弘貴、小手川恒, 他
  • Organizer: 新学術領域、研究会
  • Place of Presentation: 東大物性研究所(東京都)
  • Year and Date: 2011-06-24
• [Presentation] Uge_2の量子臨界終点:圧力下ホール効果 (2011)
  • Author(s): 小手川恒, 他
  • Organizer: 新学術領域、研究会
  • Place of Presentation: 東大物性研究所(東京都)
  • Year and Date: 2011-06-24
• [Presentation] UGe_2の量子臨界終点:圧力下ホール効果測定 (2011)
  • Author(s): 小手川恒, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 新潟大学(新潟県)
  • Year and Date: 2011-03-25
• [Presentation] UCoAlのメタ磁性転移近傍におけるNMR測定 (2011)
  • Author(s): 野原弘貴、小手川恒, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 富山大学
• [Presentation] UCoAlのメタ磁性転移近傍におけるNMR測定 (2011)
  • Author(s): 野原弘貴、小手川恒, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 新潟大学
• [Presentation] ペロブスカイト層を含む鉄系超伝導体の高圧電気抵抗測定とNMR測定II (2011)
  • Author(s): 冨田佑介, 田尾幸樹, 小手川恒, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 新潟大学
• [Presentation] UGe_2の量子臨界終点:圧力下ホール効果測定 (2011)
  • Author(s): 小手川恒, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 新潟大学
• [Presentation] NMR and Resistivity Measurements under Pressure in SrFe_2As_2, FeSe, and Perovskite-Type Fe-based Superconductors (2010)
  • Author(s): 小手川恒, 他
  • Organizer: Asian Conference on High Pressure Research
  • Place of Presentation: くにびきメッセ(島根県)(招待講演)
  • Year and Date: 2010-11-12
• [Presentation] 大型インデンターセルを用いたSrFe_2As_2の高圧NMR (2010)
  • Author(s): 川添隆行、小手川恒, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 大阪府立大学(大阪府)
  • Year and Date: 2010-09-23