Quantum critical behaviors induced by a magnetic frustration in 4f hole systems under pressures

• Project/Area Number: 25400375
• 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: Hiroshima University
• Principal Investigator: Umeo Kazunori 広島大学, 自然科学研究支援開発センター, 准教授 (10223596)
• Co-Investigator(Renkei-kenkyūsha): TAKABATAKE Toshiro 広島大学, 大学院先端物質科学研究科, 教授 (40171540)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 高圧力 / 量子臨界現象 / ４fホール系 / フラストレーション / 磁気フラストレーション / 4fホール系 / 非フェルミ液体的挙動 / 比熱 / 磁化

Outline of Final Research Achievements

We developed a low-temperature AC calorimeter for measuring the absolute value of specific heat under pressures up to 10 GPa.
In YbAgGe, Yb atoms form a quasi-kagome lattice in the hexagonal c-plane. With increasing x of YbAg1-xAuxGe, We found that the magnetic ordering temperature at 0.8 K increases up to 1.3 K for x = 0.11, while the Kondo temperature rises. These observations suggest that the magnetic frustration in the Yb sublattice is released by the atomic disorder in the nonmagnetic Ag-Ge sublattice. We have investigated the uniaxial and hydrostatic pressure effects on the antiferromagnetic order at TN=4.2 K of YbCuGe with a triangular lattice of Yb ions. For P//a up to 0.17 GPa, where the Yb triangular lattice is distorted, the TN increases up to 4.5 K. These contrasting responses indicate that the distortion under P//a releases the magnetic frustration and stabilizes the antiferromagnetic order in YbCuGe.

Research Products

• [Journal Article] Metal-semiconductor transition concomitant with a structural transformation in tetrahedrite Cu12Sb4S13 (2016)
  • Author(s): H. I. Tanaka, K. Suekuni, K. Umeo, T. Nagasaki, H. Sato, G. Kutluk, E. Nishibori, H. Kasai, T. Takabatake
  • Journal Title: Journal of Physical Society of Japan Volume: 85 Issue: 1 Pages: 014703-014703
  • DOI: 10.7566/jpsj.85.014703
  • NAID: 210000133804
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Ferromagnetic transition in a caged compound NdOs2Zn20 (2015)
  • Author(s): K. Wakiya, K. T. Matsumoto, T. Onimaru, K. Umeo, T. Takabatake
  • Journal Title: Phys. Procedia Volume: 75 Pages: 511-515
  • DOI: 10.1016/j.phpro.2015.12.064
  • Peer Reviewed / Open Access
• [Journal Article] 高圧力・極低温下における交流法による比熱の絶対値測定 (2015)
  • Author(s): 梅尾 和則
  • Journal Title: 高圧力の科学と技術 Volume: 25 Pages: 283-291
  • NAID: 130005118630
  • Acknowledgement Compliant
• [Journal Article] 希土類化合物の圧力下における磁性-非磁性転移 (2015)
  • Author(s): 梅尾 和則
  • Journal Title: 月刊化学工業 Volume: 66 Pages: 653-661
• [Journal Article] Electronic structure of YbNiX3 (X=Si,Ge) studied by hard x-ray photoemission spectroscopy (2015)
  • Author(s): H. Sato, Y. Utsumi, J. Kodama, H. Nagata, M. A. Avila, R. A. Ribeiro, K. Umeo, T. Takabatake, K. Mimura, S. Motonami, H. Anzai, S. Ueda, K. Shimada, H. Namatame, M. Taniguchi
  • Journal Title: Physica Status Solidi C Volume: 12 Issue: 6 Pages: 620-623
  • DOI: 10.1002/pssc.201400312
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Effect of La substitution in PrIr2Zn20 on the superconductivity and anitiferro-quadrupolar order (2015)
  • Author(s): K. T. Matsumoto, T. Onimaru, K. Wakiya, K. Umeo, T. Takabatake
  • Journal Title: J. Phys. Soc. Jpn. Volume: 84 Issue: 6 Pages: 063703-063703
  • DOI: 10.7566/jpsj.84.063703
  • Peer Reviewed
• [Journal Article] 1.Anomalous Magnetic Phase Diagram of CeTe under High Pressure (2015)
  • Author(s): Hiroaki Takaguchi, Yuya Hayashi, Takeshi Matsumura, Kazunori Umeo, Masafumi Sera, and Akira Ochiai
  • Journal Title: J. Phys. Soc. Jpn., 84 (2015) 044708. Volume: 84 Issue: 4 Pages: 044708-044708
  • DOI: 10.7566/jpsj.84.044708
  • Peer Reviewed / Open Access
• [Journal Article] 1.Suppression of antiferromagnetic order and hybridization gap by electron- and hole-doping in the Kondo semiconductor CeOs2Al10 (2014)
  • Author(s): J. Kawabata, T. Takabatake, K. Umeo, and Y. Muro
  • Journal Title: Physical Review B Volume: 89 Issue: 9
  • DOI: 10.1103/physrevb.89.094404
  • Peer Reviewed
• [Journal Article] 10 GPaまでの圧力下で比熱の絶対値測定が可能な交流法熱量計の開発 (2014)
  • Author(s): 梅尾和則
  • Journal Title: 固体物理 Volume: 49 Pages: 637-644
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Pressure-induced valence change of YbNiGe3 investigated by resonant x-ray emission spectroscopy at the Yb L-3 edge (2014)
  • Author(s): Sato, H, Yamaoka, H, Utsumi, Y, Nagata, H, Avila, MA, Ribeiro, RA, Umeo, K, Takabatake, T, Zekko, Y, Mizuki, J, Lin, JF, Hiraoka, N, Ishii, H, Tsuei, KD, Namatame, H, Taniguchi, M
  • Journal Title: PHYSICAL REVIEW B Volume: 89 Issue: 4 Pages: 45112-45112
  • DOI: 10.1103/physrevb.89.045112
  • Peer Reviewed
• [Presentation] 近藤半導体CeOs2Al10の磁気転移とc-f混成に対する一軸圧力効果 (2016)
  • Author(s): 林慶介, 山田義大, 川端丈, 梅尾和則, 高畠敏郎, 室裕司
  • Organizer: 日本物理学会2016年春季大会
  • Place of Presentation: 東北学院大学 泉キャンパス
  • Year and Date: 2016-03-19
• [Presentation] 7 GPaまでの比熱測定によるI型クラスレートBa8Ga16Sn30のラットリングの体積依存性 (2015)
  • Author(s): 梅尾 和則，末國 晃一郎，高畠 敏郎
  • Organizer: 高圧討論会
  • Place of Presentation: 広島市アステールプラザ
  • Year and Date: 2015-11-10
• [Presentation] I型クラスレートEu8Ga16Ge30の特異な強磁性に対するキャリア密度の効果 (2015)
  • Author(s): 梅尾和則，曽我部聖哉，鬼丸孝博，M. A. Avila，長谷川巧，荻田典男，宇田川眞行，高畠敏郎
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学 千里山キャンパス
  • Year and Date: 2015-09-16
• [Presentation] 三角格子反強磁性体YbCuGeの磁気フラストレーションに対する一軸圧効果 (2015)
  • Author(s): 渡部大地，梅尾和則，荒木幸治，加藤健一，高畠敏郎
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学 千里山キャンパス
  • Year and Date: 2015-09-16
• [Presentation] Improved AC-calorimeter for measuring the absolute value of specific heat up to 10 GPa (2015)
  • Author(s): Kazunori Umeo and Toshiro Takabatake
  • Organizer: AIRAPT2015
  • Place of Presentation: Madrid, Spain
  • Year and Date: 2015-08-30
  • Int'l Joint Research
• [Presentation] 10 GPaまでの高圧力下で比熱の絶対値測定可能な交流法熱量計の開発 (2015)
  • Author(s): 梅尾和則，高畠敏郎
  • Organizer: 日本物理学会第70回年次大会
  • Place of Presentation: 早稲田大学早稲田キャンパス(東京都新宿区）
  • Year and Date: 2015-03-22
• [Presentation] 10 GPaまでの比熱の絶対値測定が可能な交流法熱量計の開発 (2014)
  • Author(s): 梅尾和則，高畠敏郎
  • Organizer: 高圧討論会
  • Place of Presentation: 徳島大学常三島キャンパス(徳島市）
  • Year and Date: 2014-11-22
• [Presentation] PrIr2Zn20の超伝導転移と四極子転移の圧力効果 (2014)
  • Author(s): 梅尾 和則，菅野 雄介，松本 圭介，鬼丸 孝博，高畠 敏郎，松林 和幸，上床 美也
  • Organizer: 日本物理学会2014年秋季大会
  • Place of Presentation: 中部大学春日井キャンパス(愛知県春日井市）
  • Year and Date: 2014-09-09
• [Presentation] Pressure induced heavy-fermion state in a caged superconductor PrIr2Zn20 (2014)
  • Author(s): Kazunori UMEO, Yusuke SUGANO, Keisuke T. MATSUMOTO, Takahiro ONIMARU, Kazuyuki MATSUBAYASHI, Yoshiya UWATOKO and Toshiro TAKABATAKE
  • Organizer: SCES2014
  • Place of Presentation: グルノーブル(フランス）
  • Year and Date: 2014-07-07
• [Presentation] 10 GPaまでの電気抵抗測定によるYbNiGe3の圧力誘起磁気秩序の探索
  • Author(s): 梅尾和則，M. A. Avila，高畠敏郎
  • Organizer: 第54回高圧討論会
  • Place of Presentation: 朱鷺メッセ 新潟コンベンションセンター
• [Presentation] Release of the Magnetic Frustration by Au Substitution in a Quasi-Kagome Antiferromagnet YbAgGe
  • Author(s): K. Umeo, H. Kubo, T. Onimaru, K. Katoh, and T. Takabatake
  • Organizer: The International Conference on Strongly Correlated Electron Systems 2013
  • Place of Presentation: 東京大学 伊藤国際学術研究センター