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Study of spin-lattice dynamics and transports in frustrated spinel oxides

Research Project

Project/Area Number 26800174
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Condensed matter physics II
Research InstitutionTohoku University

Principal Investigator

Tomiyasu Keisuke  東北大学, 理学(系)研究科(研究院), 助教 (20350481)

Project Period (FY) 2014-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywordsスピン分子 / フラストレーション / スピン格子結合 / スピン揺らぎ
Outline of Final Research Achievements

We carried on with the combination work of neutron scattering and ultrasound measurements on the frustrated spinel oxides with no magnetic order. In ZnFe2O4 without orbital degree of freedom, we observed a molecular spin excitation level at 10 meV (~ 100 K in energy). Elastic constant softens below 100 K, in which the thermal population of this level decreases. In MgV2O4 with orbital degree of freedom, the spin-orbital order vanishes by slightly excess Mg and molecular spin excitations were found. However, the energy structure is described as not a discrete level but a broad distribution from near zero to over 30 meV (~ 300 K in energy). The softening of elastic constant was confirmed below 150 K at least, which will be extended up to 300 K in principle in consideration of the spin excitation energy. Our studies experimentally show that the molecular spin excitations are accompanied with spin-lattice coupling and become source of anomalous phonon properties.

Report

(3 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • Research Products

    (13 results)

All 2016 2015 2014 Other

All Int'l Joint Research (2 results) Journal Article (6 results) (of which Peer Reviewed: 6 results,  Acknowledgement Compliant: 4 results) Presentation (4 results) Remarks (1 results)

  • [Int'l Joint Research] NSRRC(台湾)

    • Related Report
      2015 Annual Research Report
  • [Int'l Joint Research] ORNL(米国)

    • Related Report
      2015 Annual Research Report
  • [Journal Article] Observation of all-in type tetrahedral displacements in nonmagnetic pyrochlore niobates2016

    • Author(s)
      S. Torigoe, Y. Ishimoto, Y. Aoishi, H. Murakawa, D. Matsumura, K. Yoshii, Y. Yoneda, Y. Nishihata, K. Kodama, K. Tomiyasu, K. Ikeda, H. Nakao, Y. Nogami, N. Ikeda, T. Otomo, and N. Hanasaki
    • Journal Title

      Phys. Rev. B

      Volume: 93 Issue: 8 Pages: 085109-085109

    • DOI

      10.1103/physrevb.93.085109

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Development of Spin Correlations in the Geometrically Frustrated Triangular-Lattice Heisenberg Antiferromagnet CuCrO22015

    • Author(s)
      Ryoichi Kajimoto, Keisuke Tomiyasu, Kenji Nakajima, Seiko Ohira-Kawamura, Yasuhiro Inamura, and Tetsuji Okuda
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 7884 Issue: 7 Pages: 074708-074708

    • DOI

      10.7566/jpsj.84.074708

    • NAID

      210000133629

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Acoustic study of dynamical molecular-spin state without magnetic phase transition in spin-frustrated ZnFe2O42015

    • Author(s)
      Tadataka Watanabe, Shota Takita, Keisuke Tomiyasu, and Kazuya Kamazawa
    • Journal Title

      Physical Review B

      Volume: 92 Issue: 17 Pages: 174420-174420

    • DOI

      10.1103/physrevb.92.174420

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Estimation of Bonding Nature Using Diamagnetic Susceptibility2015

    • Author(s)
      K. Tomiyasu, T. Sato, and S. Orimo
    • Journal Title

      Chemical Communications

      Volume: in press Issue: 41 Pages: 8691-8694

    • DOI

      10.1039/c5cc02351c

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] フラストレート磁性体のスピンダイナミックス -スピネル酸化物にひそむスピンの分子たち-2015

    • Author(s)
      富安啓輔
    • Journal Title

      Radioisotopes

      Volume: in press

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Spin-Orbit Fluctuations in Frustrated Heavy-Fermion Metal LiV2O42014

    • Author(s)
      K. Tomiyasu, K. Iwasa, H. Ueda, S. Niitaka, H. Takagi, S. Ohira-Kawamura, T. Kikuchi, Y. Inamura, K. Nakajima, and K. Yamada
    • Journal Title

      Phys. Rev. Lett.

      Volume: 113 Issue: 23 Pages: 236402-236402

    • DOI

      10.1103/physrevlett.113.236402

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Presentation] Te6+置換による電子ドープLaCoO3系におけるスピン状態ブロッケード2015

    • Author(s)
      富安啓輔,小山俊一,綿引正倫,佐藤美嘉,西原和貴,小野寺貢,岩佐和晃,野島勉,山崎裕一,中尾裕則,村上洋一
    • Organizer
      日本物理学会第70回年次大会
    • Place of Presentation
      早稲田大(東京)
    • Year and Date
      2015-03-21 – 2015-03-24
    • Related Report
      2014 Research-status Report
  • [Presentation] Spin-state blockade in Te6+-substituted electron-doped LaCoO32015

    • Author(s)
      K. Tomiyasu, S. Koyama, M. Watahiki, M. Sato, K. Nishihara, M. Onodera, K. Iwasa, T. Nojima, Y. Yamasaki, H. Nakao, and Y. Murakami
    • Organizer
      APS March Meeting
    • Place of Presentation
      Henry B. Gonzalez Convention Center (San Antonio, USA)
    • Year and Date
      2015-03-01 – 2015-03-05
    • Related Report
      2014 Research-status Report
  • [Presentation] スピンフラストレート系スピネルZnFe2O4の弾性異常2014

    • Author(s)
      滝田将太,富安啓輔,蒲沢和也,渡辺忠孝
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      中部大(春日井市)
    • Year and Date
      2014-09-18 – 2014-09-21
    • Related Report
      2014 Research-status Report
  • [Presentation] 重い電子を示すフラストレーション系LiV2O4におけるスピン揺らぎ2014

    • Author(s)
      富安啓輔,岩佐和晃,植田浩明,新高誠司,高木英典,河村聖子,菊池龍弥,稲村泰弘、中島健次,山田和芳
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      中部大(春日井市)
    • Year and Date
      2014-09-18 – 2014-09-21
    • Related Report
      2014 Research-status Report
  • [Remarks] 東北大学大学院理学研究科物理学専攻

    • URL

      http://www.phys.tohoku.ac.jp/research-fields/cme1/materials_structure/

    • Related Report
      2015 Annual Research Report

URL: 

Published: 2014-04-04   Modified: 2022-02-16  

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