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2016 Fiscal Year Annual Research Report

Hybrid f-/p-electron molecular materials

Publicly Offered Research

Project AreaJ-Physics: Physics of conductive multipole systems
Project/Area Number 16H01063
Research InstitutionTohoku University

Principal Investigator

プラシデス コスマス  東北大学, 原子分子材料科学高等研究機構, 教授 (90719006)

Project Period (FY) 2016-04-01 – 2018-03-31
Keywords強相関電子系 / 超伝導 / フラーレン / 希土類元素 / 複合材料・物性
Outline of Annual Research Achievements

The project initiated the creation of a new field of hybrid f-/p-electron molecular materials with novel physical properties. We synthesized new families of molecular f-electron fullerides in which the electronically-active C60 anions were combined with mixed configuration rare earths. Strong correlations dominate the electronic properties of both rare-earth cation and C60 anion sublattices. In particular, the major achievement was the chemical control of the electronic configuration of the Sm ions in Sm-doped fullerides and the tuning of the rare-earth exchange interactions, the Fermi level position (band filling) and the interfullerene separation by the isolation of the Sm-Ca-C60 ternary phases with stoichiometry, Sm(2.75-x)Ca(x)C60. Structural and electronic characterization of the new materials was undertaken both at ambient and elevated pressures.
In further work, we showed that the C60-based alkali metal salts are archetypal examples not only of molecular superconductors with the highest Tc (38 K) among all molecular systems but that they also display the highest Hc2 (>90 T) among all known 3D superconducting solids. At the same time, extension of the molecular components to include polyaromatic hydrocarbons has led to the opening of new research area of strongly correlated molecular solids with exotic properties, namely candidates of quantum spin liquid behavior. Our breakthrough work in this field will appear soon as two consecutive papers in Nature Chemistry.

Current Status of Research Progress
Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

Progress is well ahead of target as new unanticipated directions and new opportunities appeared. Three papers were published in Nature family of Journals.
(1) Work on f-electron fullerides is well on target and new materials and properties are emerging.
(2) We established a remarkable property of fulleride superconductors, namely that their upper critical magnetic field exceeds 90 T and is the record highest among all three-dimensional materials (published in Nature Commun.).
(3) New families of strongly correlated intercalated molecular materials were synthesized for the first time and a new structure acting as candidate host of new quantum spin liquid systems unveiled. The work will appear in two consecutive back-to-back papers in Nature Chemistry.

Strategy for Future Research Activity

Future research plans focus on discovery of new materials and isolation of new electronic ground states.
Emphasis will continue to be placed on the synthesis of new families of strongly correlated f-electron fullerides but we will also tackle more complex materials both synthetically and electronically. These will include:
(1) superconducting ternary metal fullerides. Here we will begin by synthesizing binary alkaline-earth superconductors with closed-shell alkaline-earth metal ions. We will then introduce in the metal sites configurationally active rare-earth cations to synthesize the ternary phases. In this way, we will chemically introduce the prospect of coexisting superconductivity supported by the C60-based electrons and Kondo phenomena associated with the rare earth ions. We will be attempt to probe the stability of the superconducting state with changes in the filling of the fulleride conduction band driven by configuration transitions at the lanthanide dopants, and
(2) binary actinide fullerides. The actinide chemistry of fullerenes is entirely unexplored. Our new exploratory research can lead to access of novel electronic phases with co-existing magnetic and superconducting properties.
The synthetic work will be complemented by structural and electronic characterization of the new materials both at ambient and elevated pressures. This will be achieved by employing X-ray and neutron diffraction structural characterization techniques combined with magnetic characterization using SQUID magnetometry.

  • Research Products

    (25 results)

All 2017 2016 Other

All Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results,  Open Access: 1 results,  Acknowledgement Compliant: 1 results) Presentation (20 results) (of which Int'l Joint Research: 14 results,  Invited: 11 results) Remarks (1 results)

  • [Journal Article] π-electron S = 1/2 quantum-spin-liquid state in an ionic polyaromatic hydrocarbon2017

    • Author(s)
      Y. Takabayashi, M. Menelaou, H. Tamura, N. Takemori, T. Koretsune, A. Stefancic, G. Klupp, A. J. C. Buurma, Y. Nomura, R. Arita, D. Arcon, M. J. Rosseinsky and K. Prassides
    • Journal Title

      Nature Chemistry

      Volume: 9 Pages: 635~643

    • DOI

      10.1038/NCHEM.2764

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Redox-controlled potassium intercalation into two polyaromatic hydrocarbon solids2017

    • Author(s)
      F. D. Romero, M. J. Pitcher, C. I. Hiley, G. F. S. Whitehead, S. Kar, A. Y. Ganin, D. Antypov, C. Collins, M. S. Dyer, G. Klupp, R. H. Colman, K. Prassides and M. J. Rosseinsky
    • Journal Title

      Nature Chemistry

      Volume: 9 Pages: 644~652

    • DOI

      10.1038/NCHEM.2765

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors2017

    • Author(s)
      Y. Kasahara, Y. Takeuchi, R. H. Zadik, Y. Takabayashi, R. H. Colman, R. D. McDonald, M. J. Rosseinsky, K. Prassides, and Y. Iwasa
    • Journal Title

      Nature Communications

      Volume: 8 Pages: 14467

    • DOI

      10.1038/ncomms14467

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Unconventional high-Tc superconductivity in fullerides2016

    • Author(s)
      Y. Takabayashi and K. Prassides
    • Journal Title

      Philosophical Transactions of the Royal Society A

      Volume: 374 Pages: 20150320

    • DOI

      10.1098/rsta.2015.0320

    • Peer Reviewed
  • [Presentation] New quantum spin liquid states purely from carbon π-electrons2017

    • Author(s)
      Prassides Kosmas
    • Organizer
      日本物理学会 第72回年次大会
    • Place of Presentation
      大阪大学
    • Year and Date
      2017-03-17 – 2017-03-20
    • Int'l Joint Research / Invited
  • [Presentation] Pressure response of the mixed valence RE2.75C60 (RE: Sm, Eu) fullerides studied by Raman spectroscopy2017

    • Author(s)
      Arvanitidis Ioannis
    • Organizer
      AIMR International Symposium 2017 (AMIS2017)
    • Place of Presentation
      仙台国際センター
    • Year and Date
      2017-02-13 – 2017-02-17
    • Int'l Joint Research
  • [Presentation] Quantum spin-liquid state in a π-electron carbon system2017

    • Author(s)
      髙林 康裕
    • Organizer
      AIMR International Symposium 2017 (AMIS2017)
    • Place of Presentation
      仙台国際センター
    • Year and Date
      2017-02-13 – 2017-02-17
    • Int'l Joint Research
  • [Presentation] Insulator-to-metal transition in overexpanded RbxCs3-xC60 close to Mott boundary2017

    • Author(s)
      Menelaou Melita
    • Organizer
      AIMR International Symposium 2017 (AMIS2017)
    • Place of Presentation
      仙台国際センター
    • Year and Date
      2017-02-13 – 2017-02-17
    • Int'l Joint Research
  • [Presentation] Orbital mixing and valence transitions in (Sm1-xCax)2.75C60 fullerides2017

    • Author(s)
      中川 剛志
    • Organizer
      AIMR International Symposium 2017 (AMIS2017)
    • Place of Presentation
      仙台国際センター
    • Year and Date
      2017-02-13 – 2017-02-17
    • Int'l Joint Research
  • [Presentation] High-pressure investigations of C60-based molecular superconductors with diamond anvil cells2017

    • Author(s)
      Sobota Robert
    • Organizer
      AIMR International Symposium 2017 (AMIS2017)
    • Place of Presentation
      仙台国際センター
    • Year and Date
      2017-02-13 – 2017-02-17
    • Int'l Joint Research
  • [Presentation] Crystal structure of (Li+@C60-)2: a dimerized endohedral metallofullerene2017

    • Author(s)
      Shen Yongbing
    • Organizer
      AIMR International Symposium 2017 (AMIS2017)
    • Place of Presentation
      仙台国際センター
    • Year and Date
      2017-02-13 – 2017-02-17
    • Int'l Joint Research
  • [Presentation] π-figuration: towards Designer Functional Materials2017

    • Author(s)
      Prassides Kosmas
    • Organizer
      3rd International Symposium on π-System Figuration
    • Place of Presentation
      名古屋大学
    • Year and Date
      2017-01-27 – 2017-01-28
    • Int'l Joint Research / Invited
  • [Presentation] Current status and challenges ahead in p-electron molecular solids2016

    • Author(s)
      Prassides Kosmas
    • Organizer
      大阪府立大学工学域電子物理学工学科講演会
    • Place of Presentation
      大阪府立大学
    • Year and Date
      2016-12-21
    • Invited
  • [Presentation] Current status and challenges ahead in π-electron molecular magnetism and superconductivity - fullerenes and polyaromatic hydrocarbons2016

    • Author(s)
      Prassides Kosmas
    • Organizer
      IMDEA Nanoscience Institute Colloquium
    • Place of Presentation
      Madrid, Spain
    • Year and Date
      2016-12-01
    • Int'l Joint Research / Invited
  • [Presentation] p-electron S=1/2 quantum spin-liquid state an ionic polyaromatic hydrocarbon2016

    • Author(s)
      Prassides Kosmas
    • Organizer
      Phase transition and Dynamical Properties of Spin Transition Materials 2016
    • Place of Presentation
      Valencia, Spain
    • Year and Date
      2016-11-27 – 2016-11-30
    • Int'l Joint Research / Invited
  • [Presentation] A15-structured Cs3C60: the first non-cubic A3C60 fulleride2016

    • Author(s)
      髙林 康裕
    • Organizer
      第51回フラーレン・ナノチューブ・グラフェン総合シンポジウム
    • Place of Presentation
      北海道立道民活動センター
    • Year and Date
      2016-09-08 – 2016-09-10
  • [Presentation] Quantum spin-liquid state in an ionic polyaromatic hydrocarbon2016

    • Author(s)
      髙林 康裕
    • Organizer
      The 15th International Conference on Molecule-based Magnets (ICMM2016)
    • Place of Presentation
      仙台国際センター
    • Year and Date
      2016-09-04 – 2016-09-08
    • Int'l Joint Research
  • [Presentation] Molecular superconductivity: a personal voyage into the unexpected2016

    • Author(s)
      Prassides Kosmas
    • Organizer
      関西学院大学理工学部講演会
    • Place of Presentation
      関西学院大学
    • Year and Date
      2016-09-02
    • Invited
  • [Presentation] Physical and chemical control of superconductivity and magnetism in highly correlated fullerides2016

    • Author(s)
      髙林 康裕
    • Organizer
      17th International Conference on High Pressure in Semiconductor Physics (HPSP17) & The Workshop on High Pressure Study on Superconducting (WHS)
    • Place of Presentation
      東京大学
    • Year and Date
      2016-08-07 – 2016-08-11
    • Int'l Joint Research
  • [Presentation] Optimized Unconventional High-Tc Superconductivity in Fullerides2016

    • Author(s)
      Prassides Kosmas
    • Organizer
      International Conference on Quantum in Complex Matter: Superconductivity, Magnetism and Ferroelectricity, Superstripes 2016
    • Place of Presentation
      Ischia, Italy
    • Year and Date
      2016-06-23 – 2016-06-28
    • Int'l Joint Research / Invited
  • [Presentation] The fascinating tale of metals and molecules in the molecular scale and nanoscale2016

    • Author(s)
      Menelaou Melita
    • Organizer
      東北大学理学部講演会
    • Place of Presentation
      東北大学
    • Year and Date
      2016-05-31
    • Invited
  • [Presentation] Towards hybrid f-/p-electron molecular materials2016

    • Author(s)
      Prassides Kosmas
    • Organizer
      J-Physics Annual Meeting 2016
    • Place of Presentation
      北海道大学
    • Year and Date
      2016-05-26 – 2016-05-28
    • Invited
  • [Presentation] Current Status and Challenges ahead in Fullerene Superconductivity2016

    • Author(s)
      Prassides Kosmas
    • Organizer
      International Workshop on Fundamental and Applied Research of Novel Nanocarbon Derivatives; Toward Bottom Up Approach to Nanocarbon Era
    • Place of Presentation
      東北大学
    • Year and Date
      2016-05-17
    • Int'l Joint Research / Invited
  • [Presentation] Quantum magnets, spin liquids, metals and superconductors. And all without any metal ions2016

    • Author(s)
      Prassides Kosmas
    • Organizer
      東北大学理学部講演会
    • Place of Presentation
      東北大学
    • Year and Date
      2016-04-12
    • Invited
  • [Remarks] Functional Molecular Materials Laboratory

    • URL

      http://www.wpi-aimr.tohoku.ac.jp/prassides_labo/

URL: 

Published: 2018-01-16  

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