2007 Fiscal Year Final Research Report Summary
Research of Competition and Coexistence of Charge-ordered and Superconducting States in Novel Organic Superconductors
| Project/Area Number |
17540315
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MORI Hatsumi The University of Tokyo, Institute for Solid State Physics,, Associate Professor (00334342)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Kazuyuki The University of Tokyo, Institute for Solid State Physics, Research Associate (60342953)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Stronely correlated system / Organic conductor / Superconducting materials and device / Molecular solid / Magnetism |
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| Research Abstract |
In order to investigate the relationship between charge ordering and superconductivity for novel organic superconductor beta-(meso-DMBEDT-TTF)_2PF_6, the detailed measurements of electrical resistivity and magnetoresistivity have been carried out.
Our results are followings.
(1) Determination of superconducting state by measurements of electrical and magnetoresistivity under pressureThe detailed measurements of electrical resistivity under pressure revealed that the resistance drop of observed at Tc(onset) = 4.6 K under relatively low pressure 0.6 kbar, whose superconductivity was confirmed by applying magnetic field. The superconducting phase extends widely to Tc=2.6K under 5.2 kbar.
(2) Determination of charge-ordered state by temperature and magnetic field dependences of magnetoresistance under pressure The temperature dependence of resistivity for beta-(meso-DMBEDT-TTF)_2PF_6 is peculiar under 0.6 kbar; the resistivity minimum is observed at 60K, the increase of resistivity by 8 times with lowering temperature, and the sudden drop of resitivity is observed at 4.6K. The raman spectroscopy under pressure demonstrates that the resistivity increase is originated by charge ordering (CO). In this CO region, large magnetoresistance was observed, its increasing rate (ΔR/R(0T)) increases with applying pressure, and in even the metallic state at low temperatures, the magnetoresistance can be observed. Therefore, the illustrated P-T phase diagram reveals that the static and dyanimical CO states exist in neighbouring of superconducting state, which is the first experimental observation among molecular superconductors.
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Research Products
(149 results)
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[Journal Article] Metallic Transprot and Ferrimagnetic Interaction Achieved by Band Filling Control in Organic Conductors; β'-ET_3(MCl_4^<2->)_<2-x>(M'Cl_4^<1->)_x [M=Co, Zn, M'=Ga, Fe]2005
Author(s)
M. Suto, K. Yamashita, H. Suzuki, K. Yoshimi, S. Kimura, H. Mori, T. Kawamoto, T. Mori, Y. Nishio, and K. Kajita
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Journal Title
J. Phys. Soc. Jpn. 74
Pages: 2061-2068
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Biferrocene-M(mnt)_2 Charge-Transfer Complexes(M=Ni, Co; mnt=Maleonitriledithiolate). Structure, Valence States, and Magnetic Properties2005
Author(s)
T. Mochida, K. Takazawa, H. Matsui M. Takahashi, M. Takeda, M. Sato, Y. Nishio, K. Kajita, and H. Mori
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Journal Title
Inorg. Chem. 44
Pages: 8628-8641
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Organic thyristor2005
Author(s)
F. Sawano, I. Terasaki, H. Mori, T. Mori, M. Watanabe, N. Ikeda, Y. Nogami, and Y. Noda
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Journal Title
Nature 437
Pages: 522-524
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Metallic Transport and Ferrimagnetic Interaction Achieved by Band Filling Control in Organic Conductors ; β'-ET_3(MCl_4^<2->)_2-x(MCl_4^<1->)_x[M=Co,Zn,M=Ga,Fe]2005
Author(s)
M. Suto, K. Yamashita, H. Suzuki, K. Yoshimi, S. Kimura, H. Mori, T. Kawamoto, T. Mori, Y. Nishio, and K. Kajita
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Journal Title
J. Phys. Soc. Jpn 74
Pages: 2061-2068
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Biferrocene-M(mnt)_2 Charge-Transfer Complexes(M=Ni, Co ; mnt=Maleonitriledithiolate). Structure, Valence States, and Magnetic Properties2005
Author(s)
T. Mochida, K. Takazawa, H. Matsui M. Takahashi, M. Takeda, M. Sato, Y Nishio, K. Kajita, and H. Mori
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Journal Title
Inorg. Chem 44
Pages: 8628-8641
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Nitrogen-Introduced Organic Conductors, CnDTP-TTF, C2TP-TTP, and Related Materials2005
Author(s)
Shinya Kimura, Shun Ichikawa, Kazuki Yamashita, Ryoma Chiba, Hatsumi Mori, Takehiko Mori, Yutaka Nishio, Kohji Kajita
Organizer
Sixth International Symposium on Crystalline Organic Metals, Superconductors, and Ferromagnets (ISMC2005)
Place of Presentation
Key West(U.S.A.)
Year and Date
2005-09-14
Description
「研究成果報告書概要(和文)」より
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[Presentation] Pressure-induced superconductivity of β-(meso-DMBEDT-TTF)_2PF_6 and related materials2005
Author(s)
Hatsumi Mori, Tomoko Maejima, Ryoma Chiba, Hideaki Suzuki, Shinya Kimura, Junichi Yamaura, Tadashi Kawamoto, Takehiko Mori, Toru Kakiuchi, Hiroshi Sawa, Hiroshi Moriyama, Yutaka Nishio, and Koji Kajita
Organizer
Sixth International Symposium on Crystalline Organic Metals, Superconductors, and Ferromagnets (ISMC2005)
Place of Presentation
Key West(U.S.A.)
Year and Date
2005-09-14
Description
「研究成果報告書概要(和文)」より
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[Presentation] Magnetic property for ET derivative salt under negative chemical pressure, β'-(C5ET)_2PF_62005
Author(s)
K. Yoshimi, K.Kohno, R.Chiba, T. Maejima, H. Suzuki, S. Kimura, T.Kato, H. Tajima, Y. Nishio, K. Kajita, H. Moriyama, and H. Mori
Organizer
International Symposium on Molecular Conductors-Novel functions of molecular conductors under extreme conditions-(ISMC2005)
Place of Presentation
湘南国際村
Year and Date
2005-07-17
Description
「研究成果報告書概要(和文)」より
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[Presentation] Synthesis, crystal structure, and magnetic property of copper complex containing bis-pyrazino tetrathiafulvalene as ligand, 「CuCl_2(BP-TTF)」2005
Author(s)
Shun Ichikawa, Shinya Kimura, Hiroyuki Tajima, and Hatsumi Mori T.Kato, H. Tajima, Y. Nishio, K. Kajita, H. Moriyama, and H. Mori
Organizer
International Symposium on Molecular Conductors-Novel functions of molecular conductors under extreme conditions-(ISMC2005)
Place of Presentation
湘南国際村
Year and Date
2005-07-17
Description
「研究成果報告書概要(和文)」より
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[Presentation] Pyrazino-fused Organic Conductors, CnDTP-TTF and C2TP-TS-TTP2005
Author(s)
Shinya Kimura, Shun Ichikawa, Kazuki Yamashita, Ryoma Chiba, Hatsumi Mori, Takehiko Mori, Yutaka Nishio, and Koji Kajita
Organizer
International Symposium on Molecular Conductors-Novel functions of molecular conductors under extreme conditions-(ISMC2005)
Place of Presentation
湘南国際村
Year and Date
2005-07-17
Description
「研究成果報告書概要(和文)」より
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[Presentation] Competition of charge ordering and superconducting states for the organic superconductor2005
Author(s)
Hatsumi Mori, Tomoko Maejima, Ryoma Chiba, Hideaki Suzuki, Shinya Kimura, Junichi Yamaura, Tadashi Kawamoto, Takehiko Mori, Toru Kakiuchi, Hiroshi Sawa, Hiroshi Moriyama, Yuyaka Nishio, and Koji Kajita
Organizer
International Symposium on Molecular Conductors-Novel functions of molecular conductors under extreme conditions-(ISMC2005)
Place of Presentation
湘南国際村
Year and Date
2005-07-17
Description
「研究成果報告書概要(和文)」より
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