2011 Fiscal Year Final Research Report
Study of exotic superconductivity in the iron-family-based intermetallic compounds
| Project/Area Number |
21740266
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | Nihon University |
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Principal Investigator |
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| Project Period (FY) |
2009 – 2011
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| Keywords | エキゾチック超伝導 / マルチギャップ超伝導 / 不純物効果 / 熱伝導率 / プラストレーション / 超音波測定 / 中性子散乱 / スピン分子 / 軌道整列 |
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| Research Abstract |
This project performed studies of exotic superconductivity and geometrical frustration effects in several iron-family-based compounds. And remarkable research results were obtained especially in the study of exotic superconductivity in the iron silicide Lu_2Fe_3Si_5, and the study of geometrical frustration effects in The spinel cobaltite GeCo_2O_4.
The iron silicide superconductor Lu_2Fe_3Si_5 has three-dimensional multiband structure which is demarcated from the multiband structure in the iron arsenide superconductors. This project performed study of non-magnetic impurity effects on the superconductivity, and magneto-thermal transport experiments in Lu_2Fe_3Si_5. And we obtained research results which strongly suggest the sign-reversed multigap superconductivity.
The spinel cobaltite GeCo_2O_4 is a geometrically-frustrated magnet with orbital degrees of freedom, where an antiferromagnetic transition occurs despite the dominance of ferromagnetic exchange interactions. Inelastic neutron scattering experimets in GeCo_2O_4 observed a typical frustration effect of molecular spin excitations. Furthermore, ultrasound velocity measuremets in GeCo_2O_4 observed elastic anomalies driven by the molecular spin excitations, and elastic anomalies which strongly suggest the occurrence of magnetic-field induced orbital order-order transitions.
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Research Products
(48 results)
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[Journal Article] Molecular spin-orbit excitations in the Jeff=1/2 frustrated spinel GeCo_2O_42011
Author(s)
K. Tomiyasu, M. K. Crawford, D. T. Adroja, P. Manuel, A. Tominaga, S. Hara, H. Sateo, T. Watanabe, S. I. Ikeda, J. W. Lynn, K. Iwasa, and K. Yamada
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Journal Title
Phys. Rev. B
Volume: 84
Pages: 054405-1-7
Peer Reviewed
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[Presentation] GeCo_2O_4の磁化率の圧力効果2012
Author(s)
原茂生, 松田崇弘, 大久保晋, 梅山規男, 大島祐之, 高橋美和子, 渡辺忠孝, 富安啓輔, 池田伸一
Organizer
特定領域研究「フラストレーションが創る新しい物性」最終成果報告会
Place of Presentation
大阪大学
Year and Date
2012-01-07
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[Presentation] Effects of substitution in YCoC2010
Author(s)
T. Watanabe, K. Sate, K. Takase, Y. Takano
Organizer
17th International Conference on Solid Compounds of Transition Elements(SCTE2010)
Place of Presentation
Annecy(France)
Year and Date
2010-09-06
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[Presentation] 幾何学的フラストレート系におけるスピン励起と格子振動の中性子非弾性散乱研究2010
Author(s)
富安啓輔, Mike K. Crawford, D. T. Adroja, Pascal Manuel, 富永あやか, 原茂生, 渡辺忠孝, 池田伸一, 横堀利夫, 高阪勇輔, 秋光純, 岩佐和晃, 山田和芳
Organizer
特定領域研究「フラストレーションが創る新しい物性」平成22年度立ち上げ全体会議
Place of Presentation
理化学研究所
Year and Date
2010-05-11
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