2013 Fiscal Year Final Research Report
Spin and orbital fluctuations and pairing mechanism in the Fe-based superconductors
| Project/Area Number |
23340097
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Tohoku University (2012-2013)
The University of Tokyo (2011) |
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Principal Investigator |
SATO Taku J 東北大学, 多元物質科学研究所, 教授 (70354214)
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| Co-Investigator(Kenkyū-buntansha) |
NAMBU Yusuke 東北大学, 多元物質科学研究所, 助教 (60579803)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 中性子散乱 / 鉄系超伝導 / X線回折 / 局所構造 / スピン揺らぎ / 軌道揺らぎ |
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| Research Abstract |
Superconductivity in the Fe-based compounds, first reported by Japanese researchers in 2008, have attracted tremendous interests of researchers because of its very high transition temperature up to 56K. Since there exists antiferromagnetically ordered phase adjacent to the superconducting phase, it was argued in the beginning that the superconductivity is due to the spin fluctuations. On the other hand, it was also suggested from the multi-band character of the Fe 3d electrons that orbital degree of freedom may also play an essential role. In this work, we have tried to clarify the role of the orbital degree of freedom in the Fe-based superconductors. We showed that the anisotropic spin correlation observed in the paramagnetic phase can be explained by the random phase approximation, whereas, slight structural distortion was observed by X-ray and neutron diffraction in the paramagnetic phase, which may be related to the orbital degree of freedom. We also worked on the 123 systems.
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[Journal Article] Block magnetism coupled with local distortion in the iron-based spin-ladder, compound BaFe_2Se_32012
Author(s)
Y.Nambu, K.Ohgushi, S.Suzuki, F.Du, M.Avdeev, Y.Uwatoko, K.Munakata, H.Fukazawa, S.Chi, Y.Ueda, T.J.Sato
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Journal Title
Phys. Rev. B
Volume: 85
Pages: 064413(1-5)
DOI
Peer Reviewed
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[Presentation] 梯子型鉄系化合物Ba_(1-x)Cs_xFe_2Se_3に見られる磁性と物性2013
Author(s)
羽合孝文 , 南部雄亮 , 大串研也 , Fei Du, 平田靖透, Maxim Avdeev , 上床美也, 関根由莉奈, 深澤裕, Jie Ma , Songxue Chi ,上田寛, 吉澤英樹 , 佐藤卓
Organizer
日本中性子科学会第13回年会
Place of Presentation
柏市
Year and Date
2013-12-12
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[Presentation] 梯子型鉄系化合物 Ba_<1-x>Cs_xFe_2Se_3における結晶構造と磁性の関係2013
Author(s)
羽合孝文, 南部雄亮, 大串研也, Fei Du,平田靖透, Maxim Avdeev, 上床美也, 関根由莉奈, 深澤裕, Jie Ma, Songxue Chi,上田寛, 吉澤英樹, 佐藤卓
Organizer
日本物理学会 2013年秋季大会
Place of Presentation
徳島大学
Year and Date
2013-09-25
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[Presentation] 梯子型鉄系化合物Ba_(1-x)Cs_xFe_2Se_3の粉末中性子回折による研究2013
Author(s)
羽合孝文, 南部雄亮, 大串研也, Fei Du,平田靖透, Maxim Avdeev, 上床美也, 関根由莉奈, 深澤裕, Jie Ma, Songxue Chi,上田寛, 吉澤英樹, 佐藤卓
Organizer
日本物理学会 第68回年次大会
Place of Presentation
広島大学
Year and Date
2013-03-27
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[Presentation] 梯子型鉄系化合物Ba_(1-x)Cs_xFe_2Se_3の粉末中性子回折による研究2012
Author(s)
羽合孝文, 南部雄亮, 大串研也, Fei Du, Maxim Avdeev, 上床美也, 関根由莉奈,深澤 裕, Jie Ma, Songxue Chi, 上田寛,吉澤英樹, 佐藤 卓
Organizer
日本中性子科学会第12回年会
Place of Presentation
京都大学
Year and Date
2012-12-11
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