Orbital-independent superconducting gaps in iron pnictides

T. Shimojima; F. Sakaguchi; K. Ishizaka; Y. Ishida; T. Kiss; M. Okawa; T. Togashi; C. T. Chen; S. Watanabe; M. Arita; K. Shimada; H. Namatame; M. Taniguchi; K. Ohgushi; S. Kasahara; T. Terashima; T. Shibauchi; Y. Matsuda; A. Chainani; S. Shin

doi:10.1126/science.1202150

Orbital-independent superconducting gaps in iron pnictides

T. Shimojima, F. Sakaguchi, K. Ishizaka, Y. Ishida, T. Kiss, M. Okawa, T. Togashi, C. T. Chen, S. Watanabe, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, K. Ohgushi, S. Kasahara, T. Terashima, T. Shibauchi, Y. Matsuda, A. Chainani, S. Shin

物理學系

研究成果: Article › 同行評審

129 引文斯高帕斯（Scopus）

摘要

The origin of superconductivity in the iron pnictides has been attributed to antiferromagnetic spin ordering that occurs in close combination with a structural transition, but there are also proposals that link superconductivity to orbital ordering. We used bulk-sensitive laser angle-resolved photoemission spectroscopy on BaFe₂(As_0.65P_0.35)₂ and Ba_0.6K_0.4Fe₂As₂ to elucidate the role of orbital degrees of freedom on the electron-pairing mechanism. In strong contrast to previous studies, an orbital-independent superconducting gap magnitude was found for the hole Fermi surfaces. Our result is not expected from the superconductivity associated with spin fluctuations and nesting, but it could be better explained invoking magnetism-induced interorbital pairing, orbital fluctuations, or a combination of orbital and spin fluctuations. Regardless of the interpretation, our results impose severe constraints on theories of iron pnictides.

原文	English
頁（從 - 到）	564-567
頁數	4
期刊	Science
卷	332
發行號	6029
DOIs	https://doi.org/10.1126/science.1202150
出版狀態	Published - 2011 4月 29

All Science Journal Classification (ASJC) codes

多學科

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10.1126/science.1202150

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Shimojima, T., Sakaguchi, F., Ishizaka, K., Ishida, Y., Kiss, T., Okawa, M., Togashi, T., Chen, C. T., Watanabe, S., Arita, M., Shimada, K., Namatame, H., Taniguchi, M., Ohgushi, K., Kasahara, S., Terashima, T., Shibauchi, T., Matsuda, Y., Chainani, A., & Shin, S. (2011). Orbital-independent superconducting gaps in iron pnictides. Science, 332(6029), 564-567. https://doi.org/10.1126/science.1202150

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title = "Orbital-independent superconducting gaps in iron pnictides",

abstract = "The origin of superconductivity in the iron pnictides has been attributed to antiferromagnetic spin ordering that occurs in close combination with a structural transition, but there are also proposals that link superconductivity to orbital ordering. We used bulk-sensitive laser angle-resolved photoemission spectroscopy on BaFe2(As0.65P0.35)2 and Ba0.6K0.4Fe2As2 to elucidate the role of orbital degrees of freedom on the electron-pairing mechanism. In strong contrast to previous studies, an orbital-independent superconducting gap magnitude was found for the hole Fermi surfaces. Our result is not expected from the superconductivity associated with spin fluctuations and nesting, but it could be better explained invoking magnetism-induced interorbital pairing, orbital fluctuations, or a combination of orbital and spin fluctuations. Regardless of the interpretation, our results impose severe constraints on theories of iron pnictides.",

author = "T. Shimojima and F. Sakaguchi and K. Ishizaka and Y. Ishida and T. Kiss and M. Okawa and T. Togashi and Chen, {C. T.} and S. Watanabe and M. Arita and K. Shimada and H. Namatame and M. Taniguchi and K. Ohgushi and S. Kasahara and T. Terashima and T. Shibauchi and Y. Matsuda and A. Chainani and S. Shin",

year = "2011",

month = apr,

day = "29",

doi = "10.1126/science.1202150",

language = "English",

volume = "332",

pages = "564--567",

journal = "Science",

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Shimojima, T, Sakaguchi, F, Ishizaka, K, Ishida, Y, Kiss, T, Okawa, M, Togashi, T, Chen, CT, Watanabe, S, Arita, M, Shimada, K, Namatame, H, Taniguchi, M, Ohgushi, K, Kasahara, S, Terashima, T, Shibauchi, T, Matsuda, Y, Chainani, A & Shin, S 2011, 'Orbital-independent superconducting gaps in iron pnictides', Science, 卷 332, 編號 6029, 頁 564-567. https://doi.org/10.1126/science.1202150

TY - JOUR

T1 - Orbital-independent superconducting gaps in iron pnictides

AU - Shimojima, T.

AU - Sakaguchi, F.

AU - Ishizaka, K.

AU - Ishida, Y.

AU - Kiss, T.

AU - Okawa, M.

AU - Togashi, T.

AU - Chen, C. T.

AU - Watanabe, S.

AU - Arita, M.

AU - Shimada, K.

AU - Namatame, H.

AU - Taniguchi, M.

AU - Ohgushi, K.

AU - Kasahara, S.

AU - Terashima, T.

AU - Shibauchi, T.

AU - Matsuda, Y.

AU - Chainani, A.

AU - Shin, S.

PY - 2011/4/29

Y1 - 2011/4/29

N2 - The origin of superconductivity in the iron pnictides has been attributed to antiferromagnetic spin ordering that occurs in close combination with a structural transition, but there are also proposals that link superconductivity to orbital ordering. We used bulk-sensitive laser angle-resolved photoemission spectroscopy on BaFe2(As0.65P0.35)2 and Ba0.6K0.4Fe2As2 to elucidate the role of orbital degrees of freedom on the electron-pairing mechanism. In strong contrast to previous studies, an orbital-independent superconducting gap magnitude was found for the hole Fermi surfaces. Our result is not expected from the superconductivity associated with spin fluctuations and nesting, but it could be better explained invoking magnetism-induced interorbital pairing, orbital fluctuations, or a combination of orbital and spin fluctuations. Regardless of the interpretation, our results impose severe constraints on theories of iron pnictides.

AB - The origin of superconductivity in the iron pnictides has been attributed to antiferromagnetic spin ordering that occurs in close combination with a structural transition, but there are also proposals that link superconductivity to orbital ordering. We used bulk-sensitive laser angle-resolved photoemission spectroscopy on BaFe2(As0.65P0.35)2 and Ba0.6K0.4Fe2As2 to elucidate the role of orbital degrees of freedom on the electron-pairing mechanism. In strong contrast to previous studies, an orbital-independent superconducting gap magnitude was found for the hole Fermi surfaces. Our result is not expected from the superconductivity associated with spin fluctuations and nesting, but it could be better explained invoking magnetism-induced interorbital pairing, orbital fluctuations, or a combination of orbital and spin fluctuations. Regardless of the interpretation, our results impose severe constraints on theories of iron pnictides.

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SP - 564

EP - 567

JO - Science

JF - Science

IS - 6029

ER -

Orbital-independent superconducting gaps in iron pnictides

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