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

研究成果 › 査読

77 被引用数 (Scopus)

抄録

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.

本文言語	English
ページ（範囲）	564-567
ページ数	4
ジャーナル	Science
巻	332
号	6029
DOI	https://doi.org/10.1126/science.1202150
出版ステータス	Published - 4月 29 2011
外部発表	はい

ASJC Scopus subject areas

一般

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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

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, vol. 332, no. 6029, pp. 564-567. https://doi.org/10.1126/science.1202150

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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",

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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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Orbital-independent superconducting gaps in iron pnictides

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