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

Research output: Contribution to journal › Article › peer-review

116 Citations (Scopus)

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(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.

Original language	English
Pages (from-to)	564-567
Number of pages	4
Journal	Science
Volume	332
Issue number	6029
DOIs	https://doi.org/10.1126/science.1202150
Publication status	Published - 2011 Apr 29
Externally published	Yes

ASJC Scopus subject areas

General

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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

Orbital-independent superconducting gaps in iron pnictides. / 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.

In: Science, Vol. 332, No. 6029, 29.04.2011, p. 564-567.

Research output: Contribution to journal › Article › peer-review

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

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. / Orbital-independent superconducting gaps in iron pnictides. In: Science. 2011 ; Vol. 332, No. 6029. pp. 564-567.

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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.",

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AU - Okawa, M.

AU - Togashi, T.

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AU - Watanabe, S.

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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.

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