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

Department of Physics

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

129 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

All Science Journal Classification (ASJC) codes

General

Access to Document

10.1126/science.1202150

Cite this

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

@article{6220b63d6bd3429ab9ba632f18fefd26,

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",

issn = "0036-8075",

publisher = "American Association for the Advancement of Science",

number = "6029",

}

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

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.

UR - http://www.scopus.com/inward/record.url?scp=79955537314&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79955537314&partnerID=8YFLogxK

U2 - 10.1126/science.1202150

DO - 10.1126/science.1202150

M3 - Article

C2 - 21474714

AN - SCOPUS:79955537314

SN - 0036-8075

VL - 332

SP - 564

EP - 567

JO - Science

JF - Science

IS - 6029

ER -

Orbital-independent superconducting gaps in iron pnictides

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this