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Octet-Line Node Structure of Superconducting Order Parameter in KFe2As2.

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Title: Octet-Line Node Structure of Superconducting Order Parameter in KFe2As2.
Authors: Okazaki, K., Ota, Y., Kotani, Y., Malaeb, W., Ishida, Y., Shimojima, T., Kiss, T., Watanabe, S., Chen, C.-T., Kihou, K., Lee, C. H., Iyo, A., Eisaki, H., Saito, T., Fukazawa, H., Kohori, Y., Hashimoto, K., Shibauchi, T., Matsuda, Y., Ikeda, H.
Source: Science (pre-March 2025). 9/14/2012, Vol. 337 Issue 6100, p1314-1317. 4p.
Subjects: Iron-based superconductors, Fermi surfaces, Photoelectron spectroscopy, Band gaps, Symmetry, Superconductivity, Shear waves
Abstract: In iron-pnictide superconductivity, the interband interaction between the hole and electron Fermi surfaces (FSs) is believed to play an important role. However, KFe2As2 has three zone-centered hole FSs and no electron FS but still exhibits superconductivity. Our ultrahigh-resolution laser angle-resolved photoemission spectroscopy unveils that KFe2As2 is a nodal s-wave superconductor with highly unusual FS-selective multi-gap structure: a nodeless gap on the inner FS, an unconventional gap with "octet-line nodes" on the middle FS, and an almost-zero gap on the outer FS. This gap structure may arise from the frustration between competing pairing interactions on the hole FSs causing the eightfold sign reversal. Our results suggest that the A1g superconducting symmetry is universal in iron-pnictides, in spite of the variety of gap functions. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Octet-Line Node Structure of Superconducting Order Parameter in KFe<subscript>2</subscript>As<subscript>2</subscript>.
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  Data: <searchLink fieldCode="AR" term="%22Okazaki%2C+K%2E%22">Okazaki, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Ota%2C+Y%2E%22">Ota, Y.</searchLink><br /><searchLink fieldCode="AR" term="%22Kotani%2C+Y%2E%22">Kotani, Y.</searchLink><br /><searchLink fieldCode="AR" term="%22Malaeb%2C+W%2E%22">Malaeb, W.</searchLink><br /><searchLink fieldCode="AR" term="%22Ishida%2C+Y%2E%22">Ishida, Y.</searchLink><br /><searchLink fieldCode="AR" term="%22Shimojima%2C+T%2E%22">Shimojima, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Kiss%2C+T%2E%22">Kiss, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Watanabe%2C+S%2E%22">Watanabe, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Chen%2C+C%2E-T%2E%22">Chen, C.-T.</searchLink><br /><searchLink fieldCode="AR" term="%22Kihou%2C+K%2E%22">Kihou, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Lee%2C+C%2E+H%2E%22">Lee, C. H.</searchLink><br /><searchLink fieldCode="AR" term="%22Iyo%2C+A%2E%22">Iyo, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Eisaki%2C+H%2E%22">Eisaki, H.</searchLink><br /><searchLink fieldCode="AR" term="%22Saito%2C+T%2E%22">Saito, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Fukazawa%2C+H%2E%22">Fukazawa, H.</searchLink><br /><searchLink fieldCode="AR" term="%22Kohori%2C+Y%2E%22">Kohori, Y.</searchLink><br /><searchLink fieldCode="AR" term="%22Hashimoto%2C+K%2E%22">Hashimoto, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Shibauchi%2C+T%2E%22">Shibauchi, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Matsuda%2C+Y%2E%22">Matsuda, Y.</searchLink><br /><searchLink fieldCode="AR" term="%22Ikeda%2C+H%2E%22">Ikeda, H.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 9/14/2012, Vol. 337 Issue 6100, p1314-1317. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Iron-based+superconductors%22">Iron-based superconductors</searchLink><br /><searchLink fieldCode="DE" term="%22Fermi+surfaces%22">Fermi surfaces</searchLink><br /><searchLink fieldCode="DE" term="%22Photoelectron+spectroscopy%22">Photoelectron spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Band+gaps%22">Band gaps</searchLink><br /><searchLink fieldCode="DE" term="%22Symmetry%22">Symmetry</searchLink><br /><searchLink fieldCode="DE" term="%22Superconductivity%22">Superconductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Shear+waves%22">Shear waves</searchLink>
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  Data: In iron-pnictide superconductivity, the interband interaction between the hole and electron Fermi surfaces (FSs) is believed to play an important role. However, KFe2As2 has three zone-centered hole FSs and no electron FS but still exhibits superconductivity. Our ultrahigh-resolution laser angle-resolved photoemission spectroscopy unveils that KFe2As2 is a nodal s-wave superconductor with highly unusual FS-selective multi-gap structure: a nodeless gap on the inner FS, an unconventional gap with "octet-line nodes" on the middle FS, and an almost-zero gap on the outer FS. This gap structure may arise from the frustration between competing pairing interactions on the hole FSs causing the eightfold sign reversal. Our results suggest that the A1g superconducting symmetry is universal in iron-pnictides, in spite of the variety of gap functions. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=pbh&AN=80171414
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