Abrupt change in the energy gap of superconducting Ba 1-xK xFe 2As 2 single crystals with hole doping

W. Malaeb; T. Shimojima; Y. Ishida; K. Okazaki; Y. Ota; K. Ohgushi; K. Kihou; T. Saito; C. H. Lee; S. Ishida; M. Nakajima; S. Uchida; H. Fukazawa; Y. Kohori; A. Iyo; H. Eisaki; C. T. Chen; S. Watanabe; H. Ikeda; S. Shin

doi:10.1103/PhysRevB.86.165117

Abrupt change in the energy gap of superconducting Ba _1-xK _xFe ₂As ₂ single crystals with hole doping

W. Malaeb, T. Shimojima, Y. Ishida, K. Okazaki, Y. Ota, K. Ohgushi, K. Kihou, T. Saito, C. H. Lee, S. Ishida, M. Nakajima, S. Uchida, H. Fukazawa, Y. Kohori, A. Iyo, H. Eisaki, C. T. Chen, S. Watanabe, H. Ikeda, S. Shin

SCI - Physics

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Abstract

We performed a laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba _1-xK _xFe ₂As ₂ (BaK) and precisely determined the doping evolution of the superconducting gaps in this compound. The gap size of the outer hole Fermi-surface (FS) sheet around the Brillouin zone (BZ) center shows an abrupt drop with overdoping (for x 0.6) while the inner and middle FS gaps roughly scale with T _c. This is accompanied by the simultaneous disappearance of the electron FS sheet with similar orbital character at the BZ corner. These results indicate the different contributions of X2-Y2 and XZ/YZ orbitals to superconductivity in BaK and can hardly be completely reproduced by the available theories on iron-based superconductors.

Original language	English
Article number	165117
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	86
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.86.165117
Publication status	Published - 2012 Oct 10

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Malaeb, W., Shimojima, T., Ishida, Y., Okazaki, K., Ota, Y., Ohgushi, K., Kihou, K., Saito, T., Lee, C. H., Ishida, S., Nakajima, M., Uchida, S., Fukazawa, H., Kohori, Y., Iyo, A., Eisaki, H., Chen, C. T., Watanabe, S., Ikeda, H., & Shin, S. (2012). Abrupt change in the energy gap of superconducting Ba _1-xK _xFe ₂As ₂ single crystals with hole doping. Physical Review B - Condensed Matter and Materials Physics, 86(16), Article 165117. https://doi.org/10.1103/PhysRevB.86.165117

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title = "Abrupt change in the energy gap of superconducting Ba 1-xK xFe 2As 2 single crystals with hole doping",

abstract = "We performed a laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba 1-xK xFe 2As 2 (BaK) and precisely determined the doping evolution of the superconducting gaps in this compound. The gap size of the outer hole Fermi-surface (FS) sheet around the Brillouin zone (BZ) center shows an abrupt drop with overdoping (for x 0.6) while the inner and middle FS gaps roughly scale with T c. This is accompanied by the simultaneous disappearance of the electron FS sheet with similar orbital character at the BZ corner. These results indicate the different contributions of X2-Y2 and XZ/YZ orbitals to superconductivity in BaK and can hardly be completely reproduced by the available theories on iron-based superconductors.",

author = "W. Malaeb and T. Shimojima and Y. Ishida and K. Okazaki and Y. Ota and K. Ohgushi and K. Kihou and T. Saito and Lee, {C. H.} and S. Ishida and M. Nakajima and S. Uchida and H. Fukazawa and Y. Kohori and A. Iyo and H. Eisaki and Chen, {C. T.} and S. Watanabe and H. Ikeda and S. Shin",

year = "2012",

month = oct,

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doi = "10.1103/PhysRevB.86.165117",

language = "English",

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Malaeb, W, Shimojima, T, Ishida, Y, Okazaki, K, Ota, Y, Ohgushi, K, Kihou, K, Saito, T, Lee, CH, Ishida, S, Nakajima, M, Uchida, S, Fukazawa, H, Kohori, Y, Iyo, A, Eisaki, H, Chen, CT, Watanabe, S, Ikeda, H & Shin, S 2012, 'Abrupt change in the energy gap of superconducting Ba _1-xK _xFe ₂As ₂ single crystals with hole doping', Physical Review B - Condensed Matter and Materials Physics, vol. 86, no. 16, 165117. https://doi.org/10.1103/PhysRevB.86.165117

TY - JOUR

T1 - Abrupt change in the energy gap of superconducting Ba 1-xK xFe 2As 2 single crystals with hole doping

AU - Malaeb, W.

AU - Shimojima, T.

AU - Ishida, Y.

AU - Okazaki, K.

AU - Ota, Y.

AU - Ohgushi, K.

AU - Kihou, K.

AU - Saito, T.

AU - Lee, C. H.

AU - Ishida, S.

AU - Nakajima, M.

AU - Uchida, S.

AU - Fukazawa, H.

AU - Kohori, Y.

AU - Iyo, A.

AU - Eisaki, H.

AU - Chen, C. T.

AU - Watanabe, S.

AU - Ikeda, H.

AU - Shin, S.

PY - 2012/10/10

Y1 - 2012/10/10

N2 - We performed a laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba 1-xK xFe 2As 2 (BaK) and precisely determined the doping evolution of the superconducting gaps in this compound. The gap size of the outer hole Fermi-surface (FS) sheet around the Brillouin zone (BZ) center shows an abrupt drop with overdoping (for x 0.6) while the inner and middle FS gaps roughly scale with T c. This is accompanied by the simultaneous disappearance of the electron FS sheet with similar orbital character at the BZ corner. These results indicate the different contributions of X2-Y2 and XZ/YZ orbitals to superconductivity in BaK and can hardly be completely reproduced by the available theories on iron-based superconductors.

AB - We performed a laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba 1-xK xFe 2As 2 (BaK) and precisely determined the doping evolution of the superconducting gaps in this compound. The gap size of the outer hole Fermi-surface (FS) sheet around the Brillouin zone (BZ) center shows an abrupt drop with overdoping (for x 0.6) while the inner and middle FS gaps roughly scale with T c. This is accompanied by the simultaneous disappearance of the electron FS sheet with similar orbital character at the BZ corner. These results indicate the different contributions of X2-Y2 and XZ/YZ orbitals to superconductivity in BaK and can hardly be completely reproduced by the available theories on iron-based superconductors.

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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 16

M1 - 165117

ER -

Abrupt change in the energy gap of superconducting Ba _1-xK _xFe ₂As ₂ single crystals with hole doping

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