Universality of superconducting gaps in overdoped Ba0.3K 0.7Fe2As2 observed by angle-resolved photoemission spectroscopy

K. Nakayama; T. Sato; P. Richard; Y. M. Xu; T. Kawahara; K. Umezawa; T. Qian; M. Neupane; G. F. Chen; H. Ding; T. Takahashi

doi:10.1103/PhysRevB.83.020501

Universality of superconducting gaps in overdoped Ba_0.3K _0.7Fe₂As₂ observed by angle-resolved photoemission spectroscopy

K. Nakayama, T. Sato, P. Richard, Y. M. Xu, T. Kawahara, K. Umezawa, T. Qian, M. Neupane, G. F. Chen, H. Ding, T. Takahashi

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

89 Citations (Scopus)

Abstract

We have performed angle-resolved photoemission spectroscopy on the overdoped Ba_0.3K_0.7Fe₂As₂ superconductor (T_c=22 K). We demonstrate that the superconducting (SC) gap on each Fermi surface (FS) is nearly isotropic whereas the gap value varies from 4.4 to 7.9 meV on different FSs. By comparing with under- and optimally doped Ba_1-xK_xFe₂As₂, we find that the gap value on each FS nearly scales with T_c over a wide doping range (0.25≤x≤0.7). Although the FS volume and the SC gap magnitude are strongly doping dependent, the multiple nodeless gaps can be commonly fitted by a single gap function assuming pairing up to the second nearest neighbor, suggesting the universality of the short-range pairing states with the s_±-wave symmetry.

Original language	English
Article number	020501
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	83
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.83.020501
Publication status	Published - 2011 Jan 10

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1103/PhysRevB.83.020501

Fingerprint Dive into the research topics of 'Universality of superconducting gaps in overdoped Ba0.3K 0.7Fe2As2 observed by angle-resolved photoemission spectroscopy'. Together they form a unique fingerprint.

Cite this

Nakayama, K., Sato, T., Richard, P., Xu, Y. M., Kawahara, T., Umezawa, K., Qian, T., Neupane, M., Chen, G. F., Ding, H., & Takahashi, T. (2011). Universality of superconducting gaps in overdoped Ba_0.3K _0.7Fe₂As₂ observed by angle-resolved photoemission spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 83(2), [020501]. https://doi.org/10.1103/PhysRevB.83.020501

Universality of superconducting gaps in overdoped Ba_0.3K _0.7Fe₂As₂ observed by angle-resolved photoemission spectroscopy. / Nakayama, K.; Sato, T.; Richard, P.; Xu, Y. M.; Kawahara, T.; Umezawa, K.; Qian, T.; Neupane, M.; Chen, G. F.; Ding, H.; Takahashi, T.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 83, No. 2, 020501, 10.01.2011.

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

Nakayama, K , Sato, T, Richard, P, Xu, YM, Kawahara, T, Umezawa, K, Qian, T, Neupane, M, Chen, GF, Ding, H & Takahashi, T 2011, 'Universality of superconducting gaps in overdoped Ba_0.3K _0.7Fe₂As₂ observed by angle-resolved photoemission spectroscopy', Physical Review B - Condensed Matter and Materials Physics, vol. 83, no. 2, 020501. https://doi.org/10.1103/PhysRevB.83.020501

@article{745f77f3bf854c85943589e8a6709ad4,

title = "Universality of superconducting gaps in overdoped Ba0.3K 0.7Fe2As2 observed by angle-resolved photoemission spectroscopy",

abstract = "We have performed angle-resolved photoemission spectroscopy on the overdoped Ba0.3K0.7Fe2As2 superconductor (Tc=22 K). We demonstrate that the superconducting (SC) gap on each Fermi surface (FS) is nearly isotropic whereas the gap value varies from 4.4 to 7.9 meV on different FSs. By comparing with under- and optimally doped Ba1-xKxFe2As2, we find that the gap value on each FS nearly scales with Tc over a wide doping range (0.25≤x≤0.7). Although the FS volume and the SC gap magnitude are strongly doping dependent, the multiple nodeless gaps can be commonly fitted by a single gap function assuming pairing up to the second nearest neighbor, suggesting the universality of the short-range pairing states with the s±-wave symmetry.",

author = "K. Nakayama and T. Sato and P. Richard and Xu, {Y. M.} and T. Kawahara and K. Umezawa and T. Qian and M. Neupane and Chen, {G. F.} and H. Ding and T. Takahashi",

year = "2011",

month = jan,

day = "10",

doi = "10.1103/PhysRevB.83.020501",

language = "English",

volume = "83",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "0163-1829",

publisher = "American Institute of Physics Publising LLC",

number = "2",

}

TY - JOUR

T1 - Universality of superconducting gaps in overdoped Ba0.3K 0.7Fe2As2 observed by angle-resolved photoemission spectroscopy

AU - Nakayama, K.

AU - Sato, T.

AU - Richard, P.

AU - Xu, Y. M.

AU - Kawahara, T.

AU - Umezawa, K.

AU - Qian, T.

AU - Neupane, M.

AU - Chen, G. F.

AU - Ding, H.

AU - Takahashi, T.

PY - 2011/1/10

Y1 - 2011/1/10

N2 - We have performed angle-resolved photoemission spectroscopy on the overdoped Ba0.3K0.7Fe2As2 superconductor (Tc=22 K). We demonstrate that the superconducting (SC) gap on each Fermi surface (FS) is nearly isotropic whereas the gap value varies from 4.4 to 7.9 meV on different FSs. By comparing with under- and optimally doped Ba1-xKxFe2As2, we find that the gap value on each FS nearly scales with Tc over a wide doping range (0.25≤x≤0.7). Although the FS volume and the SC gap magnitude are strongly doping dependent, the multiple nodeless gaps can be commonly fitted by a single gap function assuming pairing up to the second nearest neighbor, suggesting the universality of the short-range pairing states with the s±-wave symmetry.

AB - We have performed angle-resolved photoemission spectroscopy on the overdoped Ba0.3K0.7Fe2As2 superconductor (Tc=22 K). We demonstrate that the superconducting (SC) gap on each Fermi surface (FS) is nearly isotropic whereas the gap value varies from 4.4 to 7.9 meV on different FSs. By comparing with under- and optimally doped Ba1-xKxFe2As2, we find that the gap value on each FS nearly scales with Tc over a wide doping range (0.25≤x≤0.7). Although the FS volume and the SC gap magnitude are strongly doping dependent, the multiple nodeless gaps can be commonly fitted by a single gap function assuming pairing up to the second nearest neighbor, suggesting the universality of the short-range pairing states with the s±-wave symmetry.

UR - http://www.scopus.com/inward/record.url?scp=79551623041&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79551623041&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.83.020501

DO - 10.1103/PhysRevB.83.020501

M3 - Article

AN - SCOPUS:79551623041

VL - 83

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

SN - 0163-1829

IS - 2

M1 - 020501

ER -

Universality of superconducting gaps in overdoped Ba_0.3K _0.7Fe₂As₂ observed by angle-resolved photoemission spectroscopy

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint Dive into the research topics of 'Universality of superconducting gaps in overdoped Ba<sub>0.3</sub>K <sub>0.7</sub>Fe<sub>2</sub>As<sub>2</sub> observed by angle-resolved photoemission spectroscopy'. Together they form a unique fingerprint.

Cite this