Band structure and fermi surface of an extremely overdoped iron-based superconductor KFe2As2

T. Sato; K. Nakayama; Y. Sekiba; P. Richard; Y. M. Xu; S. Souma; T. Takahashi; G. F. Chen; J. L. Luo; N. L. Wang; H. Ding

doi:10.1103/PhysRevLett.103.047002

Band structure and fermi surface of an extremely overdoped iron-based superconductor KFe2As2

T. Sato, K. Nakayama, Y. Sekiba, P. Richard, Y. M. Xu, S. Souma, T. Takahashi, G. F. Chen, J. L. Luo, N. L. Wang, H. Ding

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

178 Citations (Scopus)

Abstract

We have performed high-resolution angle-resolved photoemission spectroscopy on heavily overdoped KFe2As2 (transition temperature Tc=3K). We observed several renormalized bands near the Fermi level with a renormalization factor of 2-4. While the Fermi surface around the Brillouin-zone center is qualitatively similar to that of optimally doped Ba1-xKxFe2As2 (x=0.4; Tc=37K), the Fermi surface topology around the zone corner (M point) is markedly different: the two electron Fermi surface pockets are completely absent due to an excess of hole doping. This result indicates that the electronic states around the M point play an important role in the high-Tc superconductivity of Ba1-xKxFe2As2 and suggests that the interband scattering via the antiferromagnetic wave vector essentially controls the Tc value in the overdoped region.

Original language	English
Article number	047002
Journal	Physical review letters
Volume	103
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.103.047002
Publication status	Published - 2009 Aug 6

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Band structure and fermi surface of an extremely overdoped iron-based superconductor KFe2As2",

abstract = "We have performed high-resolution angle-resolved photoemission spectroscopy on heavily overdoped KFe2As2 (transition temperature Tc=3K). We observed several renormalized bands near the Fermi level with a renormalization factor of 2-4. While the Fermi surface around the Brillouin-zone center is qualitatively similar to that of optimally doped Ba1-xKxFe2As2 (x=0.4; Tc=37K), the Fermi surface topology around the zone corner (M point) is markedly different: the two electron Fermi surface pockets are completely absent due to an excess of hole doping. This result indicates that the electronic states around the M point play an important role in the high-Tc superconductivity of Ba1-xKxFe2As2 and suggests that the interband scattering via the antiferromagnetic wave vector essentially controls the Tc value in the overdoped region.",

author = "T. Sato and K. Nakayama and Y. Sekiba and P. Richard and Xu, {Y. M.} and S. Souma and T. Takahashi and Chen, {G. F.} and Luo, {J. L.} and Wang, {N. L.} and H. Ding",

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doi = "10.1103/PhysRevLett.103.047002",

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T1 - Band structure and fermi surface of an extremely overdoped iron-based superconductor KFe2As2

AU - Sato, T.

AU - Nakayama, K.

AU - Sekiba, Y.

AU - Richard, P.

AU - Xu, Y. M.

AU - Souma, S.

AU - Takahashi, T.

AU - Chen, G. F.

AU - Luo, J. L.

AU - Wang, N. L.

AU - Ding, H.

PY - 2009/8/6

Y1 - 2009/8/6

N2 - We have performed high-resolution angle-resolved photoemission spectroscopy on heavily overdoped KFe2As2 (transition temperature Tc=3K). We observed several renormalized bands near the Fermi level with a renormalization factor of 2-4. While the Fermi surface around the Brillouin-zone center is qualitatively similar to that of optimally doped Ba1-xKxFe2As2 (x=0.4; Tc=37K), the Fermi surface topology around the zone corner (M point) is markedly different: the two electron Fermi surface pockets are completely absent due to an excess of hole doping. This result indicates that the electronic states around the M point play an important role in the high-Tc superconductivity of Ba1-xKxFe2As2 and suggests that the interband scattering via the antiferromagnetic wave vector essentially controls the Tc value in the overdoped region.

AB - We have performed high-resolution angle-resolved photoemission spectroscopy on heavily overdoped KFe2As2 (transition temperature Tc=3K). We observed several renormalized bands near the Fermi level with a renormalization factor of 2-4. While the Fermi surface around the Brillouin-zone center is qualitatively similar to that of optimally doped Ba1-xKxFe2As2 (x=0.4; Tc=37K), the Fermi surface topology around the zone corner (M point) is markedly different: the two electron Fermi surface pockets are completely absent due to an excess of hole doping. This result indicates that the electronic states around the M point play an important role in the high-Tc superconductivity of Ba1-xKxFe2As2 and suggests that the interband scattering via the antiferromagnetic wave vector essentially controls the Tc value in the overdoped region.

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