Possible nodal superconducting gap and Lifshitz transition in heavily hole-doped Ba 0.1 K 0.9 Fe 2 As 2

N. Xu; P. Richard; X. Shi; A. Van Roekeghem; T. Qian; E. Razzoli; E. Rienks; G. F. Chen; E. Ieki; K. Nakayama; T. Sato; T. Takahashi; M. Shi; H. Ding

doi:10.1103/PhysRevB.88.220508

Possible nodal superconducting gap and Lifshitz transition in heavily hole-doped Ba 0.1 K 0.9 Fe 2 As 2

N. Xu^*, P. Richard, X. Shi, A. Van Roekeghem, T. Qian, E. Razzoli, E. Rienks, G. F. Chen, E. Ieki, K. Nakayama, T. Sato, T. Takahashi, M. Shi, H. Ding

^*Corresponding author for this work

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

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Abstract

We performed a high-energy resolution angle-resolved photoemission spectroscopy investigation of overdoped Ba0.1K0.9Fe2As2 with Tc=9 K. The Fermi surface topology of this material is similar to that of KFe2As2 and differs from that of slightly less doped Ba0.3K0.7Fe2As2, implying that a Lifshitz transition occurred between x=0.7 and x=0.9. Albeit for a vertical node found at the tip of the emerging off-M-centered Fermi surface pocket lobes, the superconducting gap structure is similar to that of Ba0.3K0.7Fe2As2, suggesting that the pairing interaction is not driven by the Fermi surface topology, but nevertheless reveals the possible importance of the Fermi surface topology in shaping the superconducting gap structure.

Original language	English
Article number	220508
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	88
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.88.220508
Publication status	Published - 19 Jan 2013
Externally published	Yes

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Xu, N., Richard, P., Shi, X., Van Roekeghem, A., Qian, T., Razzoli, E., Rienks, E., Chen, G. F., Ieki, E., Nakayama, K., Sato, T., Takahashi, T., Shi, M., & Ding, H. (2013). Possible nodal superconducting gap and Lifshitz transition in heavily hole-doped Ba 0.1 K 0.9 Fe 2 As 2. Physical Review B - Condensed Matter and Materials Physics, 88(22), Article 220508. https://doi.org/10.1103/PhysRevB.88.220508

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title = "Possible nodal superconducting gap and Lifshitz transition in heavily hole-doped Ba 0.1 K 0.9 Fe 2 As 2",

abstract = "We performed a high-energy resolution angle-resolved photoemission spectroscopy investigation of overdoped Ba0.1K0.9Fe2As2 with Tc=9 K. The Fermi surface topology of this material is similar to that of KFe2As2 and differs from that of slightly less doped Ba0.3K0.7Fe2As2, implying that a Lifshitz transition occurred between x=0.7 and x=0.9. Albeit for a vertical node found at the tip of the emerging off-M-centered Fermi surface pocket lobes, the superconducting gap structure is similar to that of Ba0.3K0.7Fe2As2, suggesting that the pairing interaction is not driven by the Fermi surface topology, but nevertheless reveals the possible importance of the Fermi surface topology in shaping the superconducting gap structure.",

author = "N. Xu and P. Richard and X. Shi and {Van Roekeghem}, A. and T. Qian and E. Razzoli and E. Rienks and Chen, {G. F.} and E. Ieki and K. Nakayama and T. Sato and T. Takahashi and M. Shi and H. Ding",

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Xu, N, Richard, P, Shi, X, Van Roekeghem, A, Qian, T, Razzoli, E, Rienks, E, Chen, GF, Ieki, E, Nakayama, K, Sato, T, Takahashi, T, Shi, M & Ding, H 2013, 'Possible nodal superconducting gap and Lifshitz transition in heavily hole-doped Ba 0.1 K 0.9 Fe 2 As 2', Physical Review B - Condensed Matter and Materials Physics, vol. 88, no. 22, 220508. https://doi.org/10.1103/PhysRevB.88.220508

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T1 - Possible nodal superconducting gap and Lifshitz transition in heavily hole-doped Ba 0.1 K 0.9 Fe 2 As 2

AU - Xu, N.

AU - Richard, P.

AU - Shi, X.

AU - Van Roekeghem, A.

AU - Qian, T.

AU - Razzoli, E.

AU - Rienks, E.

AU - Chen, G. F.

AU - Ieki, E.

AU - Nakayama, K.

AU - Sato, T.

AU - Takahashi, T.

AU - Shi, M.

AU - Ding, H.

PY - 2013/1/19

Y1 - 2013/1/19

N2 - We performed a high-energy resolution angle-resolved photoemission spectroscopy investigation of overdoped Ba0.1K0.9Fe2As2 with Tc=9 K. The Fermi surface topology of this material is similar to that of KFe2As2 and differs from that of slightly less doped Ba0.3K0.7Fe2As2, implying that a Lifshitz transition occurred between x=0.7 and x=0.9. Albeit for a vertical node found at the tip of the emerging off-M-centered Fermi surface pocket lobes, the superconducting gap structure is similar to that of Ba0.3K0.7Fe2As2, suggesting that the pairing interaction is not driven by the Fermi surface topology, but nevertheless reveals the possible importance of the Fermi surface topology in shaping the superconducting gap structure.

AB - We performed a high-energy resolution angle-resolved photoemission spectroscopy investigation of overdoped Ba0.1K0.9Fe2As2 with Tc=9 K. The Fermi surface topology of this material is similar to that of KFe2As2 and differs from that of slightly less doped Ba0.3K0.7Fe2As2, implying that a Lifshitz transition occurred between x=0.7 and x=0.9. Albeit for a vertical node found at the tip of the emerging off-M-centered Fermi surface pocket lobes, the superconducting gap structure is similar to that of Ba0.3K0.7Fe2As2, suggesting that the pairing interaction is not driven by the Fermi surface topology, but nevertheless reveals the possible importance of the Fermi surface topology in shaping the superconducting gap structure.

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DO - 10.1103/PhysRevB.88.220508

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SN - 1098-0121

VL - 88

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

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ER -

Possible nodal superconducting gap and Lifshitz transition in heavily hole-doped Ba 0.1 K 0.9 Fe 2 As 2

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