Observation of strong-coupling pairing with weakened fermi-surface nesting at optimal hole doping in Ca0.33Na0.67Fe 2As2

Ying Bo Shi; Yao Bo Huang; Xiao Ping Wang; Xun Shi; A. Van Roekeghem; Wei Lu Zhang; Na Xu; Pierre Richard; Tian Qian; Emile Rienks; S. Thirupathaiah; Kan Zhao; Chang Qing Jin; Ming Shi; Hong Ding

doi:10.1088/0256-307X/31/6/067403

Observation of strong-coupling pairing with weakened fermi-surface nesting at optimal hole doping in Ca_0.33Na_0.67Fe ₂As₂

Ying Bo Shi, Yao Bo Huang, Xiao Ping Wang, Xun Shi, A. Van Roekeghem, Wei Lu Zhang, Na Xu, Pierre Richard^*, Tian Qian, Emile Rienks, S. Thirupathaiah, Kan Zhao, Chang Qing Jin, Ming Shi, Hong Ding

^*Corresponding author for this work

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

6 Citations (Scopus)

Abstract

We report an angle-resolved photoemission investigation of optimally doped Ca0.33Na0.67Fe2As2. The Fermi surface topology of this compound is similar to that of the well-studied Ba0.6K0.4Fe2As2 material, except for larger hole pockets resulting from a higher hole concentration per Fe atoms. We find that the quasi-nesting conditions are weakened in this compound compared to Ba0.6K0.4Fe2As2. Similar to Ba0.6K0.4Fe2As2, we observe nearly isotropic superconducting gaps with Fermi surface-dependent magnitudes for Ca0.33Na0.67Fe2As2. A small variation in the gap size along the momentum direction perpendicular to the surface is found for one of the Fermi surfaces. Our superconducting gap results on all Fermi surface sheets fit simultaneously very well to a global gap function derived from a strong coupling approach, which contains only 2 global parameters.

Original language	English
Article number	067403
Journal	Chinese Physics Letters
Volume	31
Issue number	6
DOIs	https://doi.org/10.1088/0256-307X/31/6/067403
Publication status	Published - Jun 2014
Externally published	Yes

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Shi, Y. B., Huang, Y. B., Wang, X. P., Shi, X., Roekeghem, A. V., Zhang, W. L., Xu, N., Richard, P., Qian, T., Rienks, E., Thirupathaiah, S., Zhao, K., Jin, C. Q., Shi, M., & Ding, H. (2014). Observation of strong-coupling pairing with weakened fermi-surface nesting at optimal hole doping in Ca_0.33Na_0.67Fe ₂As₂. Chinese Physics Letters, 31(6), Article 067403. https://doi.org/10.1088/0256-307X/31/6/067403

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title = "Observation of strong-coupling pairing with weakened fermi-surface nesting at optimal hole doping in Ca0.33Na0.67Fe 2As2",

abstract = "We report an angle-resolved photoemission investigation of optimally doped Ca0.33Na0.67Fe2As2. The Fermi surface topology of this compound is similar to that of the well-studied Ba0.6K0.4Fe2As2 material, except for larger hole pockets resulting from a higher hole concentration per Fe atoms. We find that the quasi-nesting conditions are weakened in this compound compared to Ba0.6K0.4Fe2As2. Similar to Ba0.6K0.4Fe2As2, we observe nearly isotropic superconducting gaps with Fermi surface-dependent magnitudes for Ca0.33Na0.67Fe2As2. A small variation in the gap size along the momentum direction perpendicular to the surface is found for one of the Fermi surfaces. Our superconducting gap results on all Fermi surface sheets fit simultaneously very well to a global gap function derived from a strong coupling approach, which contains only 2 global parameters.",

author = "Shi, {Ying Bo} and Huang, {Yao Bo} and Wang, {Xiao Ping} and Xun Shi and Roekeghem, {A. Van} and Zhang, {Wei Lu} and Na Xu and Pierre Richard and Tian Qian and Emile Rienks and S. Thirupathaiah and Kan Zhao and Jin, {Chang Qing} and Ming Shi and Hong Ding",

year = "2014",

month = jun,

doi = "10.1088/0256-307X/31/6/067403",

language = "English",

volume = "31",

journal = "Chinese Physics Letters",

issn = "0256-307X",

publisher = "IOP Publishing Ltd.",

number = "6",

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Shi, YB, Huang, YB, Wang, XP, Shi, X, Roekeghem, AV, Zhang, WL, Xu, N, Richard, P, Qian, T, Rienks, E, Thirupathaiah, S, Zhao, K, Jin, CQ, Shi, M & Ding, H 2014, 'Observation of strong-coupling pairing with weakened fermi-surface nesting at optimal hole doping in Ca_0.33Na_0.67Fe ₂As₂', Chinese Physics Letters, vol. 31, no. 6, 067403. https://doi.org/10.1088/0256-307X/31/6/067403

TY - JOUR

T1 - Observation of strong-coupling pairing with weakened fermi-surface nesting at optimal hole doping in Ca0.33Na0.67Fe 2As2

AU - Shi, Ying Bo

AU - Huang, Yao Bo

AU - Wang, Xiao Ping

AU - Shi, Xun

AU - Roekeghem, A. Van

AU - Zhang, Wei Lu

AU - Xu, Na

AU - Richard, Pierre

AU - Qian, Tian

AU - Rienks, Emile

AU - Thirupathaiah, S.

AU - Zhao, Kan

AU - Jin, Chang Qing

AU - Shi, Ming

AU - Ding, Hong

PY - 2014/6

Y1 - 2014/6

N2 - We report an angle-resolved photoemission investigation of optimally doped Ca0.33Na0.67Fe2As2. The Fermi surface topology of this compound is similar to that of the well-studied Ba0.6K0.4Fe2As2 material, except for larger hole pockets resulting from a higher hole concentration per Fe atoms. We find that the quasi-nesting conditions are weakened in this compound compared to Ba0.6K0.4Fe2As2. Similar to Ba0.6K0.4Fe2As2, we observe nearly isotropic superconducting gaps with Fermi surface-dependent magnitudes for Ca0.33Na0.67Fe2As2. A small variation in the gap size along the momentum direction perpendicular to the surface is found for one of the Fermi surfaces. Our superconducting gap results on all Fermi surface sheets fit simultaneously very well to a global gap function derived from a strong coupling approach, which contains only 2 global parameters.

AB - We report an angle-resolved photoemission investigation of optimally doped Ca0.33Na0.67Fe2As2. The Fermi surface topology of this compound is similar to that of the well-studied Ba0.6K0.4Fe2As2 material, except for larger hole pockets resulting from a higher hole concentration per Fe atoms. We find that the quasi-nesting conditions are weakened in this compound compared to Ba0.6K0.4Fe2As2. Similar to Ba0.6K0.4Fe2As2, we observe nearly isotropic superconducting gaps with Fermi surface-dependent magnitudes for Ca0.33Na0.67Fe2As2. A small variation in the gap size along the momentum direction perpendicular to the surface is found for one of the Fermi surfaces. Our superconducting gap results on all Fermi surface sheets fit simultaneously very well to a global gap function derived from a strong coupling approach, which contains only 2 global parameters.

UR - http://www.scopus.com/inward/record.url?scp=84901989966&partnerID=8YFLogxK

U2 - 10.1088/0256-307X/31/6/067403

DO - 10.1088/0256-307X/31/6/067403

M3 - Article

AN - SCOPUS:84901989966

SN - 0256-307X

VL - 31

JO - Chinese Physics Letters

JF - Chinese Physics Letters

IS - 6

M1 - 067403

ER -

Observation of strong-coupling pairing with weakened fermi-surface nesting at optimal hole doping in Ca_0.33Na_0.67Fe ₂As₂

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