Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2

H. Ding, P. Richard, K. Nakayama, K. Sugawara, T. Arakane, Y. Sekiba, Akari Takayama, S. Souma, T. Sato, T. Takahashi, Z. Wang, X. Dai, Z. Fang, G. F. Chen, J. L. Luo, N. L. Wang

Research output: Contribution to journalArticle

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Abstract

We have performed a high-resolution angle-resolved photoelectron spectroscopy study on the newly discovered superconductor Ba0.6K 0.4Fe2As2 (Tc=37 K). We have observed two superconducting gaps with different values: a large gap (Δ∼12 meV) on the two small hole-like and electron-like Fermi surface (FS) sheets, and a small gap (∼6 meV) on the large hole-like FS. Both gaps, closing simultaneously at the bulk transition temperature (Tc), are nodeless and nearly isotropic around their respective FS sheets. The isotropic pairing interactions are strongly orbital dependent, as the ratio 2Δ/kBTc switches from weak to strong coupling on different bands. The same and surprisingly large superconducting gap due to strong pairing on the two small FSs, which are connected by the (π, 0) spin-density-wave vector in the parent compound, strongly suggests that the pairing mechanism originates from the inter-band interactions between these two nested FS sheets.

Original languageEnglish
Article number47001
JournalEPL
Volume83
Issue number4
DOIs
Publication statusPublished - 2008 Aug 1
Externally publishedYes

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Fermi surfaces
closing
switches
transition temperature
photoelectron spectroscopy
interactions
orbitals
high resolution
electrons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Ding, H., Richard, P., Nakayama, K., Sugawara, K., Arakane, T., Sekiba, Y., ... Wang, N. L. (2008). Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2. EPL, 83(4), [47001]. https://doi.org/10.1209/0295-5075/83/47001

Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2. / Ding, H.; Richard, P.; Nakayama, K.; Sugawara, K.; Arakane, T.; Sekiba, Y.; Takayama, Akari; Souma, S.; Sato, T.; Takahashi, T.; Wang, Z.; Dai, X.; Fang, Z.; Chen, G. F.; Luo, J. L.; Wang, N. L.

In: EPL, Vol. 83, No. 4, 47001, 01.08.2008.

Research output: Contribution to journalArticle

Ding, H, Richard, P, Nakayama, K, Sugawara, K, Arakane, T, Sekiba, Y, Takayama, A, Souma, S, Sato, T, Takahashi, T, Wang, Z, Dai, X, Fang, Z, Chen, GF, Luo, JL & Wang, NL 2008, 'Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2', EPL, vol. 83, no. 4, 47001. https://doi.org/10.1209/0295-5075/83/47001
Ding H, Richard P, Nakayama K, Sugawara K, Arakane T, Sekiba Y et al. Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2. EPL. 2008 Aug 1;83(4). 47001. https://doi.org/10.1209/0295-5075/83/47001
Ding, H. ; Richard, P. ; Nakayama, K. ; Sugawara, K. ; Arakane, T. ; Sekiba, Y. ; Takayama, Akari ; Souma, S. ; Sato, T. ; Takahashi, T. ; Wang, Z. ; Dai, X. ; Fang, Z. ; Chen, G. F. ; Luo, J. L. ; Wang, N. L. / Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2. In: EPL. 2008 ; Vol. 83, No. 4.
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