Observation of Fermi-surface–dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
By H. Ding, P. Richard, K. Nakayama, K. Sugawara, T. Arakane, Y. Sekiba, A. Takayama, S. Souma, Takafumi Sato, Takashi Takahashi and 6 more. 2008
648 citations recorded by the source corpus.
We have performed a high-resolution angle-resolved photoelectron spectroscopy study on the newly discovered superconductor Ba0.6K0.4Fe2As2 (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.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/30b30e3365059d8f801fa2b312a1b67941dd7820
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In Condensed Matter Physics
In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Angle-resolved photoemission studies of quantum materials (2020, neutral): “25(b)) (Borisenko et al., 2010; Chen et al., 2010a; deMedici et al., 2014; Ding et al., 2008; Drechsler et al., 2018; Lin et al., 2008; Liu et al., 2011c; Medici, 2015; Miao et al., 2012; Mou et al., 2011; Nakayama et al., 2009; Okazaki et al., 2012; Watson et al., 2015; Xu et al., 2013a; Ye et…”
- London penetration depth in iron-based superconductors (2011, background): “In charge-doped systems, angle-resolved photoemission spectroscopy (ARPES) [81–84] and thermal conductivity [45, 46] consistently show fully gapped Fermi surfaces (however, with gap anisotropy increasing upon departure from optimal doping in the case of thermal conductivity [45]).”