Orbital-dependent modulation of the superconducting gap in uniaxially strained Ba0.6K0.4Fe2As2
L. Chen, T. T. Han, C. Cai, Z. G. Wang, Y. D. Wang, Z. M. Xin, Y. Zhang
DOI 10.1103/PhysRevB.104.L060502 · Physical Review B
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Abstract
Pairing symmetry which characterizes the superconducting pairing mechanism is normally determined by measuring the superconducting gap structure (|Δk|). Here, we report the measurement of a strain-induced gap modulation (∂|Δk|) in uniaxially strained Ba0.6K0.4Fe2As2 utilizing angle-resolved photoemission spectroscopy and in situ strain tuning. We found that the uniaxial strain drives Ba0.6K0.4Fe2As2 into a nematic superconducting state which breaks the fourfold rotational symmetry of the superconducting pairing. The superconducting gap increases on the dyz electron and hole pockets while it decreases on the dxz counterparts. Such orbital selectivity indicates that orbital-selective pairing exists intrinsically in non-nematic iron-based superconductors. The dxz and dyz pairing channels are balanced originally in the pristine superconducting state, but become imbalanced under uniaxial strain. Our results highlight the important role of intraorbital scattering in mediating the superconducting pairing in iron-based superconductors. It also highlights the measurement of ∂|Δk| as an effective way to characterize the superconducting pairing from a perturbation perspective.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | onset |
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