Superconducting gap symmetry in the superconductor BaFe1.9Ni0.1As2
T. E. Kuzmicheva, S. A. Kuzmichev, A. V. Sadakov, S. Yu. Gavrilkin, A. Yu. Tsvetkov, X. Lu, H. Luo, A. N. Vasiliev, V. M. Pudalov, Xiao-Jia Chen, Mahmoud Abdel-Hafiez
DOI 10.1103/PhysRevB.97.235106 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We report on the Andreev spectroscopy and specific heat of high-quality single crystals of BaFe1.9Ni0.1As2. The intrinsic multiple Andreev reflection spectroscopy reveals two anisotropic superconducting gaps ΔL≈3.2−4.5meV, ΔS≈1.2−1.6meV (the ranges correspond to the minimum and maximum value of the coupling energy in the kxky plane). The 25%−30% anisotropy shows the absence of nodes in the superconducting gaps. Using a two-band model with s-wave-like gaps ΔL≈3.2meV and ΔS≈1.6meV, the temperature dependence of the electronic specific heat can be well described. A linear magnetic field dependence of the low-temperature specific heat offers further support of s-wave type of the order parameter. We find that a d-wave or single-gap BCS theory under the weak-coupling approach cannot describe our experiments.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe1.9Ni0.1As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18.5 | Pressure not reported | onset |
| BaFe1.9Ni0.1As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18.5 | Pressure not reported | onset |
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| RbFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| K1-xNaxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| BaFe2(As0.7P0.3)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NaFe1-xCoxAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Competition between superconductivity and magnetic/nematic order as a source of anisotropic superconducting gap in underdoped Ba1−xKxFe2As2
similarity 0.97H. Kim et al.
Source status unknown — claims are unverified
Impact of local-moment fluctuations on the magnetic degeneracy of iron arsenide superconductors
similarity 0.96Xiaoyu Wang & Rafael M. Fernandes
Source status unknown — claims are unverified
Anomalous proximity effects at the interface of s- and s±- superconductors
similarity 0.96Valentin G. Stanev & Alexei E. Koshelev
Source status unknown — claims are unverified
Gap nodes induced by coexistence with antiferromagnetism in iron-based superconductors
similarity 0.95S. Maiti et al.
Source status unknown — claims are unverified
Superconducting pairing in the spin-density-wave phase of iron pnictides
similarity 0.95Jacob Schmiedt et al.
Source status unknown — claims are unverified
Time-reversal symmetry breaking from lattice dislocations in superconductors
similarity 0.95Clara N. Breiø et al.
Source status unknown — claims are unverified