Robust Nodal Superconductivity Induced by Isovalent Doping in Ba(Fe1−xRux)2As2 and BaFe2(As1−xPx)2
X. Qiu, S. Y. Zhou, H. Zhang, B. Y. Pan, X. C. Hong, Y. F. Dai, Man Jin Eom, Jun Sung Kim, Z. R. Ye, Y. Zhang, D. L. Feng, S. Y. Li
DOI 10.1103/PhysRevX.2.011010 · Physical Review X
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Abstract
We present the ultra-low-temperature heat-transport study of iron-based superconductors Ba(Fe1−xRux)2As2 and BaFe2(As1−xPx)2. For optimally doped Ba(Fe0.64Ru0.36)2As2, a large residual κ0/T at zero field and a H dependence of κ0(H)/T are observed, which provide strong evidences for nodes in the superconducting gap. This result demonstrates one more nodal superconductor in iron pnictides. The similarities between isovalent Fe and P dopings strongly suggest that the nodal superconductivity in Ba(Fe0.64Ru0.36)2As2 may have the same origin as in BaFe2(As0.67P0.33)2. Furthermore, in underdoped Ba(Fe0.77Ru0.23)2As2 and strongly underdoped BaFe2(As0.82P0.18)2, κ0/T manifests similar nodal behavior, which result shows the robustness of nodal superconductivity in the underdoped regime and puts constraint on theoretical models.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe0.64Ru0.36)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | zero_resistance |
| Ba(Fe0.77Ru0.23)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | zero_resistance |
| BaFe2(As0.82P0.18)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | zero_resistance |
| BaFe2(As0.67P0.33)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| LaFePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | unknown |
| LiFeP Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | unknown |
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