Heat capacity jump at Tc and pressure derivatives of superconducting transition temperature in the Ba1−xNaxFe2As2 (0.1≤x≤0.9) series
Sergey L. Bud'ko, Duck Young Chung, Daniel Bugaris, Helmut Claus, Mercouri G. Kanatzidis, Paul C. Canfield
DOI 10.1103/PhysRevB.89.014510 · Physical Review B
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Abstract
We present the evolution of the initial (up to ∼10 kbar) hydrostatic pressure dependencies of Tc and of the ambient pressure, and the jump in the heat capacity associated with the superconducting transition as a function of Na doping in the Ba1−xNaxFe2As2 family of iron-based superconductors. For Na concentrations 0.15≤x≤0.9, the jump in specific heat at Tc, ΔCp|Tc, follows the ΔCp∝T3 (the so-called BNC scaling) found for most BaFe2As2-based superconductors. This finding suggests that, unlike the related Ba1−xKxFe2As2 series, there is no significant modification of the superconducting state (e.g., change in superconducting gap symmetry) in the Ba1−xNaxFe2As2 series over the whole studied Na concentration range. Pressure dependencies are nonmonotonic for x=0.2 and 0.24. For other Na concentrations, Tc decreases under pressure in an almost linear fashion. The anomalous behavior of the x=0.2 and 0.24 samples under pressure is possibly due to the crossing of the phase boundaries of the narrow antiferromagnetic tetragonal phase, unique for the Ba1−xNaxFe2As2 series, with the application of pressure. The negative sign of the pressure derivatives of Tc across the whole superconducting dome (except for x=0.2) is a clear indication of the nonequivalence of substitution and pressure for the Ba1−xNaxFe2As2 series.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba1-xNaxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | onset |
| Ba0.85Na0.15Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure unresolved | onset |
| Ba0.2Na0.8Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | onset |
| Ba0.7Na0.3Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 0.11 GPa | onset |
| Ba0.7Na0.3Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 0.29 GPa | onset |
| Ba0.7Na0.3Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 0.59 GPa | onset |
| Ba0.7Na0.3Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 1.07 GPa | onset |
| Ba0.8Na0.2Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | onset |
| Ba0.76Na0.24Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | onset |
| Sr1-xNaxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
| NaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11 | Pressure not reported | unknown |
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