Universal pair-breaking in transition-metal-substituted iron-pnictide superconductors
Kevin Kirshenbaum, S. R. Saha, S. Ziemak, T. Drye, J. Paglione
DOI 10.1103/PhysRevB.86.140505 · Physical Review B
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Abstract
The experimental transport scattering rate was determined for a wide range of optimally doped transition-metal-substituted FeAs-based compounds with the ThCr2Si2 (122) crystal structure. The maximum transition temperature Tc for several Ba-, Sr-, and Ca-based 122 systems follows a universal rate of suppression with increasing scattering rate indicative of a common pair-breaking mechanism. Extraction of standard pair-breaking parameters puts a limit of ∼26 K on the maximum Tc for all transition-metal-substituted 122 systems, in agreement with experimental observations, and sets a critical scattering rate of 1.5×1014 s−1 for the suppression of the superconducting phase. The observed critical scattering rate is much weaker than that expected for a sign-changing order parameter with strong interband scattering, providing important constraints on the nature of the superconducting gap in the 122 family of iron-based superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SrFe2-xNixAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | Pressure not reported | midpoint |
| SrFe2-xPtxAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | Pressure not reported | midpoint |
| SrFe2-xCoxAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | midpoint |
| SrFe2-xRhxAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | midpoint |
| SrFe2-xIrxAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | midpoint |
| SrFe2-xPdxAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | midpoint |
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