Power-law-like correlation between condensation energy and superconducting transition temperatures in iron pnictide/chalcogenide superconductors: Beyond the BCS understanding
Jie Xing, Sheng Li, Bin Zeng, Gang Mu, Bing Shen, J. Schneeloch, R. D. Zhong, T. S. Liu, G. D. Gu, Hai-Hu Wen
DOI 10.1103/PhysRevB.89.140503 · Physical Review B
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Abstract
Superconducting condensation energy U0int has been determined by integrating the electronic entropy in various iron pnictide/chalcogenide superconducting systems. It is found that U0int∝Tcn with n=3–4, which is in sharp contrast to the simple BCS prediction U0BCS=1/2NFΔs2, with NF the quasiparticle density of states at the Fermi energy and Δs the superconducting gap. A similar correlation holds if we compute the condensation energy through U0cal=3γneffΔs2/4π2kB2, with γneff the effective normal state electronic specific heat coefficient. This indicates a general relationship γneff∝Tcm with m=1–2, which is not predicted by the BCS scheme. A picture based on quantum criticality is proposed to explain this phenomenon.
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 |
| Ba(Fe0.92Co0.08)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | 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. | 20 | Pressure not reported | onset |
| FeSe0.5Te0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.5 | Pressure not reported | onset |
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