Enhancement of Tc by disorder in underdoped iron pnictide superconductors
R. M. Fernandes, M. G. Vavilov, A. V. Chubukov
DOI 10.1103/PhysRevB.85.140512 · Physical Review B
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Abstract
We analyze how disorder affects the transition temperature Tc of the s+− superconducting state in the iron pnictides. The conventional wisdom is that Tc should rapidly decrease with increasing inter-band nonmagnetic impurity scattering, but we show that this behavior holds only in the overdoped region of the phase diagram. In the underdoped regime, where superconductivity emerges from a pre-existing magnetic state, disorder gives rise to two competing effects: breaking of the Cooper pairs, which tends to reduce Tc, and suppression of the itinerant magnetic order, which tends to bring Tc up. We show that for a wide range of parameters the second effect wins; i.e., in the coexistence state Tc can increase with disorder. Our results provide an explanation for several recent experimental findings and lend additional support to s+− pairing in the iron pnictides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAs(O1-xFx) 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 |
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