Electronic phase diagram of the iron-based high-Tc superconductor Ba(Fe1−xCox)2As2 under hydrostatic pressure (0≤x≤0.099)
K. Ahilan, F. L. Ning, T. Imai, A. S. Sefat, M. A. McGuire, B. C. Sales, D. Mandrus
DOI 10.1103/PhysRevB.79.214520 · Physical Review B
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Abstract
We report comprehensive resistivity measurements of single-crystalline samples of the Ba(Fe1−xCox)2As2 high-Tc superconductor under hydrostatic pressure up to 2.75 GPa and over a broad concentration range, 0≤x≤0.099. We show that application of pressure progressively suppresses the spin-density wave (SDW) transition temperature, TSDW, in the underdoped regime (x≲0.051). There is no sign of pressure-induced superconductivity in the undoped BaFe2As2 down to 1.8 K but applied pressure dramatically enhances Tc in the underdoped regime 0.02≲x≲0.051. The effect of pressure on Tc is very small in the optimally and overdoped regimes 0.082≲x≲0.099. As a consequence, the dome of the superconducting phase extends to x≲0.02 under pressure. We discuss the implications of our findings in the context of a possible quantum phase transition between the SDW and superconducting phases.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 2.75 GPa | unknown |
| Ba(Fe0.98Co0.02)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
| Ba(Fe0.96Co0.04)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11 | Pressure unresolved | onset |
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