Optical study of BaFe2As2 under pressure: Coexistence of spin-density-wave gap and superconductivity
E. Uykur, T. Kobayashi, W. Hirata, S. Miyasaka, S. Tajima, C. A. Kuntscher
DOI 10.1103/PhysRevB.92.245133 · Physical Review B
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Abstract
Temperature-dependent reflectivity measurements in the frequency range 85–7000cm−1 were performed on BaFe2As2 single crystals under pressure up to ∼5 GPa. The corresponding pressure- and temperature-dependent optical conductivity was analyzed with the Drude-Lorentz model to extract the coherent and incoherent contributions. The gradual suppression of the spin-density-wave (SDW) state with increasing pressure and the appearance of the superconducting phase coexisting with the SDW phase at 3.6 GPa were observed. At 3.6 GPa, the reflectivity reaches unity below ∼95 cm−1 indicating the opening of the superconducting gap and shows a full gap tendency at 6 K.
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. | 30 | Pressure not reported | unknown |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 3.6 GPa | onset |
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