Intrinsic Charge Dynamics in High-Tc AFeAs(O,F) Superconductors

Charnukha, A.; Pröpper, D.; Zhigadlo, N.; Naito, M.; Schmidt, M.; Wang, Z.; Deisenhofer, J.; Loidl, A.; Keimer, B.; Boris, A.; Basov, D.

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Intrinsic Charge Dynamics in High-T_c AFeAs(O,F) Superconductors

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Schmidt, M.
Research Group Organic Electronics (Hagen Klauk), Max Planck Institute for Solid State Research, Max Planck Society;

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Keimer, B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Boris, A.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Charnukha, A., Pröpper, D., Zhigadlo, N., Naito, M., Schmidt, M., Wang, Z., et al. (2018). Intrinsic Charge Dynamics in High-T_c AFeAs(O,F) Superconductors. Physical Review Letters, 120(8): 087001.

Cite as: https://hdl.handle.net/21.11116/0000-000E-D1D4-6

Abstract

We report the first determination of the in-plane complex optical conductivity of 1111 high-T-c superconducting iron oxypnictide single crystals PrFeAs(O,F) and thin films SmFeAs(O,F) by means of conventional and microfocused infrared spectroscopy, ellipsometry, and time-domain THz transmission spectroscopy. A strong itinerant contribution is found to exhibit a dramatic difference in coherence between the crystal and the film. Using extensive temperature-dependent measurements of THz transmission, we identify a previously undetected 2.5-meV collective mode in the optical conductivity of SmFeAs(O,F), which is strongly suppressed at T-c and experiences an anomalous T-linear softening and narrowing below T* approximate to 110 K >> T-c. The suppression of the infrared absorption in the superconducting state reveals a large optical superconducting gap with a similar gap ratio 2 Delta/k(B)T(c) approximate to 7 in both materials, indicating strong pairing.