Intrinsic Charge Dynamics in High-T_{c} AFeAs(O,F) Superconductors.

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

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

Afiliação

Charnukha A; Physics Department, University of California-San Diego, La Jolla, California 92093, USA.
Pröpper D; Leibniz Institute for Solid State and Materials Research, IFW, 01069 Dresden, Germany.
Zhigadlo ND; Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany.
Naito M; Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany.
Schmidt M; Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Switzerland.
Wang Z; Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland.
Deisenhofer J; Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan.
Loidl A; Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86159 Augsburg, Germany.
Keimer B; Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86159 Augsburg, Germany.
Boris AV; Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86159 Augsburg, Germany.
Basov DN; Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86159 Augsburg, Germany.

Phys Rev Lett ; 120(8): 087001, 2018 Feb 23.

Article em En | MEDLINE | ID: mdl-29543031

ABSTRACT

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^{*}≈110 Kâ«T_{c}. The suppression of the infrared absorption in the superconducting state reveals a large optical superconducting gap with a similar gap ratio 2Δ/k_{B}T_{c}≈7 in both materials, indicating strong pairing.

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Texto completo: 1 Bases de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Estados Unidos