Intrinsic Charge Dynamics in High-Tc AFeAs(O,F) Superconductors
A. Charnukha, D. Pröpper, N. D. Zhigadlo, M. Naito, M. Schmidt, Zhe Wang, J. Deisenhofer, A. Loidl, B. Keimer, A. V. Boris, D. N. Basov
DOI 10.1103/PhysRevLett.120.087001 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We report the first determination of the in-plane complex optical conductivity of 1111 high-Tc 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 Tc and experiences an anomalous T-linear softening and narrowing below T*≈110 K≫Tc. The suppression of the infrared absorption in the superconducting state reveals a large optical superconducting gap with a similar gap ratio 2Δ/kBTc≈7 in both materials, indicating strong pairing.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PrFeAsO0.6F0.35 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | onset |
| SmFeAs(O,F) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 55 | Pressure not reported | onset |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure not reported | unknown |
Similar papers
Superconductivity in FeSe Thin Films Driven by the Interplay between Nematic Fluctuations and Spin-Orbit Coupling
similarity 0.96Jian Kang & Rafael M. Fernandes
Source status unknown — claims are unverified
Evolution of High-Temperature Superconductivity from a Low-Tc Phase Tuned by Carrier Concentration in FeSe Thin Flakes
similarity 0.95B. Lei et al.
Source status unknown — claims are unverified
Enhancement of superconducting transition temperature by pointlike disorder and anisotropic energy gap in FeSe single crystals
similarity 0.95S. Teknowijoyo et al.
Source status unknown — claims are unverified
Discrete superconducting phases in proton-intercalated FeSe thin flakes
similarity 0.95W. X. Wang et al.
Source status unknown — claims are unverified
Elucidating the magnetic and superconducting phases in the alkali metal intercalated iron chalcogenides
similarity 0.95Meng Wang et al.
Source status unknown — claims are unverified
Distinct Electronic Origins of Superconductivity and Nematicity in FeSe
similarity 0.95Xueying Ma et al.
Source status unknown — claims are unverified