Optical conductivity evidence of clean-limit superconductivity in LiFeAs
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Contributors
Abstract
We measured the optical conductivity of superconducting LiFeAs. In the superconducting state, the formation of the condensate leads to a spectral-weight loss and yields a penetration depth of 225 nm. No sharp signature of the superconducting gap is observed. This suggests that the system is likely in the clean limit. A Drude-Lorentz parametrization of the data in the normal state reveals a quasiparticle scattering rate supportive of spin fluctuations and proximity to a quantum critical point.
Details
Original language | English |
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Article number | 174509 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 91 |
Issue number | 17 |
Publication status | Published - 11 May 2015 |
Peer-reviewed | Yes |