Coexistence of clean- and dirty-limit superconductivity in LiFeAs

Y. M. Dai; H. Miao; L. Y. Xing; X. C. Wang; C. Q. Jin; H. Ding; C. C. Homes

doi:10.1103/PhysRevB.93.054508

Coexistence of clean- and dirty-limit superconductivity in LiFeAs

Y. M. Dai
, H. Miao
, L. Y. Xing
, X. C. Wang
, C. Q. Jin
, H. Ding
, C. C. Homes

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

The optical properties of LiFeAs with Tc≃18 K have been determined in the normal and superconducting states. The superposition of two Drude components yields a good description of the low-frequency optical response in the normal state. Below Tc, the optical conductivity reveals two isotropic superconducting gaps with Δ1≃2.9±0.2 meV and Δ2≃5.5±0.4 meV. A comparison between the superconducting-state Mattis-Bardeen and the normal-state Drude components, in combination with a spectral weight analysis, indicates that the spectral weight associated with a band which has a very small scattering rate is fully transferred to the superfluid weight upon the superconducting condensate. These observations provide clear evidence for the coexistence of clean- and dirty-limit superconductivity in LiFeAs.

Original language	English
Article number	054508
Journal	Physical Review B
Volume	93
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.93.054508
State	Published - Feb 8 2016
Externally published	Yes

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title = "Coexistence of clean- and dirty-limit superconductivity in LiFeAs",

abstract = "The optical properties of LiFeAs with Tc≃18 K have been determined in the normal and superconducting states. The superposition of two Drude components yields a good description of the low-frequency optical response in the normal state. Below Tc, the optical conductivity reveals two isotropic superconducting gaps with Δ1≃2.9±0.2 meV and Δ2≃5.5±0.4 meV. A comparison between the superconducting-state Mattis-Bardeen and the normal-state Drude components, in combination with a spectral weight analysis, indicates that the spectral weight associated with a band which has a very small scattering rate is fully transferred to the superfluid weight upon the superconducting condensate. These observations provide clear evidence for the coexistence of clean- and dirty-limit superconductivity in LiFeAs.",

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doi = "10.1103/PhysRevB.93.054508",

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T1 - Coexistence of clean- and dirty-limit superconductivity in LiFeAs

AU - Dai, Y. M.

AU - Miao, H.

AU - Xing, L. Y.

AU - Wang, X. C.

AU - Jin, C. Q.

AU - Ding, H.

AU - Homes, C. C.

PY - 2016/2/8

Y1 - 2016/2/8

N2 - The optical properties of LiFeAs with Tc≃18 K have been determined in the normal and superconducting states. The superposition of two Drude components yields a good description of the low-frequency optical response in the normal state. Below Tc, the optical conductivity reveals two isotropic superconducting gaps with Δ1≃2.9±0.2 meV and Δ2≃5.5±0.4 meV. A comparison between the superconducting-state Mattis-Bardeen and the normal-state Drude components, in combination with a spectral weight analysis, indicates that the spectral weight associated with a band which has a very small scattering rate is fully transferred to the superfluid weight upon the superconducting condensate. These observations provide clear evidence for the coexistence of clean- and dirty-limit superconductivity in LiFeAs.

AB - The optical properties of LiFeAs with Tc≃18 K have been determined in the normal and superconducting states. The superposition of two Drude components yields a good description of the low-frequency optical response in the normal state. Below Tc, the optical conductivity reveals two isotropic superconducting gaps with Δ1≃2.9±0.2 meV and Δ2≃5.5±0.4 meV. A comparison between the superconducting-state Mattis-Bardeen and the normal-state Drude components, in combination with a spectral weight analysis, indicates that the spectral weight associated with a band which has a very small scattering rate is fully transferred to the superfluid weight upon the superconducting condensate. These observations provide clear evidence for the coexistence of clean- and dirty-limit superconductivity in LiFeAs.

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U2 - 10.1103/PhysRevB.93.054508

DO - 10.1103/PhysRevB.93.054508

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VL - 93

JO - Physical Review B

JF - Physical Review B

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ER -

Coexistence of clean- and dirty-limit superconductivity in LiFeAs

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