Nodeless two-gap superconducting state in single crystals of the stoichiometric iron pnictide LiFeAs

H. Kim; M. A. Tanatar; Yoo Jang Song; Yong Seung Kwon; R. Prozorov

doi:10.1103/PhysRevB.83.100502

Nodeless two-gap superconducting state in single crystals of the stoichiometric iron pnictide LiFeAs

H. Kim, M. A. Tanatar, Yoo Jang Song, Yong Seung Kwon, R. Prozorov

Department of Physics and Chemistry

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

83 Scopus citations

Abstract

The variations of in- and inter-plane London penetration depths, Δλ(T), were measured using a tunnel diode resonator in single crystals of the intrinsic pnictide superconductor LiFeAs. This compound appears to be in the clean limit with a residual resistivity of 4 (T→0) to 8 (T_c) μΩ cm and a residual resistivity ratio of 65 to 35, respectively. The superfluid density ρ_s(T)=λ2(0)/ λ2(T) is well described by the self-consistent two-gap γ model. Together with the previous data, our results support the universal evolution of the superconducting gap from nodeless to nodal upon departure from optimal doping even in clean systems. We also conclude that pair-breaking scattering plays an important role in the deviation of the low-temperature behavior of λ(T) from the exponential in Fe-based compounds.

Original language	English
Article number	100502
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	83
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.83.100502
State	Published - 9 Mar 2011

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title = "Nodeless two-gap superconducting state in single crystals of the stoichiometric iron pnictide LiFeAs",

abstract = "The variations of in- and inter-plane London penetration depths, Δλ(T), were measured using a tunnel diode resonator in single crystals of the intrinsic pnictide superconductor LiFeAs. This compound appears to be in the clean limit with a residual resistivity of 4 (T→0) to 8 (Tc) μΩ cm and a residual resistivity ratio of 65 to 35, respectively. The superfluid density ρs(T)=λ2(0)/ λ2(T) is well described by the self-consistent two-gap γ model. Together with the previous data, our results support the universal evolution of the superconducting gap from nodeless to nodal upon departure from optimal doping even in clean systems. We also conclude that pair-breaking scattering plays an important role in the deviation of the low-temperature behavior of λ(T) from the exponential in Fe-based compounds.",

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AU - Kim, H.

AU - Tanatar, M. A.

AU - Song, Yoo Jang

AU - Kwon, Yong Seung

AU - Prozorov, R.

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N2 - The variations of in- and inter-plane London penetration depths, Δλ(T), were measured using a tunnel diode resonator in single crystals of the intrinsic pnictide superconductor LiFeAs. This compound appears to be in the clean limit with a residual resistivity of 4 (T→0) to 8 (Tc) μΩ cm and a residual resistivity ratio of 65 to 35, respectively. The superfluid density ρs(T)=λ2(0)/ λ2(T) is well described by the self-consistent two-gap γ model. Together with the previous data, our results support the universal evolution of the superconducting gap from nodeless to nodal upon departure from optimal doping even in clean systems. We also conclude that pair-breaking scattering plays an important role in the deviation of the low-temperature behavior of λ(T) from the exponential in Fe-based compounds.

AB - The variations of in- and inter-plane London penetration depths, Δλ(T), were measured using a tunnel diode resonator in single crystals of the intrinsic pnictide superconductor LiFeAs. This compound appears to be in the clean limit with a residual resistivity of 4 (T→0) to 8 (Tc) μΩ cm and a residual resistivity ratio of 65 to 35, respectively. The superfluid density ρs(T)=λ2(0)/ λ2(T) is well described by the self-consistent two-gap γ model. Together with the previous data, our results support the universal evolution of the superconducting gap from nodeless to nodal upon departure from optimal doping even in clean systems. We also conclude that pair-breaking scattering plays an important role in the deviation of the low-temperature behavior of λ(T) from the exponential in Fe-based compounds.

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Nodeless two-gap superconducting state in single crystals of the stoichiometric iron pnictide LiFeAs

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