Two-gap superconductivity with line nodes in CsCa 2 Fe 4 As 4 F 2

Franziska K.K. Kirschner; Devashibhai T. Adroja; Zhi Cheng Wang; Franz Lang; Michael Smidman; Peter J. Baker; Guang Han Cao; Stephen J. Blundell

doi:10.1103/PhysRevB.97.060506

Two-gap superconductivity with line nodes in CsCa 2 Fe 4 As 4 F 2

Franziska K.K. Kirschner, Devashibhai T. Adroja, Zhi Cheng Wang, Franz Lang, Michael Smidman, Peter J. Baker, Guang Han Cao, Stephen J. Blundell

Physics

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

44 Citations (Scopus)

Abstract

We report the results of a muon-spin rotation (μSR) experiment to determine the superconducting ground state of the iron-based superconductor CsCa2Fe4As4F2 with Tc≈28.3K. This compound is related to the fully gapped superconductor CaCsFe4As4, but here the Ca-containing spacer layer is replaced with one containing Ca2F2. The temperature evolution of the penetration depth strongly suggests the presence of line nodes and is best modeled by a system consisting of both an s- and a d-wave gap. We also find a potentially magnetic phase which appears below ≈10K but does not appear to compete with the superconductivity. This compound contains the largest alkali atom in this family of superconductors, and our results yield a value for the in-plane penetration depth of λab(T=0)=244(3)nm.

Original language	English
Article number	060506
Journal	Physical Review B
Volume	97
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.97.060506
Publication status	Published - 20 Feb 2018

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.97.060506

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title = "Two-gap superconductivity with line nodes in CsCa 2 Fe 4 As 4 F 2",

abstract = "We report the results of a muon-spin rotation (μSR) experiment to determine the superconducting ground state of the iron-based superconductor CsCa2Fe4As4F2 with Tc≈28.3K. This compound is related to the fully gapped superconductor CaCsFe4As4, but here the Ca-containing spacer layer is replaced with one containing Ca2F2. The temperature evolution of the penetration depth strongly suggests the presence of line nodes and is best modeled by a system consisting of both an s- and a d-wave gap. We also find a potentially magnetic phase which appears below ≈10K but does not appear to compete with the superconductivity. This compound contains the largest alkali atom in this family of superconductors, and our results yield a value for the in-plane penetration depth of λab(T=0)=244(3)nm.",

author = "Kirschner, {Franziska K.K.} and Adroja, {Devashibhai T.} and Wang, {Zhi Cheng} and Franz Lang and Michael Smidman and Baker, {Peter J.} and Cao, {Guang Han} and Blundell, {Stephen J.}",

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AU - Kirschner, Franziska K.K.

AU - Adroja, Devashibhai T.

AU - Wang, Zhi Cheng

AU - Lang, Franz

AU - Smidman, Michael

AU - Baker, Peter J.

AU - Cao, Guang Han

AU - Blundell, Stephen J.

PY - 2018/2/20

Y1 - 2018/2/20

N2 - We report the results of a muon-spin rotation (μSR) experiment to determine the superconducting ground state of the iron-based superconductor CsCa2Fe4As4F2 with Tc≈28.3K. This compound is related to the fully gapped superconductor CaCsFe4As4, but here the Ca-containing spacer layer is replaced with one containing Ca2F2. The temperature evolution of the penetration depth strongly suggests the presence of line nodes and is best modeled by a system consisting of both an s- and a d-wave gap. We also find a potentially magnetic phase which appears below ≈10K but does not appear to compete with the superconductivity. This compound contains the largest alkali atom in this family of superconductors, and our results yield a value for the in-plane penetration depth of λab(T=0)=244(3)nm.

AB - We report the results of a muon-spin rotation (μSR) experiment to determine the superconducting ground state of the iron-based superconductor CsCa2Fe4As4F2 with Tc≈28.3K. This compound is related to the fully gapped superconductor CaCsFe4As4, but here the Ca-containing spacer layer is replaced with one containing Ca2F2. The temperature evolution of the penetration depth strongly suggests the presence of line nodes and is best modeled by a system consisting of both an s- and a d-wave gap. We also find a potentially magnetic phase which appears below ≈10K but does not appear to compete with the superconductivity. This compound contains the largest alkali atom in this family of superconductors, and our results yield a value for the in-plane penetration depth of λab(T=0)=244(3)nm.

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Two-gap superconductivity with line nodes in CsCa 2 Fe 4 As 4 F 2

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