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 ($\mu$SR) experiment to determine the superconducting ground state of the iron-based superconductor CsCa${}_2$Fe${}_4$As${}_4$F${}_2$ with $T_{\mathrm{c}}\approx 28.3$K. This compound is related to the fully-gapped superconductor CaCsFe${}_4$As${}_4$, but here the Ca-containing spacer layer is replaced with one containing Ca${}_2$F${}_2$. The temperature evolution of the penetration depth strongly suggests the presence of line nodes and is best modelled by a system consisting of both an $s$- and a $d$-wave gap. We also find a potentially magnetic phase which appears below $\approx 10$K 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 ${\lambda }_{ab}(T=0)=423(5)$nm.

6 pages, 2 figures

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• Spectroscopic Evidence of Bilayer Splitting and Interlayer Pairing in an Iron Based Superconductor
• A brief review on muSR studies of unconventional Fe and Cr-based superconductors
• Friedel Oscillations of Vortex Bound States Under Extreme Quantum Limit in KCa2Fe4As4F2
• Strong Pauli paramagnetic effect in the upper critical field of KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Multigap nodeless superconductivity in CsCa2Fe4As4F2 probed by heat transport
• Band-selective clean- and dirty-limit superconductivity with nodeless gaps in the bilayer iron-based superconductor CsCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Single particle tunneling spectroscopy and superconducting gaps in layered iron based superconductor KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Phase coherence of pairs of Cooper pairs as quasi-long-range order of half-vortex pairs in a two-dimensional bilayer system
• Low temperature specific heat of 12442-type KCa_2Fe_4As_4F_2 single crystals
• Multigap superconductivity in RbCa2Fe4As4F2 investigated using muSR measurements
• Nodal multigap superconductivity in the anisotropic iron-based compound RbCa2Fe4As4F2
• Observation of a neutron spin resonance in the bilayered superconductor CsCa2Fe4As4F2
• Pseudogap and Strong Pairing Induced by Incipient and Shallow Bands in the Quasi-Two-Dimensional KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Spectroscopic studies of the superconducting gap in the 12442 family of iron-based compounds
• Evidence of electron interaction with an unidentified bosonic mode in superconductor CsCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Probing the superconducting gap structure of ScRuSi via $\mu$SR and first-principles calculations
• Unusually weak irradiation effects in anisotropic iron-based superconductor RbCa2Fe4As4F2
• Interplay of electron-phonon coupling, pseudogap, and superconductivity in CsCa${}_2$Fe${}_4$As${}_4$F${}_2$ studied using ultrafast optical spectroscopy
• Superconductivity of Co-Doped CaKFe4As4 Investigated via Point-Contact Spectroscopy and London Penetration Depth Measurements
• Multiband superconductivity and a deep gap minimum from the specific heat in KCa${}_2$(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$F${}_2$ ($x$ = 0, 0.05, 0.13)
• Decoupled interband pairing in a bilayer iron-based superconductor evidenced by ultrahigh-resolution ARPES