Multigap nodeless superconductivity in CsCa2Fe4As4F2 probed by heat transport

Abstract

Recently, a new family of iron-based superconductors called 12442 was discovered and the muon spin relaxation ($\mu$SR) measurements on KCa${}_2$Fe${}_4$As${}_4$F${}_2$ and CsCa${}_2$Fe${}_4$As${}_4$F${}_2$ polycrystals, two members of the family, indicated that both have a nodal superconducting gap structure with $s+d$ pairing symmetry. Here we report the ultralow-temperature thermal conductivity measurements on CsCa${}_2$Fe${}_4$As${}_4$F${}_2$ single crystals ($T_c$ = 29.3 K). A negligible residual linear term ${\kappa }_0/T$ in zero field and the field dependence of ${\kappa }_0/T$ suggest multiple nodeless superconducting gaps in CsCa${}_2$Fe${}_4$As${}_4$F${}_2$. This gap structure is similar to CaKFe${}_4$As${}_4$ and moderately doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$, but contrasts to the nodal gap structure indicated by the $\mu$SR measurements on CsCa${}_2$Fe${}_4$As${}_4$F${}_2$ polycrystals.

arXiv comment6 pages, 4 figures

References in corpus (44)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity in Iron Compounds
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• The superconductivity at 18 K in LiFeAs system
• FeAs-based superconductivity: a case study of the effects of transition metal doping on BaFe2As2
• Transition of stoichiometricSr2VO3FeAs to a superconducting state at 37.2 K
• Heat Conduction in the Vortex State of NbSe_2: Evidence for Multi-Band Superconductivity
• Heat Transport in a Strongly Overdoped Cuprate: Fermi Liquid and Pure d-wave BCS Superconductor
• Superconductivity at 17 K in (Fe2P2)(Sr4Sc2O6): a new superconducting layered pnictide oxide with a thick perovskite oxide layer
• Quantum criticality and nodal superconductivity in the FeAs-based superconductor KFe2As2
• Iron based high transition temperature superconductors
• Momentum dependence of the superconducting gap in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Evidence for superconducting gap nodes in the zone-centered hole bands of KFe2As2 from magnetic penetration-depth measurements
• Determination of anisotropic Hc2 up to 60 T in (Ba0.55K0.45)Fe2As2 single crystals
• Universal heat conduction in the iron-arsenide superconductor KFe2As2 : Evidence of a d-wave state
• Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1-xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density
• Low temperature specific heat of the hole-doped Ba_{0.6}K_{0.4}Fe_2As_2 single crystals and electron-doped SmFeAsO_{0.9}F_{0.1} samples
• Fully Gapped Superconducting State Based on a High Normal State Quasiparticle Density of States in Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Single Crystals
• Exotic d-wave superconductivity in strongly hole doped K(x)Ba(1-x)Fe2As2
• Anisotropic thermodynamic and transport properties of single crystalline CaKFe${}_4$As${}_4$
• Superconductivity in KCa${}_2$Fe${}_4$As${}_4$F${}_2$ with Separate Double Fe${}_2$As${}_2$ Layers
• Comparative High Field Magneto-Transport of Rare Earth Oxypnictides with Maximum Transition Temperatures
• Possible Multiple Gap Superconductivity with Line Nodes in Heavily Hole-Doped Superconductor KFe2As2 Studied by 75As-NQR and Specific Heat
• Two-gap superconductivity in Ba_1-xK_xFe_2As_2: A complementary study of the magnetic penetration depth by \muSR and ARPES
• Quasiparticle Heat Transport in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$: Evidence for a k-dependent Superconducting Gap without Nodes
• Evidence for two-gap superconductivity in (Ba,K)Fe_2As_2 by directional point contact Andreev reflection spectroscopy
• Strong-coupling Spin-singlet Superconductivity with Multiple Full Gaps in Hole-doped Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Probed by Fe-NMR
• Heat transport as a probe of superconducting gap structure
• Universal Heat Transport in Sr2RuO4
• Enhancement of the superconducting gap by nesting in CaKFe4As4 - a new high temperature superconductor
• Anisotropic spin fluctuations and multiple superconducting gaps in hole-doped Ba_0.7K_0.3Fe_2As_2: NMR in a single crystal
• Crystal Structure and Superconductivity at about 30 K in $A$Ca${}_2$Fe${}_4$As${}_4$F${}_2$ ($A$ = Rb, Cs)
• Nodeless multiband superconductivity in stoichiometric single crystalline CaKFe${}_4$As${}_4$
• Magnetic fluctuations and superconducting properties of CaKFe4As4 studied by 75As NMR
• Fermi surfaces and quasi-particle band dispersions of the iron pnictides superconductor KFe2As2 observed by angle-resolved photoemission spectroscopy
• Nodal multigap superconductivity in KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Two-gap superconductivity with line nodes in CsCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Signature of multigap nodeless superconductivity in CaKFe4As4
• Heat transport in RbFe2As2 single crystal: evidence for nodal superconducting gap
• Spin Resonance in the New-Structure-Type Iron-Based Superconductor CaKFe4As4
• Nodal gap in iron-based superconductor CsFe${}_2$As${}_2$ probed by quasiparticle heat transport
• In-plane magnetic penetration depth of superconducting CaKFe${}_4$As${}_4$
• Multigap superconductivity in RbCa2Fe4As4F2 investigated using muSR measurements
• Doping evolution of the superconducting gap structure in heavily hole-doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$: heat transport study

Cited by in corpus (17)

• Giant anisotropy in superconducting single crystals of CsCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Single-crystal growth and extremely high H_c2 of 12442-type Fe-based superconductor KCa_2Fe_4As_4F_2
• Spectroscopic Evidence of Bilayer Splitting and Interlayer Pairing in an Iron Based Superconductor
• 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${}_2$
• NMR and NQR studies on transition-metal arsenide superconductors LaRu2As2, KCa2Fe4As4F2, and A2Cr3As3
• 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${}_2$
• Low temperature specific heat of 12442-type KCa_2Fe_4As_4F_2 single crystals
• Nodal multigap superconductivity in the anisotropic iron-based compound RbCa2Fe4As4F2
• 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${}_2$
• Anomalous metallic oxygen band in the potential superconductor KCa${}_2$Fe${}_4$As${}_4$O${}_2$
• Interplay of electron-phonon coupling, pseudogap, and superconductivity in CsCa${}_2$Fe${}_4$As${}_4$F${}_2$ studied using ultrafast optical spectroscopy
• 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