Nodeless multigap superconductivity in organic-ion-intercalated (tetrabutyl~ammonium)${}_{0.3}$FeSe

Abstract

We probe the superconducting order parameter of the organic-ion-intercalated FeSe-based superconductor (tetrabutyl ammonium)${}_{0.3}$FeSe [(TBA)${}_{0.3}$FeSe] using muon-spin relaxation/rotation ($\mu$SR). Zero-field $\mu$SR measurements show only a weak temperature dependence with no evidence for magnetic ordering or broken time-reversal symmetry in the superconducting state. The temperature dependence of the superfluid density is deduced from transverse-field $\mu$SR measurements with fields applied both parallel and perpendicular to the $c$~axis axis, and can be well described by a nodeless two-gap $s+s$ wave model. These properties are reminiscent of those of (Li${}_{1-x}$Fe${}_x$)OHFe${}_{1-y}$Se, which also has a comparably enhanced $T_c$, suggesting that such a gap structure is a common feature of quasi-two-dimensional intercalated FeSe-based superconductors.

arXiv comment8 pages, 5 figures

References in corpus (38)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Phase Diagram and High Temperature Superconductivity at 65 K in Tuning Carrier Concentration of Single-Layer FeSe Films
• Pressure evolution of low-temperature crystal structure and bonding of 37 K $T_c$ FeSe superconductor
• Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor
• Heavily electron-doped electronic structure and isotropic superconducting gap in AxFe2Se2 (A=K,Cs)
• Enhancement of superconducting transition temperature of FeSe by intercalation of a molecular spacer layer
• Structure determination and coexistence of superconductivity and antiferromagnetic order in (Li0.8Fe0.2)OHFeSe
• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Discovery of Orbital-Selective Cooper Pairing in FeSe
• Properties of the Ideal Ginzburg-Landau Vortex Lattice
• Phase Separation and Magnetic Order in K-doped Iron Selenide Superconductor
• Common Electronic Origin of Superconductivity in (Li,Fe)OHFeSe Bulk Superconductor and Single-Layer FeSe/SrTiO3 Films
• Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by scanning tunneling microscopy
• Electronic identification of the actual parental phase of KxFe2-ySe2 superconductor and its intrinsic mesoscopic phase separation
• Strong nodeless pairing on separate electron Fermi surface sheets in (Tl, K)Fe${}_{1.78}$Se${}_2$ probed by ARPES
• (Li0.84Fe0.16)OHFe0.98Se superconductor: Ion-exchange synthesis of large single crystal and highly two-dimensional electron properties
• Surface electronic structure and isotropic superconducting gap in (Li${}_{0.8}$Fe${}_{0.2}$)OHFeSe
• NMR Study in the Iron-Selenide Rb0.74Fe1.6Se2: Determination of the Superconducting Phase as Iron Vacancy-Free Rb0.3Fe2Se2
• Soft chemical control of superconductivity in lithium iron selenide hydroxides Li1-xFex(OH)Fe1-ySe
• Superconducting gap anisotropy in monolayer FeSe thin film
• Symmetry analysis of possible superconducting states in KxFe2Se2 superconductors
• Coexistence of superconductivity and antiferromagnetism in single crystals $A_{0.8}F{e}_{2-y}S{e}_2$ (A= K, Rb, Cs, Tl/K and Tl/Rb): evidence from magnetization and resistivity
• Scrutinizing the double superconducting gaps and strong coupling pairing in (Li1-xFexOH)FeSe
• Preformed Cooper pairs in layered FeSe-based superconductors
• Experimental Demonstration of the Sign Reversal of the Order Parameter in (Li1-xFex)OHFe1-yZnySe
• Surface electronic structure and evidence of plain s-wave superconductivity in (Li0.8Fe0.2)OHFeSe
• Superconducting gap structure of FeSe
• Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors
• Proximity induced superconductivity within the insulating (Li${}_{0.84}$Fe${}_{0.16}$)OH layers in (Li${}_{0.84}$Fe${}_{0.16}$)OHFe${}_{0.98}$Se
• Highly anisotropic superconducting gaps and possible evidence of antiferromagnetic order in FeSe single crystals
• Superconductivity-enhanced Nematicity and '$s+d$' Gap Symmetry in Fe(Se${}_{1-x}$S${}_x$)
• Spin resonance in the superconducting state of Li${}_{1-x}$Fe${}_x$ODFe${}_{1-y}$Se observed by neutron spectroscopy
• Evidence of nodal gap structure in the basal plane of the FeSe superconductor
• Probing the superconducting gap structure of (Li${}_{1-x}$Fe${}_x$)OHFeSe