Superconductivity at 35 K by self doping in RbGd${}_2$Fe${}_4$As${}_4$O${}_2$

Abstract

We report synthesis, crystal structure and physical properties of a novel quinary compound RbGd${}_2$Fe${}_4$As${}_4$O${}_2$. The new iron oxyarsenide is isostructural to the fluo-arsenide KCa${}_2$Fe${}_4$As${}_4$F${}_2$, both of which contain separate double Fe${}_2$As${}_2$ layers that are self hole-doped in the stoichiometric composition. Bulk superconductivity at $T_{\mathrm{c}}$ = 35 K is demonstrated by the measurements of electrical resistivity, dc magnetic susceptibility and heat capacity. An exceptionally high value of the initial slope of the upper critical field (${\mu }_0$d$H_{c2}$/d$T{|}_{T_{\mathrm{c}}}$ = 16.5 T/K) is measured for the polycrystalline sample.

arXiv comment10 pages, 6 figures, 1 table, the crystal structure is amended

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Cited by in corpus (12)

• Neutron spin resonance in a quasi-two-dimensional iron-based superconductor
• 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
• Synthesis, crystal structure and superconductivity in Rb$L{n}_2$Fe${}_4$As${}_4$O${}_2$ ($Ln$ = Sm, Tb, Dy and Ho)
• Superconductivity at 33 - 37 K in $AL{n}_2$Fe${}_4$As${}_4$O${}_2$ ($A$ = K and Cs; $Ln$ = Lanthanides)
• Strong Pauli paramagnetic effect in the upper critical field of KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Low temperature specific heat of 12442-type KCa_2Fe_4As_4F_2 single crystals
• Anisotropic physical properties and large critical current density in KCa${}_2$Fe${}_4$As${}_4$F${}_2$ single crystal
• BaTh${}_2$Fe${}_4$As${}_4$(N${}_{0.7}$O${}_{0.3}$)${}_2$: An Iron-Based Superconductor Stabilized by Inter-Block-Layer Charge Transfer
• Observation of Two-dimensional Superconductivity in an Ultrathin Iron-Arsenic Superconductor
• Mössbauer spectroscopy study of magnetic fluctuations in superconducting RbGd${}_2$Fe${}_4$As${}_4$O${}_2$
• Structural design and multiple magnetic orderings of the intergrowth compound Eu${}_2$CuMn${}_2$P${}_3$