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

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 $T_{c}$ = 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 ( $μ_{0}$ d $H_{c 2}$ /d $T ∣_{T_{c}}$ = 16.5 T/K) is measured for the polycrystalline sample.

Superconductivity at 35 K by self doping in RbGd $_{2}$ Fe $_{4}$ As $_{4}$ O $_{2}$

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Superconductivity at 35 K by self doping in RbGd $_{2}$ Fe $_{4}$ As $_{4}$ O $_{2}$

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Superconductivity at 35 K by self doping in RbGd22​Fe44​As44​O22​

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Superconductivity at 35 K by self doping in RbGd22​Fe44​As44​O22​

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Superconductivity at 35 K by self doping in RbGd $_{2}$ Fe $_{4}$ As $_{4}$ O $_{2}$

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Superconductivity at 35 K by self doping in RbGd $_{2}$ Fe $_{4}$ As $_{4}$ O $_{2}$

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