Superconductivity induced by phosphorus doping and its coexistence with ferromagnetism in EuFe${}_2$(As${}_{0.7}$P${}_{0.3}$)${}_2$

Abstract

We have studied EuFe${}_2$(As${}_{0.7}$P${}_{0.3}$)${}_2$ by the measurements of x-ray diffraction, electrical resistivity, thermopower, magnetic susceptibility, magnetoresistance and specific heat. Partial substitution of As with P results in the shrinkage of lattice, which generates chemical pressure to the system. It is found that EuFe${}_2$(As${}_{0.7}$P${}_{0.3}$)${}_2$ undergoes a superconducting transition at 26 K, followed by ferromagnetic ordering of Eu${}^{2+}$ moments at 20 K. This finding is the first observation of superconductivity stabilized by internal chemical pressure, and supplies a rare example showing coexistence of superconductivity and ferromagnetism in the ferro-arsenide family.

4 pages, 4 figures

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Cited by in corpus (4)

• Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Superconductivity in LaFeAs${}_{1-x}$P${}_x$O: effect of chemical pressures and bond covalency
• Fermi surface of SrFe${}_2$P${}_2$ determined by de Haas-van Alphen effect
• Evolution of the bulk properties, structure, magnetic order, and superconductivity with Ni doping in CaFe2-xNixAs2