paper

Superconductivity induced by phosphorus doping and its coexistence with ferromagnetism in EuFe $_{2}$ (As $_{0.7}$ P $_{0.3}$ ) $_{2}$

arXiv:0811.2390 · doi:10.1103/PhysRevLett.102.137002

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

Superconductivity induced by phosphorus doping and its coexistence with ferromagnetism in EuFe2​(As0.7​P0.3​)2​

Abstract

Superconductivity induced by phosphorus doping and its coexistence with ferromagnetism in EuFe $_{2}$ (As $_{0.7}$ P $_{0.3}$ ) $_{2}$