title: Superconductivity induced by phosphorus doping and its coexistence with ferromagnetism in EuFe2(As0.7P0.3)(2).
abstract: We have studied EuFe2(As0.7P0.3)(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 EuFe2(As0.7P0.3)(2) undergoes a superconducting transition at 26 K, followed by ferromagnetic ordering of Eu2+ moments at 20 K. This finding is the first observation of superconductivity stabilized by internal chemical pressure, and supplies a rare example showing the coexistence of superconductivity and ferromagnetism in the ferroarsenide family.
authors.affiliation: Department of Physics, Zhejiang University, Hangzhou 310027, China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Ren
authors.forename: Qian
authors.initials: Q
authors.lastname: Tao
authors.forename: Shuai
authors.initials: S
authors.lastname: Jiang
authors.forename: Chunmu
authors.initials: C
authors.lastname: Feng
authors.forename: Cao
authors.initials: C
authors.lastname: Wang
authors.forename: Jianhui
authors.initials: J
authors.lastname: Dai
authors.forename: Guanghan
authors.initials: G
authors.lastname: Cao
authors.forename: Zhu'an
authors.initials: Z
authors.lastname: Xu