磷掺杂EuFe $_{2}$（As $_{0.7}$ P $_{0.3}$）$_{2}$的超导电性及其与铁磁性的共存
Superconductivity induced by phosphorus doping and its coexistence with ferromagnetism in EuFe$_{2}$(As$_{0.7}$P$_{0.3}$)$_{2}$
摘要：
本文通过X射线衍射、电阻率、热电势、磁化率、磁电阻和比热等测试手段对EuFe $_{2}$（As $_{0.7}$ P $_{0.3}$）$_{2}$进行了研究。P部分取代As导致晶格收缩，对体系产生化学压力。结果表明，EuFe $_{2}$（As $_{0.7}$ P $_{0.3}$）$_{2}$在26 K发生超导转变，随后在20 K发生Eu $^{2+}$磁矩的铁磁有序化.这一发现是第一次观察到内部化学压力稳定的超导性，并提供了一个罕见的例子，表明在砷化铁家族中超导性和铁磁性共存。
英文摘要：
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.
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