超导Sr $_2$ VFeAsO $_3$的自掺杂效应和连续磁跃迁
Self doping effect and successive magnetic transitions in superconducting Sr$_2$VFeAsO$_3$
摘要：
本文对五元铁基超导体Sr $_2$ VFeAsO $_3$进行了X射线衍射、X射线吸收、穆斯堡尔谱、电阻率、磁化强度和比热的测量。这显然是未掺杂的砷氧化物被证明是自掺杂通过电子转移从V $^{3+}$离子。我们观察到VO $_2$层内连续的磁性转变：在150 K时的反铁磁转变，随后在55 K时的弱铁磁转变。基于V $^{3+}$和V $^{4+}$的混合价态，讨论了VO $_2$平面内的自旋有序.
英文摘要：
We have studied a quinary Fe-based superconductor Sr$_2$VFeAsO$_3$ by the measurements of x-ray diffraction, x-ray absorption, Mössbauer spectrum, resistivity, magnetization and specific heat. This apparently undoped oxyarsenide is shown to be self doped via electron transfer from the V$^{3+}$ ions. We observed successive magnetic transitions within the VO$_2$ layers: an antiferromagnetic transition at 150 K followed by a weak ferromagnetic transition at 55 K. The spin orderings within the VO$_2$ planes are discussed based on mixed valence of V$^{3+}$ and V$^{4+}$.
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