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Self doping effect and successive magnetic transitions in superconducting Sr$_2$VFeAsO$_3$

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arxiv 1007.3980 v2 pith:6DIXIDVW submitted 2010-07-22 cond-mat.supr-con cond-mat.str-el

Guanghan Cao , Zhifeng Ma , Cao Wang , Yunlei Sun , Jinke Bao , Shuai Jiang , Yongkang Luo , Chunmu Feng
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Yi Zhou Zhi Xie Fengchun Hu Shiqiang Wei I. Nowik I. Felner Lei Zhang Zhu'an Xu Fuchun Zhang
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classification cond-mat.supr-concond-mat.str-el
keywords magneticselfsuccessivetransitiontransitionsvfeasox-rayabsorption
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abstract

We have studied a quinary Fe-based superconductor Sr$_2$VFeAsO$_3$ by the measurements of x-ray diffraction, x-ray absorption, M\"{o}ssbauer 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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