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Coexistence of different electronic phases in the K0.8Fe1.6Se2 superconductor: a bulk-sensitive hard x-rays spectroscopy study

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arxiv 1206.3046 v1 pith:ZWNNCQNU submitted 2012-06-14 cond-mat.supr-con

Coexistence of different electronic phases in the K0.8Fe1.6Se2 superconductor: a bulk-sensitive hard x-rays spectroscopy study

L. Simonelli , N. L. Saini , M. Moretti Sala , Y. Mizuguchi , Y. Takano , H. Takeya , T. Mizokawa , G. Monaco This is my paper
classification cond-mat.supr-con
keywords electronichighphasephasesspinstatesuperconductivityspectroscopy
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We have studied electronic and magnetic properties of the K0.8Fe1.6Se2 superconductor by x-ray absorption and emission spectroscopy. Detailed temperature dependent measurements alongwith a direct comparison with the binary FeSe system have revealed coexisting electronic phases: a majority phase with high spin 3+Fe state and a minority phase with intermediate spin 2+Fe state. The effect of high temperature annealing suggests that the compressed phase with lower spin 2+Fe state is directly related with the high Tc superconductivity in the title system. The results clearly underline glassy nature of superconductivity in the electronically inhomogeneous K0.8Fe1.6Se2, similar to the superconductivity in granular phases.

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