Development of a ferromagnetic component in the superconducting state of Fe-excess Fe1.12 Te1-x Sex by electronic charge redistribution

Wen Hsien Li, Sunil K. Karna, Han Hsu, Chi Yen Li, Chi Hung Lee, Raman Sankar, Fang Cheng Chou

研究成果: 雜誌貢獻期刊論文同行評審

1 引文 斯高帕斯(Scopus)

摘要

The general picture established so far for the links between superconductivity and magnetic ordering in iron chalcogenide Fe1+y (Te1-x Sex) is that the substitution of Se for Te directly drives the system from the antiferromagnetic end into the superconducting regime. Here, we report on the observation of a ferromagnetic component that developed together with the superconducting transition in Fe-excess Fe1.12 Te1-x Sex crystals using neutron and x-ray diffractions, resistivity, magnetic susceptibility and magnetization measurements. The superconducting transition is accompanied by a negative thermal expansion of the crystalline unit cell and an electronic charge redistribution, where a small portion of the electronic charge flows from around the Fe sites toward the Te/Se sites. First-principles calculations show consistent results, revealing that the excess Fe ions play a more significant role in affecting the magnetic property in the superconducting state than in the normal state and the occurrence of an electronic charge redistribution through the superconducting transition.

原文???core.languages.en_GB???
文章編號10951
期刊Scientific Reports
5
DOIs
出版狀態已出版 - 16 6月 2015

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