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arXiv · 1107.4719

Correlation between superconductivity and antiferromagnetism in Rb0.8Fe2Se2-xTex single crystals

Dachun Gu·Liling Sun·Qi Wu·Chao Zhang·Jing Guo·Peiwen Gao·Yue Wu·Xiaoli Dong·Xi Dai·Zhongxian Zhao
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Abstract

We report the first experimental evidence for the intimate connection between superconductivity and antiferromagnetism in Rb0.8Fe2Se2-xTex single crystal under negative chemical pressure by substituting Se with isovalent Te atoms. Electrical resistance measurements in the temperature range from 4 K to 550 K demonstrate that both superconducting transition temperature (Tc) and Neel temperature (TN) were suppressed continuously with the lattice expansion. When the Te concentration x in Rb0.8Fe2Se2-xTex approaches 0.3, the superconducting transition temperature Tc is completely suppressed and the sample behaves like a semiconductor, meanwhile the characteristic peak of antiferromagnetic transition on resistance curve disappears. Our observation suggests that the pressure-induced lattice expansion can be used to tune the correlativity of superconductivity and antiferromagnetism.

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Dachun Gu, Liling Sun, Qi Wu, Chao Zhang, Jing Guo, Peiwen Gao, Yue Wu, Xiaoli Dong, Xi Dai, Zhongxian Zhao. 2011-07-24. Correlation between superconductivity and antiferromagnetism in Rb0.8Fe2Se2-xTex single crystals. https://arxiv.org/abs/1107.4719

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