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19 April 2024
 
  » arxiv » 1107.4719

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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 ;
Date 24 Jul 2011
AbstractWe 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.
Source arXiv, 1107.4719
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