Correlation between superconductivity and antiferromagnetism in Rb0.8Fe2−ySe2−xTex single crystals

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

doi:10.1103/PhysRevB.85.174523

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Correlation between superconductivity and antiferromagnetism in Rb0.8Fe2−ySe2−xTex single crystals

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

DOI 10.1103/PhysRevB.85.174523 · Physical Review B

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Abstract

We report experimental evidence for the connection between superconductivity and antiferromagnetism in Rb0.8Fe2−ySe2−xTex single crystals under negative chemical pressure introduced by the lattice expansion of substituting Se with isovalent Te atoms. Electrical resistance and magnetic measurements in the temperature range from 4 to 600 K demonstrate that both superconducting transition temperature (Tc) and the Neel temperature (TN) are suppressed continuously with the lattice expansion. When the Te concentration x in Rb0.8Fe2−ySe2−xTex approaches 0.4, the superconductivity is completely suppressed, and the sample behaves like a semiconductor; meanwhile, the features for antiferromagnetic transition on resistance and magnetization curves disappear. Our observation suggests that the effect of negative-pressure-induced lattice expansion can be used to tune the correlativity of superconductivity and antiferromagnetism in the studied system.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Rb0.8Fe2-ySe2-xTex Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31.4	Pressure not reported	unknown
Rb0.8Fe2-ySe2-xTex Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30.2	Pressure not reported	unknown
LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	unknown
SmFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	55	Pressure not reported	unknown