Physical properties of ${A}_{x}$Fe${}_{2\ensuremath{-}y}$S${}_{2}$ ($A=\text{K}$, Rb, and Cs) single crystals

Physical properties of $A_{x}$ Fe $_{2 - y}$ S $_{2}$ ( $A = K$ , Rb, and Cs) single crystals

J. J. Ying, Z. J. Xiang, Z. Y. Li, Y. J. Yan, M. Zhang, A. F. Wang, X. G. Luo, and X. H. Chen

Phys. Rev. B 85, 054506 – Published 16 February 2012

Abstract

We successfully synthesized two new compounds, Rb $_{x}$ Fe $_{2 - y}$ S $_{2}$ and Cs $_{x}$ Fe $_{2 - y}$ S $_{2}$ , which are isostructural with a K $_{x}$ Fe $_{2 - y}$ Se $_{2}$ superconductor. We systematically investigated the resistivity, magnetism, and thermoelectric power of $A_{x}$ Fe $_{2 - y}$ S $_{2}$ ( $A = K$ , Rb, and Cs) single crystals. High-temperature resistivity and magnetic measurements show anomalies above 500 K depending on $A$ which are similar to $A_{x}$ Fe $_{2 - y}$ Se $_{2}$ . A discrepancy between zero-field-cooling (ZFC) and field-cooling (FC) curves was observed in K $_{x}$ Fe $_{2 - y}$ S $_{2}$ and Rb $_{x}$ Fe $_{2 - y}$ S $_{2}$ , whereas it disappears in Cs $_{x}$ Fe $_{2 - y}$ S $_{2}$ . Our results indicate similar magnetism between $A_{x}$ Fe $_{2 - y}$ S $_{2}$ and $A_{x}$ Fe $_{2 - y}$ Se $_{2}$ at high temperature.

Received 17 November 2011

DOI:https://doi.org/10.1103/PhysRevB.85.054506

Authors & Affiliations

J. J. Ying, Z. J. Xiang, Z. Y. Li, Y. J. Yan, M. Zhang, A. F. Wang, X. G. Luo, and X. H. Chen^*

Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China

^*Corresponding author: chenxh@ustc.edu.cn

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Vol. 85, Iss. 5 — 1 February 2012

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Physical Review B

covering condensed matter and materials physics

Physical properties of $A_{x}$ Fe $_{2 - y}$ S $_{2}$ ( $A = K$ , Rb, and Cs) single crystals

J. J. Ying, Z. J. Xiang, Z. Y. Li, Y. J. Yan, M. Zhang, A. F. Wang, X. G. Luo, and X. H. Chen

Phys. Rev. B 85, 054506 – Published 16 February 2012

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Physical Review B

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Physical properties of AxFe2−yS2 (A=K, Rb, and Cs) single crystals

J. J. Ying, Z. J. Xiang, Z. Y. Li, Y. J. Yan, M. Zhang, A. F. Wang, X. G. Luo, and X. H. Chen

Phys. Rev. B 85, 054506 – Published 16 February 2012

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Physical properties of $A_{x}$ Fe $_{2 - y}$ S $_{2}$ ( $A = K$ , Rb, and Cs) single crystals