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; X. H. Chen

doi:10.1103/PhysRevB.85.054506

paper

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

arXiv:1201.1709 · doi:10.1103/PhysRevB.85.054506

Abstract

We successfully synthesized two new compounds Rb $_{x}$ Fe $_{2 - y}$ S $_{2}$ and Cs $_{x}$ Fe $_{2 - y}$ S $_{2}$ which were isostructural with 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 $_{2}$ . Discrepancy between ZFC and FC curves was observed in K $_{x}$ Fe $_{2 - y}$ S $_{2}$ and Rb $_{x}$ Fe $_{2 - y}$ S $_{2}$ , while it disappears in Cs $_{x}$ Fe $_{2 - y}$ S $_{2}$ . Our results indicate the similar magnetism between $A_{x}$ Fe $_{2 - y}$ S $_{2}$ and $A_{x}$ Fe $_{2 - y}$ Se $_{2}$ at high temperature.

Physical properties of Ax​Fe2−y​S2​ (A=K, Rb and Cs) single crystals

Abstract

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