Abstract
We successfully synthesized two new compounds, RbFeS and CsFeS, which are isostructural with a KFeSe superconductor. We systematically investigated the resistivity, magnetism, and thermoelectric power of FeS (, Rb, and Cs) single crystals. High-temperature resistivity and magnetic measurements show anomalies above 500 K depending on which are similar to FeSe. A discrepancy between zero-field-cooling (ZFC) and field-cooling (FC) curves was observed in KFeS and RbFeS, whereas it disappears in CsFeS. Our results indicate similar magnetism between FeS and FeSe at high temperature.
- Received 17 November 2011
DOI:https://doi.org/10.1103/PhysRevB.85.054506
©2012 American Physical Society