Abstract
We have performed zero-field muon spin relaxation measurements in single-crystalline samples of superconducting (SC) RbxFe2−ySe2 (Tc = 29 K) and non-SC RbxFe2−ySe2 in order to elucidate whether there is difference in the magnetic states between SC and non-SC systems. In the SC sample, no temperature dependence of the muon spin polarization was observed at temperatures below 40 K while a decrease in the spin polarization was observed in the non-SC sample with decreasing temperature. This suggests that a new magnetically ordered state seems to develop in the non-SC sample.
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