Study of the rare earth effects on the magnetic fluctuations in RbLn$_2$Fe$_4$As$_4$O$_2$ (Ln = Tb, Dy and Ho) by M\"ossbauer spectroscopy

TL;DR

This study uses Mössbauer spectroscopy to analyze how different rare earth elements affect magnetic fluctuations in RbLn$_2$Fe$_4$As$_4$O$_2$ superconductors, revealing variations linked to rare earth magnetic behaviors.

Contribution

It provides new insights into the influence of rare earth elements on magnetic fluctuations in RbLn$_2$Fe$_4$As$_4$O$_2$ superconductors using Mössbauer spectroscopy.

Findings

No static magnetic order observed down to 5.9 K.

Different spectral line width behaviors depending on the rare earth element.

Magnetic fluctuations at Fe sites are sensitive to rare earth magnetic moments.

Abstract

In the current work, we report the investigation of RbLn$_2$Fe$_4$As$_4$O$_2$ (Ln = Tb, Dy and Ho) and RbFe$_2$As$_2$ by $^{57}$Fe M\"ossbauer spectroscopy. Singlet pattern has been observed for all the samples indicating the absence of static magnetic ordering down to 5.9\,K on the Fe sublattice. The observed intermediate value of the isomer shift confirms the effective self charge transfer effect for the studied superconductors. Debye temperatures of these samples have been determined by the temperature dependence of the isomer shift. Most importantly, we observe different spectral line width broadening behaviors for samples with different rare earth elements, and no line width broadenings for samples Ln=Tb and Ho. These results suggest that the observed magnetic fluctuations at the Fe site might be sensitive to the magnetic behaviors of the rare earth magnetic moments.